View WM9701_51919.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

WM9701A Low Power AC'97 Multimedia Audio Codec
Production Data, January 2001, Rev 3.2
DESCRIPTION
The WM9701A is a high-quality stereo audio codec compliant with the Intel AC'97 Rev 1.03 specification. Forming the analogue component PC audio solution, it performs full-duplex 18-bit codec functions at 48 ksamples/s and offers excellent audio quality with high SNR. In addition, the WM9701A provides a comprehensive analogue mixer with 4 sets of stereo inputs, plus phone, 2 microphone, and PC-beep inputs. On-chip reference circuits generate the necessary bias voltages for the device, and a 5-pin digital bidirectional serial interface allows transfer of control data and DAC and ADC words to and from the AC'97 controller. The WM9701A is particularly suited to low power applications such as notebook PCs.
FEATURES
* * * * * * * * 3.3V or 5V operation 18-bit stereo codec S/N ratio > 95dB Multiple stereo input mixer Mono and stereo volume control 48-pin TQFP package Power management features Very low standby power
APPLICATIONS
* * * Notebook PC PC sound cards Motherboards
BLOCK DIAGRAM
VOL/ MUTE VOL/ MUTE
VOL/ MUTE
(35,36) LINEOUT
KEY: MONO STEREO VOL/ MUTE
MUX
VOL/ MUTE
(37) MONOOUT
STEREO DAC
VOL/ MUTE VOL/ MUTE VOL/ MUTE VOL/ MUTE VOL/ MUTE
(6) BITCLK
WM9701A
(10) SYNC SERIAL I/F (8) SDATAIN (5) SDATAOUT (11) RESETB
CD (18,20) LINEIN (23,24) VIDEO (16,17) AUX (14,15) PHONE (13) PCBEEP (12) MIC[1] (21) MUX MIC[2] (22)
VOL RECORD MUX AND MUTE 0dB/ 20dB
STEREO ADC
OSC
(2) XTLIN (3) XTLOUT
WOLFSON MICROELECTRONICS LTD.
Lutton Court, Bernard Terrace, Edinburgh, EH8 9NX, UK Tel: +44 (0) 131 667 9386 Fax: +44 (0) 131 667 5176 Email: sales@wolfson.co.uk http://www.wolfson.co.uk
Production Data datasheets contain final specifications current on publication date. Supply of products conforms to Wolfson Microelectronics' Terms and Conditions.
2001 Wolfson Microelectronics Ltd.
WM9701A PIN CONFIGURATION
MONOOUT
Production Data
ORDERING INFORMATION
DEVICE WM9701ACFT/V
AVDD2
TEMP. RANGE 0o to 70oC
PACKAGE 48-pin TQFP
AVSS2
NC
NC
NC
NC
NC
NC
NC
NC
DVDD1 XTLIN XTLOUT DVSS1 SDATAOUT BITCLK DVSS2 SDATIN DVDD2 SYNC RESETB PCBEEP
1 2 3 4 5 6 7 8 9
48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26
NC
LINEOUTR LINEOUTL NC NC CAP2 NC NC NC VREFOUT VREF AVSS1 AVDD1
10 11 12
25 13 14 15 16 17 18 19 20 21 22 23 24
AUXR
AUXL
CDGND
CDR
CDL
MIC1
VIDEOR
MIC2
ABSOLUTE MAXIMUM RATINGS
Absolute Maximum Ratings are stress ratings only. Permanent damage to the device may be caused by continuously operating at or beyond these limits. Device functional operating limits and guaranteed performance specifications are given under Electrical Characteristics at the test conditions specified ESD Sensitive Device. This device is manufactured on a CMOS process. It is therefore generically susceptible to damage from excessive static voltages. Proper ESD precautions must be taken during handling and storage of this device. As per specifications IPC/JEDEC J-STD-020A and JEDEC A113-B, this product requires specific storage conditions prior to surface mount assembly. It has been classified as having a Moisture Sensitivity Level of 2 and as such will be supplied in vacuum-sealed moisture barrier bags. CONDITION Digital supply voltage Analogue supply voltage Voltage range digital inputs Voltage range analogue inputs Operating temperature range, TA Storage temperature Package body temperature (soldering 10 seconds) Package body temperature (soldering 2 minutes) MIN -0.3V -0.3V DVSS -0.3V AVSS -0.3V 0C -65oC
o
LINEINR
PHONE
VIDEOL
LINEINL
MAX +7V +7V DVDD +0.3V AVDD +0.3V +70oC +150oC +240oC +183oC
Note: 1. The digital supply voltage (DVDD) must always be less than or equal to the analogue supply voltage (AVDD).
WOLFSON MICROELECTRONICS LTD.
PD Rev 3.2 January 2001 2
Production Data
WM9701A
RECOMMENDED OPERATING CONDITIONS
PARAMETER Digital supply range Analogue supply range Digital ground Analogue ground Difference DVSS to AVSS Analogue supply current Digital supply current Standby supply current (all PRs set) Analogue supply current Digital supply current Standby supply current (all PRs set) DVDD, AVDD = 5V DVDD, AVDD = 5V DVDD, AVDD = 5V DVDD, AVDD = 3.3V DVDD, AVDD = 3.3V DVDD, AVDD = 3.3V SYMBOL DVDD1, DVDD2 AVDD1, AVDD2 DVSS1, DVSS2 AVSS1, AVSS2 -0.3 TEST CONDITIONS Note 1 Note 1 MIN -10% -10% TYP 3.3 to 5.0 3.3 to 5.0 0 0 0 25 10 30 15 6 20 +0.3 MAX +10% +10% UNIT V V V V V mA mA A mA mA A
Note: 1. Both supplies should be powered on and off at the same time.
ELECTRICAL CHARACTERISTICS
Test Conditions: AVDD = 5V, GND = 0V, DVDD = 3.3V, GND = 0V, TA = 0oC to +70oC, unless otherwise stated. PARAMETER Input LOW level Input HIGH level Output LOW Output HIGH Input level Output level Reference Levels Reference input/output CAP2 impedance Mixer reference MIC reference MIDBUFF current sink (pins VREF and VREFOUT) MIDBUFF current source (pins VREF and VREFOUT) MIDBUFF current source (pins VREF and VREFOUT) VREF VREFOUT AVDD = 5V AVDD = 5V AVDD = 3.3V -5 5 CAP2 2/5 AVDD AVDD/2 75 Buffered CAP2 Buffered CAP2 -15 15 5 3/5 AVDD V kohms V V mA mA mA SYMBOL VIL VIH VOL VOH Minimum input impedance = 10k Into 10kohm load 0.9 VDD AVSS -100mV AVSS +100mV AVDD +100mV AVDD -100mV TEST CONDITIONS MIN AVSS -0.3 2.2 TYP MAX 0.8 AVDD +0.3 0.1 VDD UNIT V V V V V V
Digital Logic Levels (DVDD = 3.3 or 5.0V)
Analogue I/O Levels (Input Signals on any Inputs, Outputs on LINEOUT L, R and MONO)
Near rail to rail
WOLFSON MICROELECTRONICS LTD.
PD Rev 3.2 January 2001 3
WM9701A
Test Conditions: AVDD = 5V, GND = 0V, DVDD = 3.3V, GND = 0V, TA = 0oC to +70oC, unless otherwise stated. DAC Circuit Specifications 48kHz Sampling SNR A-weighted (Note 1) Full scale output voltage THD Frequency response Transition band Stop band Out of band rejection Spurious tone reduction PSRR ADC Circuit Specifications 48kHz Sampling SNR A-weighted (Note 1) ADC input for full scale output AVDD = 5V AVDD = 3.3V VREF = 2.5V, AVDD = 5V VREF = 1.65V, AVDD = 3.3V -6dBV input 75 92 90 1.0 0.66 74 20 19,200 28,800 -74 (0.2%) 20 to 20kHz AVDD = 5V AVDD = 3.3V AVDD = 5V AVDD = 3.3V AVSS 85 90 40 95 93 95 93 1.0 0.66 Maximum output voltage on LINEOUT THD Frequency response (+/-1dB) Input impedance (CD inputs) Input impedance (other mixer inputs) Input impedance MIC inputs PSRR Clock Frequency Range Crystal clock BIT_CLK frequency SYNC frequency 24.576 12.288 48.0 At any gain At max gain At 0db gain At max gain At 0db gain 20 to 20kHz 10 0dBV input -74 (0.2%) 20 10 10 15 20 100 80 15 40 1.0 -92 90 20 to 20kHz AVDD = 5V AVDD = 3.3V VREF = 2.5V VREF = 1.65V -3dBFS input 74 (0.2%) 20 19,200 28,800 -40 -100 46 85 96 93 1.0 0.66 90
Production Data
dB dB Vrms Vrms dB 19,200 28,800 Hz Hz Hz dB dB dB dB dB Vrms Vrms dB 19,200 28,800 Hz Hz Hz dB dB dB dB dB dB AVDD Vrms Vrms dB 20,000 Hz kohm kohm kohm kohm kohm dB MHz MHz kHz
THD Frequency response Transition band Stop band Stop band rejection PSRR Mixer Circuit Specifications 48kHz Sampling SNR CD path A-weighted (Note 1) SNR Other paths A-weighted (Note 1) Maximum input voltage
Note: 1. SNR is the ratio of 0dB full scale signal level to output level with no signal present, A-weighted and 20 - 20kHz bandwidth.
WOLFSON MICROELECTRONICS LTD.
PD Rev 3.2 January 2001 4
Production Data
WM9701A
SERIAL INTERFACE
Test Conditions: AVDD = 5V, GND = 0V, DVDD = 3.3V, GND = 0V, TA = 0oC to +70oC, unless otherwise stated. All measurements are taken at 10% to 90% VDD, unless otherwise stated. All the following timing information is guaranteed, not tested.
AC-LINK LOW POWER MODE
SLOT 1 SYNC
SLOT 2
BIT_CLK
SDATA_OUT
WRITE TO 0X20
DATA PR4
DON'T CARE
tS2_PDOWN SDATA_IN
Figure 1 AC-Link Power down Timing PARAMETER End of slot 2 to BIT_CLK SDATA_IN low SYMBOL tS2_PDOWN MIN TYP MAX 1.0 UNIT s
COLD RESET
tRST_LOW RESETB tRST2CLK
BIT_CLK
Figure 2 Cold Reset Timing PARAMETER RESETB active low pulse width RESETB inactive to BIT_CLK startup delay SYMBOL tRST_LOW tRST2CLK MIN 1.0 162.8 TYP MAX UNIT s ns
WOLFSON MICROELECTRONICS LTD.
PD Rev 3.2 January 2001 5
WM9701A
WARM RESET
tSYNC_HIGH SYNC tSYNC2CLK
Production Data
BIT_CLK
Figure 3 Warm Reset Timing PARAMETER SYNC active high pulse width SYNC inactive to BIT_CLK startup delay SYMBOL tSYNC_HIGH tSYNC2CLK 162.4 MIN TYP 1.3 MAX UNIT s ns
CLOCK SPECIFICATIONS
tCLK_HIGH BIT_CLK tCLK_PERIOD tSYNC_HIGH SYNC tSYNC_PERIOD tSYNC_LOW tCLK_LOW
Figure 4 Clock Specifications (50pF External Load) Note: Worst case duty cycle restricted to 40/60. PARAMETER BIT_CLK frequency BIT_CLK period BIT_CLK output jitter BIT_CLK high pulse width (Note 1 on page 4) BIT_CLK low pulse width (Note 1 on page 4) SYNC frequency SYNC period SYNC high pulse width SYNC low pulse width tSYNC_PERIOD tSYNC_HIGH tSYNC_LOW tCLK_HIGH tCLK_LOW 32.56 32.56 40.7 40.7 48.0 20.8 1.3 19.5 tCLK_PERIOD SYMBOL MIN TYP 12.288 81.4 750 48.84 48.84 MAX UNIT MHz ns ps ns ns kHz s s s
WOLFSON MICROELECTRONICS LTD.
PD Rev 3.2 January 2001 6
Production Data
WM9701A
DATA SETUP AND HOLD (50PF EXTERNAL LOAD)
tSETU
P
BIT_CLK tHOL SYNC/ SDATA_OUT /SDATA_IN
D
Figure 5 Data Setup and Hold (50pF External Load) Note: Setup and hold time parameters for SDATA_IN are with respect to AC'97 Controller. PARAMETER Setup to falling edge of BIT_CLK Hold from falling edge of BIT_CLK SYMBOL tSETUP tHOLD MIN 15.0 5.0 TYP MAX UNIT ns ns
SIGNAL RISE AND FALL TIMES
triseCLK BIT_CLK triseSYNC SYNC triseDIN SDATA_IN triseDOUT SDATA_OUT tfallDOUT tfallDIN tfallSYNC tfallCLK
Figure 6 Signal Rise and Fall Times (50pF external load) PARAMETER BIT_CLK rise time BIT_CLK fall time SYNC rise time SYNC fall time SDATA_IN rise time SDATA_IN fall time SDATA_OUT rise time SDATA_OUT fall time SYMBOL triseCLK tfallCLK triseSYNC tfallSYNC triseDIN triseDIN triseDOUT tfallDOUT MIN 2 2 2 2 2 2 2 2 TYP MAX 6 6 6 6 6 6 6 6 UNIT ns ns ns ns ns ns ns ns
WOLFSON MICROELECTRONICS LTD.
PD Rev 3.2 January 2001 7
WM9701A PIN DESCRIPTION
PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 NAME DVDD1 XTLIN XTLOUT DVSS1 SDATAOUT BITCLK DVSS2 SDATAIN DVDD2 SYNC RESETB PCBEEP PHONE AUXL AUXR VIDEOL VIDEOR CDL CDGND CDR MIC1 MIC2 LINEINL LINEINR AVDD1 AVSS1 VREF VREFOUT NC NC NC CAP2 NC NC LINEOUTL LINEOUTR MONOOUT AVDD2 NC NC NC AVSS2 NC NC NC NC NC NC Supply Analogue output Analogue output Analogue output Supply Analogue input Supply Digital input Digital output Supply Digital input Digital output Supply Digital output Supply Digital input Digital input Analogue input Analogue input Analogue input Analogue input Analogue input Analogue input Analogue input Analogue input Analogue input Analogue input Analogue input Analogue input Analogue input Supply Supply Analogue output Analogue output TYPE Digital positive supply DESCRIPTION
Production Data
Clock crystal connection or clock input (XTAL not used) Clock crystal connection Digital ground supply Serial data input Serial interface clock output to AC'97 controller Digital ground supply Serial data output to AC'97 controller Digital positive supply Serial interface sync pulse from AC'97 controller NOT reset input (active low, resets registers) Mixer input, typically for PCBEEP signal Mixer input, typically for PHONE signal Mixer input, typically for AUX signal Mixer input, typically for AUX signal Mixer input, typically for VIDEO signal Mixer input, typically for VIDEO signal Mixer input, typically for CD signal CD input common mode reference (ground) Mixer input, typically for CD signal Mixer input with extra gain if required Mixer input with extra gain if required Mixer input, typically for LINE signal Mixer input, typically for LINE signal Analogue positive supply Analogue ground supply, chip substrate Buffered CAP2, used as MIXER reference Reference for microphones; buffered CAP2 No internal connection No internal connection No internal connection Reference input/output; pulls to midrail if not driven No internal connection No internal connection Main analogue output for left channel Main analogue output for right channel Main mono output Analogue positive supply No internal connection No internal connection No internal connection Analogue ground supply, chip substrate No internal connection No internal connection No internal connection No internal connection No internal connection No internal connection
WOLFSON MICROELECTRONICS LTD.
PD Rev 3.2 January 2001 8
Production Data
WM9701A
DEVICE DESCRIPTION
INTRODUCTION
WM9701A is fully compatible with Rev 1.03 of the AC'97 specification. WM9701A comprises a stereo 18-bit Codec, (that is, 2 ADCs and 2 DACs) plus a comprehensive analogue mixer with 4 sets of stereo inputs, plus phone, 2 microphone, and PC-beep inputs. Additionally, on-chip reference generation circuits generate the necessary bias voltages for the device, and a bi-directional serial interface allows transfer of control data and DAC and ADC words to and from the AC'97 controller. WM9701A supports 18-bit resolution within the DAC and ADC functions, but the AC'97 Codec serial interface specification allows any word length up to 20-bits to be written to, or read from, the AC'97 Codec. These words are MSB justified, and any LSBs not used will simply default to 0. Normally it is anticipated that 16-bit words will be used in most PC type systems. Therefore, for the DAC, 16-bit words will be downloaded into the Codec from the controller, along with padding of 0s to make the 16-bit word up to 20-bit length. In this case, WM9701A will process the 16-bit word along with 0 padding bits in the 2 LSB locations (to make 18-bit). At the ADC output, WM9701A will provide an 18-bit word, again with 0s in the two LSB locations (20-bit). The AC'97 controller will then ignore the 4 LSBs of the 20-bit word. When WM9701A is interrogated, it responds indicating it is an 18-bit device. However, a serial register controlled mode is available to allow these flags to be changed, making the device appear to be a 16-bit device. The WM9701A has the ADC and DAC functions implemented using over sampled, or `sigma-delta' converters, and uses on-chip digital filters to convert these 1-bit signals to and from the 48ks/s 16/18-bit PCM words that the AC'97 controller requires. The digital parts of the device are powered separately from the analogue to optimise performance, and 3.3V digital and 5V analogue supplies may be used on the same device to further optimise performance. Digital levels are 5V tolerant when the analogue supplies are 5V, so WM9701A may be connected to a controller running on 5V supplies, but using 3.3V for the digital section of WM9701A. WM9701A is also capable of operating with a 3.3V supply only (digital and analogue). An internally generated mid-rail reference is provided at pin CAP2 which is used as the chip reference. This pin should be heavily decoupled. The WM9701A is not limited to PC-only applications. The ability to power down sections of the device selectively, and the option to choose alternative master clock, and hence sample rates, means that many alternative applications in areas such as telecoms, may be anticipated. Internal connection of Pc-beep to the outputs in the case where the device is reset is supported.
CONTROL INTERFACE
A digital interface to control and transfer to and from the WM9701A has been provided. This serial interface is compatible with the Intel AC'97 specification as illustrated in the `System Diagram'. The main control interface functions are: * * * Control of analogue gain and signal paths through the mixer. Bi-directional transfer of ADC and DAC words to and from AC'97 controller. Selection of power down modes.
AC-LINK DIGITAL SERIAL INTERFACE PROTOCOL
WM9701A incorporates a 5 pin digital serial interface that links it to the AC'97 controller. AC-link is a bi-directional, fixed rate, serial PCM digital stream. It handles multiple input, and output audio streams, as well as control register accesses employing a time division multiplexed (TDM) scheme. The AC-link architecture divides each audio frame into 12 outgoing and 12 incoming data streams, each with 20-bit sample resolution. With a minimum required DAC and ADC resolution of 16-bits, AC'97 may also be implemented with 18 or 20-bit DAC/ADC resolution, given the headroom that the AC-link architecture provides. WM9701A provides support for 18-bit operation.
WOLFSON MICROELECTRONICS LTD.
PD Rev 3.2 January 2001 9
WM9701A
Production Data
SLOT #
0
1
2
3
4
5
6
7
8
9
10
11
12
SYNC
OUTGOING STREAMS
TAG
CMD ADR
CMD DATA
PCM LEFT
PCM RIGHT
OPT MDM CDC
RSRVD
RSRVD
RSRVD
RSRVD
RSRVD
RSRVD
RSRVD
INCOMING STREAMS
TAG
CMD ADR
CMD DATA
PCM LEFT
PCM RIGHT
OPT MDM CDC
RSRVD
RSRVD
RSRVD
RSRVD
RSRVD
RSRVD
RSRVD
DATA PHASE TAG PHASE
Figure 7 AC'97 Standard Bi-directional Audio Frame
TAG PHASE
DATA PHASE 20.8S (48kHz)
SYNC
12.288MHz 81.4nS
BIT_CLK
SDATA_OUT
OUT
VALID FRAME
SLOT(1)
SLOT(2)
SLOT(12)
'0'
'0'
'0'
19 SLOT (1)
0
19 SLOT (2)
0
19 SLOT (3)
0
19 SLOT (12)
0
END OF PREVIOUS AUDIO FRAME
TIME SLOT 'VALID' BITS ('1' = TIME SLOT CONTAINS VALID PCM DATA)
Figure 8 AC-link Audio Output Frame The data streams currently defined by the AC'97 specification include: PCM playback - 2 output slots PCM record data - 2 input slots Control 2 output slots Status 2 input slots Optional modem line Codec output - 1 output slot Optional modem line Codec input - 1 input slot Optional dedicated microphone input 1 input slot 2 channel composite PCM output stream 2 channel composite PCM input stream Control register write port Control register read port Modem line Codec DAC input stream (Not supported by WM9701A) Modem line Codec ADC output stream (Not supported by WM9701A) Dedicated microphone input stream in support of stereo AEC, and/or other voice applications. (Not supported by WM9701A)
Synchronisation of all AC-link data transactions is signalled by the WM9701A controller. WM9701A drives the serial bit clock onto AC-link, which the AC'97 controller then qualifies with a synchronisation signal to construct audio frames. SYNC fixed at 48 kHz, is derived by dividing down the serial clock (BIT_CLK). BIT_CLK, fixed at 12.288 MHz, provides the necessary clocking granularity to support 12, 20-bit outgoing and incoming time slots. AC-link serial data is transitioned on each rising edge of BIT_CLK. The receiver of AClink data, (WM9701A for outgoing data and the AC'97 controller for incoming data), samples each serial bit on the falling edges of BIT_CLK. The AC-link protocol provides for a special 16-bit time slot (slot 0) wherein each bit conveys a valid tag for its corresponding time slot within the current audio frame. A 1 in a given bit position of slot 0 indicates that the corresponding time slot within the current audio frame has been assigned to a data stream, and contains valid data. If a slot is "tagged" invalid, it is the responsibility of the source of the data, (WM9701A for the input stream, AC'97 controller for the output stream); to stuff all bit positions with 0s during that slot's active time. WOLFSON MICROELECTRONICS LTD. PD Rev 3.2 January 2001 10
Production Data
WM9701A
SYNC remains high for a total duration of 16 BIT CLKs at the beginning of each audio frame. The portion of the audio frame where SYNC is high is defined as the "Tag Phase". The remainder of the audio frame where SYNC is low is defined as the "Data Phase". Additionally, for power savings, all clock, sync, and data signals can be halted. This requires that WM9701A be implemented as a static design to allow its register contents to remain intact when entering a power savings mode.
AC-LINK AUDIO OUTPUT FRAME (SDATA_OUT)
The audio output frame data streams correspond to the multiplexed bundles of all digital output data targeting WM9701A's DAC inputs, and control registers. As briefly mentioned earlier, each audio output frame supports up to 12, 20-bit outgoing data time slots. Slot 0 is a special reserved time slot containing 16-bits, which are used for AC-link protocol infrastructure. Within slot 0 the first bit is a global bit (SDATA_OUT slot 0, bit 15) which flags the validity for the entire audio frame. If the "Valid Frame" bit is a 1, this indicates that the current audio frame contains at least one time slot of valid data. The next 12-bit positions sampled by WM9701A indicate which of the corresponding 12 time slots contain valid data. In this way data streams of differing sample rates can be transmitted across AC-link at its fixed 48 kHz audio frame rate. Figure 8 illustrates the time slot based AC-link protocol.
WM9701A SAMPLES SYNC ASSERTION
SYNC BIT_CLK
WM9701A SAMPLES FIRST SDATA_OUT BIT OF FRAME HERE
SDATA_OUT
VALID FRAME
SLOT (1)
SLOT (2)
END OF PREVIOUS AUDIO FRAME
Figure 9 Start of an Audio Output Frame A new audio output frame begins with a low to high transition of SYNC as shown in Figure 9. SYNC is synchronous to the rising edge of BIT_CLK. On the immediately following falling edge of BIT_CLK, WM9701A samples the assertion of SYNC. This falling edge marks the time when both sides of AClink are aware of the start of a new audio frame. On the next rising edge of BIT_CLK, AC'97 transitions SDATA_OUT into the first bit position of slot 0 ("Valid Frame" bit). Each new bit position is presented to AC-link on a rising edge of BIT_CLK, and subsequently sampled by the WM9701A on the following falling edge of BIT_CLK. This sequence ensures that data transitions and subsequent sample points for both incoming and outgoing data streams are time aligned. Baseline AC'97 specified audio functionality MUST ALWAYS sample rate convert to and from a fixed 48 ks/s on the AC'97 controller. This requirement is necessary to ensure that interoperability between the AC'97 controller and WM9701A, among other things, can be guaranteed by definition for baseline specified AC'97 features. SDATA_OUT's composite stream is MSB justified (MSB first) with all non-valid slot bit positions stuffed with 0s by the AC'97 controller. In the event that there are less than 20 valid bits within an assigned and valid time slot, the AC'97 controller always stuffs all trailing non-valid bit positions of the 20-bit slot with 0s. As an example, consider an 8-bit sample stream that is being played out to one of WM9701A's DACs. The first 8-bit positions are presented to the DAC (MSB justified) followed by the next 12-bitpositions, which are stuffed with 0s by the AC'97 controller. This ensures that regardless of the resolution of the implemented DAC (16, 18 or 20-bit), no DC biasing will be introduced by the least significant bits. When mono audio sample streams are output from the AC'97 controller, it is necessary that BOTH left and right sample stream time slots be filled with the same data.
WOLFSON MICROELECTRONICS LTD.
PD Rev 3.2 January 2001 11
WM9701A
SLOT 1: COMMAND ADDRESS PORT
Production Data
The command port is used to control features, and monitor status for WM9701A functions including, but not limited to, mixer settings, and power management (refer to the register section). The control interface architecture supports up to 64, 16-bit read/write registers, addressable on even byte boundaries. Only the even registers (00h, 02h, etc.) are valid, odd register (01h, 03h, etc.) accesses are discouraged (if supported they should default to the preceding even byte boundary - i.e. a read to 01h will return the 16-bit contents of 00h. WM9701A's control register file is nonetheless readable as well as writeable to provide more robust testability. Audio output frame slot 1 communicates control register address, and read/write command information to WM9701A.
TAG PHASE
DATA PHASE 20.8S (48kHz)
SYNC
12.288MHz 81.4nS
BIT_CLK
SDATA_IN
CODEC READY
SLOT(1)
SLOT(2)
SLOT(12)
'0'
'0'
'0'
19 SLOT (1)
0
19 SLOT (2)
0
19 SLOT (3)
0
19 SLOT (12)
0
END OF PREVIOUS AUDIO FRAME
TIME SLOT 'VALID' BITS ('1' = TIME SLOT CONTAINS VALID PCM DATA)
Figure 10 AC-link Audio Input Frame
COMMAND ADDRESS PORT BIT ASSIGNMENTS
Bit(19) Bit(18:12) Bit(11:0) Read/write command (1 = read, 0 = write) Control register index (64 16-bit locations, addressed on even byte boundaries) Reserved (stuffed with 0s)
The first bit (MSB) sampled by WM9701A indicates whether the current control transaction is a read or write operation. The following 7 bit positions communicate the targeted control register address. The trailing 12 bit positions within the slot are reserved and must be stuffed with 0s by the AC'97 controller.
SLOT 2: COMMAND DATA PORT
The command data port is used to deliver 16-bit control register write data in the event that the current command port operation is a write cycle. (As indicated by slot 1, bit 19) Bit(19:4) Bit(3:0) Control register write data (stuffed with 0s if current operation is a read) Reserved (stuffed with 0s)
If the current command port operation is a read then the entire time slot must be stuffed with 0s by the AC'97 controller.
SLOT 3: PCM PLAYBACK LEFT CHANNEL
Audio output frame slot 3 is the composite digital audio left playback stream. In a typical `Games Compatible' PC this slot is composed of standard PCM (.wav) output samples digitally mixed (on the AC'97 controller or host processor) with music synthesis output samples. If a sample stream of resolution less than 20-bits is transferred, the AC'97 controller must stuff all trailing non-valid bit positions within this time slot with 0s.
SLOT 4: PCM PLAYBACK RIGHT CHANNEL
Audio output frame slot 4 is the composite digital audio right playback stream. In a typical `Games Compatible' PC this slot is composed of standard PCM (.wav) output samples digitally mixed (on the AC'97 controller or host processor) with music synthesis output samples.
WOLFSON MICROELECTRONICS LTD.
PD Rev 3.2 January 2001 12
Production Data
WM9701A
If a sample stream of resolution less than 20-bits is transferred, the AC'97 controller must stuff all trailing non-valid bit positions within this time slot with 0s.
SLOT 5: OPTIONAL MODEM LINE CODEC
Audio output frame slot 5 contains the MSB justified modem DAC input data. This optional AC'97 feature is not supported in WM9701A, and if data is written to this location it is ignored. This may be determined by the AC'97 controller interrogating the WM9701A Vendor ID registers.
SLOTS 6-12: RESERVED
Audio output frame slots 6-12 are reserved for future use and are always stuffed with 0s by the AC'97 controller.
AC-LINK AUDIO INPUT FRAME (SDATA_IN)
The audio input frame data streams correspond to the multiplexed bundles of all digital input data targeting the AC'97 controller. As is the case for audio output frame, each AC-link audio input frame consists of 12, 20-bit time slots. Slot 0 is a special reserved time slot containing 16-bits, which are used for AC-link protocol infrastructure. Within slot 0 the first bit is a global bit (SDATA_IN slot 0, bit 15) which flags whether WM9701A is in the "Codec Ready" state or not. If the "Codec Ready" bit is a 0, this indicates that WM9701A is not ready for normal operation. This condition is normal following the desertion of power on reset for example, while WM9701A's voltage references settle. When the AC-link "Codec Ready" indicator bit is a 1 it indicates that the AC-link and WM9701A control and status registers are in a fully operational state. The AC'97 controller must further probe the power down Control/Status Register to determine exactly which subsections, if any, are ready. Prior to any attempts at putting WM9701A into operation the AC'97 controller should poll the first bit in the audio input frame (SDATA_IN slot 0, bit 15) for an indication that WM9701A has gone "Codec Ready". Once WM9701A is sampled "Codec Ready" then the next 12 bit positions sampled by the AC'97 controller indicate which of the corresponding 12 time slots are assigned to input data streams, and that they contain valid data. Figure 10 illustrates the time slot based AC-link protocol. There are several subsections within WM9701A that can independently go busy/ready. It is the responsibility of the WM9701A controller to probe more deeply into the WM9701A register file to determine which WM9701A subsections are actually ready.
WM9701A samples SYNC assertion
SYNC BIT_CLK SDATA_IN
AC'97 Controller samples first SDATA_IN bit of frame here
Codec Ready
Slot (1)
Slot (2)
End of previous Audio Frame
Figure 11 Start of an Audio Input Frame A new audio input frame begins with a low to high transition of SYNC as shown in Figure 11. SYNC is synchronous to the rising edge of BIT_CLK. On the immediately following falling edge of BIT_CLK, WM9701A samples the assertion of SYNC. This falling edge marks the time when both sides of AClink are aware of the start of a new audio frame. On the next rising edge of BIT_CLK, the AC'97 controller transitions SDATA_IN into the first bit position of slot 0 (valid frame bit). Each new bit position is presented to AC-link on a rising edge of BIT_CLK, and subsequently sampled by the AC'97 controller on the following falling edge of BIT_CLK. This sequence ensures that data transitions and subsequent sample points for both incoming and outgoing data streams are time aligned. SDATA_IN's composite stream is MSB justified (MSB first) with all non-valid bit positions (for assigned and/or unassigned time slots) stuffed with 0's by WM9701A. SDATA_IN is sampled on the falling edges of BIT_CLK .
WOLFSON MICROELECTRONICS LTD.
PD Rev 3.2 January 2001 13
WM9701A
SLOT 1: STATUS ADDRESS PORT
Production Data
The status port is used to monitor status for WM9701A functions including, but not limited to, mixer settings, and power management. Audio input frame slot 1 echoes the control register index, for historical reference, for the data to be returned in slot 2. (Assuming that slots 1 and 2 had been tagged "valid" by WM9701A during slot 0).
STATUS ADDRESS PORT BIT ASSIGNMENTS:
Bit(19) Bit(18:12) Bit(11:0) RESERVED (stuffed with 0s) Control register index (echo of register index for which data is being returned) RESERVED (stuffed with 0s)
The first bit (MSB) generated by WM9701A is always stuffed with a 0. The following 7 bit positions communicate the associated control register address, and the trailing 12-bit positions are stuffed with 0s by WM9701A.
SLOT 2: STATUS DATA PORT
The status data port delivers 16-bit control register read data. Bit(19:4) Bit(3:0) Control register read data (stuffed with 0s if tagged "invalid" by WM9701) RESERVED (stuffed with 0s)
If slot 2 is tagged "invalid" by WM9701A, then the entire slot will be stuffed with 0s by WM9701A.
SLOT 3: PCM RECORD LEFT CHANNEL
Audio input frame slot 3 is the left channel output of WM9701A's input Mux, post-ADC. WM9701A's ADCs can be implemented to support 16, 18, or 20-bit resolution. WM9701A ships out its ADC output data (MSB first), and stuffs any trailing non-valid bit positions with 0s to fill out its 20bit time slot.
SLOT 4: PCM RECORD RIGHT CHANNEL
Audio input frame slot 4 is the right channel output of WM9701A's input Mux, post-ADC. WM9701A's ADCs can be implemented to support 16, 18, or 20-bit resolution. WM9701A ships out its ADC output data (MSB first), and stuffs any trailing non-valid bit positions with 0s to fill out its 20-bit time slot.
SLOT 5: OPTIONAL MODEM LINE CODEC
Audio input frame slot 5 contains MSB justified modem ADC output data. This optional feature is not supported by WM9701A. This may be determined by the AC'97 controller interrogating the WM9701A Vendor ID register.
SLOT 6: OPTIONAL DEDICATED MICROPHONE RECORD DATA
Audio input frame slot 6 is an optional (post-ADC) third PCM system input channel available for dedicated use by a desktop microphone. This optional AC'97 feature is not supported by WM9701A. This may be determined by the AC'97 controller interrogating the WM9701A Vendor ID register.
SLOTS 7-12: RESERVED
Audio input frame slots 7-12 are reserved for future use and are always stuffed with 0s by WM9701A.
AC-LINK LOW POWER MODE
The AC-link signals can be placed in a low power mode. When WM9701A's power down Register (26h), is programmed to the appropriate value, both BIT_CLK and SDATA_IN will be brought to, and held at a logic low voltage level. BIT_CLK and SDATA_IN are transitioned low immediately following the decode of the write to the power down Register (26h) with PR4. When the AC'97 controller driver is at the point where it is ready to program the AC-link into its low power mode, slots 1 and 2 are assumed to be the only valid WOLFSON MICROELECTRONICS LTD. PD Rev 3.2 January 2001 14
Production Data
WM9701A
stream in the audio output frame. At this point in time it is assumed that all sources of audio input have also been neutralised. The AC'97 controller should also drive SYNC and SDATA_OUT low after programming WM9701A to this low power, "halted" mode. Once WM9701A has been instructed to halt BIT_CLK, a special "wake up" protocol must be used to bring the AC-link to the active mode since normal audio output and input frames can not be communicated in the absence of BIT_CLK.
WAKING UP THE AC-LINK
There are 2 methods for bringing the AC-link out of a low power, halted mode. Regardless of the method, it is the AC'97 controller that performs the wake up task. AC-link protocol provides for a "Cold WM9701A Reset", and a "Warm WM9701A Reset". The current power down state would ultimately dictate which form of WM9701A reset is appropriate. Unless a "cold" or "register" reset (a write to the Reset register) is performed, wherein the WM9701A registers are initialised to their default values, registers are required to keep state during all power down modes. Once powered down, re-activation of the AC-link via re-assertion of the SYNC signal must not occur for a minimum of 4 audio frame times following the frame in which the power down was triggered. When AC-link powers up it indicates readiness via the Codec Ready bit (input slot 0, bit 15).
COLD WM9701A RESET
A cold reset is achieved by asserting RESETB for the minimum specified time. By driving RESETB low, BIT_CLK, and SDATA_OUT will be activated, or re-activated as the case may be, and all WM9701A control registers will be initialised to their default power on reset values. RESETB is an asynchronous WM9701A input.
WARM WM9701A RESET
A warm WM9701A reset will re-activate the AC-link without altering the current WM9701A register values. A warm reset is signaled by driving SYNC high for a minimum of 1S in the absence of BIT_CLK. Within normal audio frames SYNC is a synchronous WM9701A input. However, in the absence of BIT_CLK, SYNC is treated as an asynchronous input used in the generation of a warm reset to WM9701A. WM9701A will not respond with the activation of BIT_CLK until SYNC has been sampled low again by WM9701A. This will preclude the false detection of a new audio frame.
SERIAL INTERFACE REGISTER MAP DESCRIPTION
(See Table 10) The serial interface bits perform control functions described as follows: The register map is fully specified by the AC'97 specification, and this description is simply repeated below, with optional unsupported features omitted.
RESET REGISTER (INDEX 00h)
Writing any value to this register performs a register reset, which causes all registers to revert to their default values. Reading this register returns the ID code of the part, indication of modem support (not supported by WM9701A) and a code for the type of 3D Stereo Enhancement (not supported by WM9701A).
WOLFSON MICROELECTRONICS LTD.
PD Rev 3.2 January 2001 15
WM9701A
The ID decodes the capabilities of WM9701A based on the following: BIT ID0 ID1 ID2 ID3 ID4 ID5 ID6 ID7 ID8 ID9 SE4....SE 0 FUNCTION Dedicated Mic PCM in channel Modem line Codec support Bass and treble control Simulated stereo (mono to stereo) Headphone out support Loudness (bass boost) support 18-bit DAC resolution 20-bit DAC resolution 18-bit ADC resolution 20-bit ADC resolution No stereo enhancement
Production Data
VALUE ON WM9701A 0 0 0 0 0 0 1 0 1 0 00000
Table 1 Reset Register Function Note that WM9701A defaults to indicate 18-bit compatibility. However, a control bit may be set in the vendor - specific registers that changes bits ID6 and ID8 to be `0', indicating a 16-bit device. It is unlikely that this function will be required, however, as the MSB justification of the ADC and DAC data means that a nominally 18-bit device should be fully compatible with controllers that only provide 16-bit support. (Most PC type applications will only require 16-bit operation).
PLAY MASTER VOLUME REGISTERS (INDEX 02h, 04h AND 06h)
These registers manage the output signal volumes. Register 02h controls the stereo master volume (both right and left channels), Register 04h controls the optional stereo headphone out, and Register 06h controls the mono volume output. Each step corresponds to 1.5dB. The MSB of the register is the mute bit. When this bit is set to 1 the level for that channel is set at -dB. ML5 to ML0 is for left channel level, MR5 through MR0 is for the right channel and MM5 to MM0 is for the mono out channel. Support for the MSB of the level is not provided by WM9701A. If the MSB is written to then WM9701A detects when that bit is set and sets all 4 LSBs to 1s. Example: If the driver writes a 1xxxxx WM9701A interprets that as x11111. It will also respond when read with x11111 rather than 1xxxxx, the value written to it. The driver can use this feature to detect if support for the 6th bit is there or not. The default value of both the mono and the stereo registers is 8000h (1000 0000 0000 0000), which corresponds to 0dB gain with mute on. MUTE 0 0 0 1 0 0000 0 0001 1 1111 x xxxx MX4...MX0 0dB attenuation 1.5dB attenuation 46.5dB attenuation FUNCTION
dB attenuation
Table 2 Volume Register Function
MASTER TONE CONTROL REGISTERS (INDEX 08h)
Optional register for support of tone controls (bass and treble). WM9701A does not support bass and treble and writing to this register will have no effect, reading will result in all don't care values.
PC BEEP REGISTER (INDEX 0Ah)
This controls the level for the PC-beep input. Each step corresponds to approximately 3dB of attenuation. The MSB of the register is the mute bit. When this bit is set to 1 the level for that channel is set at -dB. WM9701A defaults to the PC-beep path being muted, so an external speaker should be provided within the PC to alert the user to power on self-test problems.
WOLFSON MICROELECTRONICS LTD.
PD Rev 3.2 January 2001 16
Production Data
WM9701A
MUTE 0 0 1 0000 1111 xxxx PV3...PV0 FUNCTION 0dB attenuation 45dB attenuation
dB attenuation
Table 3 PC-beep Register Function
ANALOGUE MIXER INPUT GAIN REGISTERS (INDEX 0CH - 18h)
This controls the gain/attenuation for each of the analogue inputs. Each step corresponds to approximately 1.5dB. The MSB of the register is the mute bit. When this bit is set to 1 the level for that channel is set at -dB.
REGISTER 0EH (MIC VOLUME REGISTER)
This has an extra bit that is for a 20dB boost. When bit 6 is set to 1 the 20dB boost is on. The default value is 8008, which corresponds to 0dB gain with mute on. The default value for the mono registers is 8008h, which corresponds to 0dB gain with mute on. The default value for stereo registers is 8808h, which corresponds to 0dB gain with mute on. MUTE 0 0 0 1 00000 01000 11111 xxxxx GX4...GX0 +12dB gain 0dB gain -34.5dB gain -dB gain FUNCTION
Table 4 Mixer Gain Control Register Function
RECORD SELECT CONTROL REGISTER (INDEX 1Ah)
Used to select the record source independently for right and left. (see Table 5 for legend). The default value is 0000h, which corresponds to Mic in. SR2 -SR0 RIGHT RECORD SOURCE Mic CD in (R) Video in (R) Aux in (R) Line in (R) Stereo mix (R) Mono mix Phone 0 1 2 3 4 5 6 7 SL2-SL0 LEFT RECORD SOURCE
0 1 2 3 4 5 6 7
Mic CD in (L) Video in (L) Aux in (L) Line in (L) Stereo mix (L) Mono mix Phone
Table 5 Record Select Register Function
RECORD GAIN REGISTERS (INDEX 1Ch AND 1Eh)
1Ch is for the stereo input and 1Eh is for the optional special purpose correlated audio Mic channel. Each step corresponds to 1.5dB. 22.5dB corresponds to 0F0Fh and 000Fh respectively. The MSB of the register is the mute bit. When this bit is set to 1 the level for that channel(s) is set at -dB. The default value is 8000h, which corresponds to 0dB gain with mute on. MUTE 0 0 1 GX3...GX0 1111 0000 xxxxx FUNCTION +22.5dB gain 0dB gain -dB gain
Table 6 Record Gain Register Function
WOLFSON MICROELECTRONICS LTD.
PD Rev 3.2 January 2001 17
WM9701A
GENERAL PURPOSE REGISTER (INDEX 20h)
This register is used to control several miscellaneous functions of the WM9701A.
Production Data
Below is a summary of each bit and its function. Only the MIX, MS and LPBK bits are supported by WM9701A. The MS bit controls the Mic selector. The LPBK bit enables loop back of the ADC output to the DAC input without involving the AC-link, allowing for full system performance measurements. The function default value is 0000h which is all off. BIT POP ST 3D LD LLBK RLBK MIX MS LPBK FUNCTION PCM out path and mute, 0 = pre 3D, 1 = post 3D Simulated stereo enhancement, on/off 1 = on 3D stereo enhancement on/off, 1 = on Loudness (bass boost) on/off, 1 = on Local loop back - for modem, line Codec Remote loop back - for modem, line Codec Mono output select 0 = Mix, 1 = Mic Mic select 0 = Mic1, 1 = Mic2 ADC/DAC/ loop back mode No No No No No No Yes Yes Yes WM9701A SUPPORT
Table 7 General Purpose Register Function
3D CONTROL REGISTER (INDEX 22h)
This optional register is used to control the centre and/or depth of the 3D stereo enhancement function built into of the AC'97 component. This feature is not supported by the WM9701A.
MODEM SAMPLE RATE REGISTER (INDEX 24h)
This register controls what sample rate AC'97 is sending or receiving samples for the optional Modem in and out. This feature is not supported by WM9701A.
POWER DOWN CONTROL/STATUS REGISTER (INDEX 26h)
This read/write register is used to program power down states and monitor subsystem readiness. The lower half of this register is read only status, a 1 indicating that the subsection is "ready". Ready is defined as the subsection able to perform in its nominal state. When this register is written to the bit values that come in on AC-link will have no effect on read only bits 0 to 7. When the AC-link "Codec Ready" indicator bit (SDATA_IN slot 0, bit 15) is a 1 it indicates that the AC-link and WM9701A control and status registers are in a fully operational state. The AC'97 controller must further probe this power down Control/Status Register to determine exactly which subsections, if any, are ready. READ BIT MDM REF ANL DAC ADC FUNCTION Modem section ready - not supported VREFs up to nominal level Analogue mixers, etc ready DAC section ready to accept data ADC section ready to transmit data
Table 8 Power Down Status Register Function The power down modes are as follows. The first three bits are to be used individually rather than in combination with each other. The last bit PR3 can be used in combination with PR2 or by itself. PR0 and PR1 control the PCM ADCs and DACs only. PR7 independently controls the optional modem ADC and DAC, not supported by WM9701A.
WOLFSON MICROELECTRONICS LTD.
PD Rev 3.2 January 2001 18
Production Data
WM9701A
WRITE BIT PR0 PR1 PR2 PR3 PR4 PR5 PR6 PR7 FUNCTION PCM in ADCs and input Mux power down PCM out DACs power down Analogue mixer power down (VREF still on) Analogue mixer power down (VREF off) Digital interface (AC-Link) power down (external clock off) Internal clock disable HP amp power down - not supported Modem ADC/DAC off - not supported
Table 9 Power Down Control Register Function
PR0 = 1
PR1 = 1
PR2 = 1
PR4 = 1
NORMAL
ADCs OFF PR0
DACs OFF PR1
ANALOGUE OFF PR2 OR PR3
DIGITAL I/F OFF PR4
SHUT OFF CODA LINK
PR0 = 0 AND ADC = 1
PR1 = 0 AND DAC = 1
PR2 = 0 AND ANL = 1
WARM RESET
READY = 1 DEFAULT
COLD RESET
Figure 12 An Example of WM9701A Power Down/Power up Flow Figure 12 illustrates one example procedure to do a complete power down of WM9701A. From normal operation sequential writes to the power down Register are performed to power down WM9701A a piece at a time. After everything has been shut off, a final write (of PR4) can be executed to shut down the WM9701A's digital interface (AC-link). The part will remain in sleep mode with all its registers holding their static values. To wake up WM9701A, the AC'97 controller will send a pulse on the sync line issuing a warm reset. This will restart WM9701A's digital interface (resetting PR4 to 0). WM9701A can also be woken up with a cold reset. A cold reset will cause a loss of values of the registers, as a cold reset will set them to their default states. When a section is powered back on, the power down Control/Status register (index 26h) should be read to verify that the section is ready (i.e. stable) before attempting any operation that requires it. Alternatively if RESETB is held low, all PR bits are held set so the device is held powered off until RESETB is taken high again.
WOLFSON MICROELECTRONICS LTD.
PD Rev 3.2 January 2001 19
WM9701A
PR1 = 1 PR2 = 1 PR4 = 1
Production Data
ADCs OFF PR0
DACs OFF PR1
ANALOGUE OFF PR2 OR PR3
DIGITAL I/F OFF PR4
SHUT OFF CODA LINK
PR1 = 0 AND DAC = 1
PR2 = 0 AND ANL = 1
WARM RESET
Figure 13 WM9701A Power Down/Flow with Analogue Still Alive Figure 13 illustrates a state when all the mixers should work with the static volume settings that are contained in their associated registers. This is used when the user could be playing a CD (or external LINE_IN source) through WM9701A to the speakers but have most of the system in low power mode. The procedure for this follows the previous except that the analogue mixer is never shut down.
POWERDOWN CONTROL/STATUS REGISTER (INDEX 26H)
Also when RESETB pin is asserted low, all PR bits are over-ridden and the entire device is powered off to ultra low power state for as long as RESETB = low. On releasing RESETB, the device is reset (all active) and powered up.
RESERVED REGISTERS (INDEX 28h - 58h)
These registers are reserved by AC'97 and have no function on WM9701A.
VENDOR RESERVED REGISTERS (INDEX 5AH - 7Ah)
These are reserved for future use and are vendor specific. Do not write to these registers unless the Vendor ID register has been checked first to ensure that the driver knows the source of the AC'97 component. Values stored in this register are used to provide test modes for the manufacturer.
VENDOR SPECIFIC GAIN CONTROL REGISTERS - (INDEX 70H TO 74H)
Not used in the WM9701A.
VENDOR ID REGISTERS (INDEX 7Ch - 7Eh)
This register is for specific vendor identification if so desired. The ID method is Microsoft's Plug and Play Vendor ID code. The first character of that ID is F7 to F0, the second character S7 to S0 and the third T7 to T0. These three characters are ASCII encoded. The REV7 to REV0 field is for the Vendor Revision number. In WM9701A the vendor ID is set to WML0. Wolfson is a registered Microsoft Plug and Play vendor.
WOLFSON MICROELECTRONICS LTD.
PD Rev 3.2 January 2001 20
Production Data
WM9701A
SERIAL INTERFACE REGISTER MAP
The following table shows the function and address of the various control bits that are loaded through the serial interface during write operations.
Reg. Num. 00h 02h 06h 0Ah OCh OEh 10h 12h 14h 16h 18h 1Ah 1Ch 20h 26H Name Reset Master Volume Master Vol. Mono PCBEEP Volume Phone Volume Mic Volume Line In Volume CD Volume Video Volume Aux Volume PCM Out Vol. Record Select Record Gain General Purpose Powerdown Ctrl/Stat Reserved Vendor Reserved Vendor Reserved Vendor ID1 Vendor ID2 D15 X Mute Mute Mute Mute Mute Mute Mute Mute Mute Mute X Mute X X X X X D14 SE4 X X X X X X X X X X D13 SE3 X X X X X X X X X X X X X PR5 D12 SE2 ML4 X X X X GL4 GL4 GL4 GL4 GL4 X X X PR4 D11 SE1 ML3 X X X X GL3 GL3 GL3 GL3 GL3 X GL3 X PR3 D10 SEO ML2 X X X X GL2 GL2 GL2 GL2 GL2 SL2 GL2 X PR2 D9 ID9 ML1 X X X X GL1 GL1 GL1 GL1 GL1 SL1 GL1 MIX PR1 D8 ID8 ML0 X X X X GL0 GL0 GL0 GL0 GL0 SL0 GL0 MS PR0 D7 ID7 X X X X X X X X X X X X LPBK X D6 ID6 X X X X 20 dB X X X X X X X X X D5 ID5 X X X X X X X X X X X X X X D4 ID4 MR4 MM4 PV3 GN4 GN4 GR4 GR4 GR4 GR4 GR4 X X X X D3 ID3 MR3 MM3 PV2 GN3 GN3 GR3 GR3 GR3 GR3 GR3 X GR3 X REF D2 ID2 MR2 MM2 PV2 GN2 GN2 GR2 GR2 GR2 GR2 GR2 SR2 GR2 X ANL D1 ID1 MR1 MM1 PV0 GN1 GN1 GR1 GR1 GR1 GR1 GR1 SR1 GR1 X DAC D0 ID0 MM0 MM0 X GN0 GN0 GR0 GR0 GR0 GR0 GR0 SR0 GR0 X ADC Default 0140h 8000h 8000h 8000h 8008h 8008h 8808h 8808h 8808h 8808h 8808h 0000h 8000h 0000h 000Fh
28h 5Ah 7Ah 7Ch 7Eh
X X X F7 T7
X X X F6 T6
X X X F5 T5
X X X F4 T4
X X X F3 T3
X X X F2 T2
X X X F1 T1
X X X F0 T0
X X X S7 REV 7
X X X S6 REV 6
X X X S5 REV 5
X X X S4 REV 4
X X X S3 REV 3
X X X S2 REV 2
X X X S1 REV 1
X X X S0 REV 0
X X X 574D 4COO
Table 10 Serial Interface Register Map Description
WOLFSON MICROELECTRONICS LTD.
PD Rev 3.2 January 2001 21
WM9701A RECOMMENDED EXTERNAL COMPONENTS
DVDD AVDD 1
C1 C2
Production Data
DVDD1 DVDD2 DVSS1 DVSS2
AVDD1 AVDD2 AVSS1 AVSS2
25 38
C3 C4
9 4 7
26 42
DGND
C5 C6 C7 C8 C9 C10
12 13 14 15 16 17 18 19 20 21 22 23 24
AGND PCBEEP PHONE AUXL AUXR VIDEOL VIDEOR CDL CDGND CDR MIC1 MIC2 LINEINL LINEINR LINEOUTL LINEOUTR MONOOUT AGND 35 36 37 + C23 +
C24
CAP2 32 27 VREF 28 VREFOUT
C18 C19 C20 + C21 C22 +
MIXER INPUTS
C11 C12 C13 C14 C15 C16 C17
STEREO OUTPUT MONO OUTPUT
+ C25
NC 29 30 NC 31 NC 33 NC 34 NC 39 NC 40 NC NC 41 NC 43
5 6
SDATAOUT BITCLK SDATAIN SYNC RESETB XTLIN XTLOUT 3
XT C26 C27
NC 44 NC 45 NC 46 47 48
AC-LINK
8 10 11
NC NC
Notes: 1. C1 to C19 and C21 should be as close to WM9701A as possible. 2. AGND and DGND should be connected as close to WM9701A as possible.
2
DGND
Figure 14 External Components Diagram
WOLFSON MICROELECTRONICS LTD.
PD Rev 3.2 January 2001 22
Production Data
WM9701A
SUGGESTED VALUE 10nF 470nF 1F 0.1F 10F 0.1F 10F 10F 22pF 24.576 MHz Output AC coupling caps to remove VREF DC level from outputs. Optional capacitors for better crystal frequency stability. AC'97 master clock frequency. A bias resistor is not required, but if connected will not affect operation if value is large (above 1M). DESCRIPTION De-coupling for DVDD and AVDD AC coupling capacitors for setting DC level of analogue inputs. Value chosen to give corner frequency below 20Hz for minimum 10K input impedance. Reference de-coupling capacitors for ADC, DAC, Mixer and CAP2 references. Ceramic type or similar.
RECOMMENDED EXTERNAL COMPONENTS VALUES
COMPONENT REFERENCE C1 to C4 C5 to C17 C18 C19 C20 C21 C22 C23 to C25 C26 and C27 XT
Table 11 External Component Recommendations
RECOMMENDATIONS FOR 3.3V OPERATION
The device's performance with AVDD = 3.3V is shown in Electrical Characteristics. In 3.3V analogue operation, mid-rail reference scales to 1.5V. All ADC and DAC references are 3/5ths of their nominal 5V value. Input and output signals that are 1Vrms in 5V applications, scale to 660mVrms in 3.3V applications. If 1Vrms output is required, the mixer gain adjust PGAs need to be increased by 3 times 1.5dB steps.
WOLFSON MICROELECTRONICS LTD.
PD Rev 3.2 January 2001 23
WM9701A PACKAGE DIMENSIONS
FT: 48 PIN TQFP (7 x 7 x 1.4 mm)
Production Data
DM003.B
b
e
25
36
37
24
E1
E
48
13
1
12
D1 D c
A A2
A1
L
-Cccc C
SEATING PLANE
Symbols A A1 A2 b c D D1 E E1 e L MIN ----0.05 1.35 0.17 0.09
ccc REF:
0.45 o 0
Dimensions (mm) NOM --------1.40 0.22 ----9.00 BSC 7.00 BSC 9.00 BSC 7.00 BSC 0.50 BSC 0.60 o 3.5
MAX 1.60 0.15 1.45 0.27 0.20
0.75 o 7
Tolerances of Form and Position 0.08 JEDEC.95, MS-026
NOTES: A. ALL LINEAR DIMENSIONS ARE IN MILLIMETERS. B. THIS DRAWING IS SUBJECT TO CHANGE WITHOUT NOTICE. C. BODY DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSION, NOT TO EXCEED 0.25MM. D. MEETS JEDEC.95 MS-026, VARIATION = BBC. REFER TO THIS SPECIFICATION FOR FURTHER DETAILS.
WOLFSON MICROELECTRONICS LTD.
PD Rev 3.2 January 2001 24

▲Up To Search▲

Price & Availability of WM9701

	To Download WM9701 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .