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STA308
MULTICHANNEL DIGITAL AUDIO PROCESSOR WITH DDXTM
PRODUCT PREVIEW
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8 DDXTM Channels Capability (24 bit) From 32kHz to 192kHz Input Sample Rates Supported Volume Control from 0 to -100dB (0.5 dB steps) Variable Digital Gain from 0 to 24dB (0.5dB steps) with Digital Limiter Functionality and Variable Attack and Release Time I2S Inputs and Outputs Individual Channel and Master Gain/ Attenuation Individual Channel Mute and Zero Input Detect Auto-Mute Selectable Serial Audio Data Interface Bass/Treble Controls Channel Mapping of any Input to any Processing/DDXTM Channel Active Crossover Capability DC Blocking Selectable High-Pass Filter Selectable Bass Management on Channel 6 Selectable Adjacent Channel Mixing Capability Selectable DDXTM Headphone Output on Channels 7 & 8 Selectable Clock Input Ratio Selectable De-emphasis Selectable DDXTM Ternary, or Binary PWM output AM Interference Reduction Mode I2C Control DESCRIPTION The STA308 is a single chip solution for digital audio processing and control in multi-channel applications. It provides output capabilities for DDXTM (Direct Digital Amplification). In conjunction with a DDXTM power device, it provides high-quality, high-efficiency, all digital amplification. The device is extremely versatile allowing for input of most digital formats including 6.1 channel and 192kHz, 24-bit DVD-Audio. The internal 24-bit DSP allows for high resolution processing at all standard input sample frequencies. Processing includes volume control, filtering, bass management, gain compression/limiting and PCM and DDXTM outputs. Filtering includes five user-programmable 28-bit biquads for EQ per channel, as well as bass, treble and DC blocking. External clocking can be provided at 4 different ratios of the input sample frequency. All sample frequencies are upsampled for processing. Each internal processing channel can receive any input channel, allowing flexibility and the ability to perform active digital crossover for powered loudspeaker systems. The serial audio data interface accepts many different formats, including the popular I2S format. Eight channels of DDX processing are performed.
TQFP64 ORDERING NUMBER: STA308
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December 2002
This is preliminary information on a new product foreseen to be developed. Details are subject to change without notice.
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BLOCK DIAGRAM
SA SCL SDA MVO OUT1A/B
LRCKI BICKI SDI12 SDI34 SDI56 SDI78
SERIAL DATA IN
IC
OVERSAMPLING SYSTEM CONTROL
2
OUT2A/B OUT3A/B OUT4A/B OUT5A/B OUT6A/B OUT7A/B OUT8A/B VOLUME LIMITING LRCKO
DDX
CHANNEL MAPPING
VARIABLE OVERSAMPLING
TREBLE, BASS, EQ (BIQUADS)
SYSTEM TIMING PLLB
PLL
POWER DOWN
VARIABLE DOWNSAMPLING
SERIAL DATA OUT
BICKO SDO12 SDO34 SDO56 SDO78
XTI
CKOUT
PWDN
EAPD
Figure 1. Signal Flow Diagram
Channels 1-8 1st Stage Interpolation Output
Scale & Mix Interp_Rate
Bass Management
(Channel 6 only)
8 Inputs From I2S
BME Channel Mapping 1x,2x,4x Interp Biquads B/T Volume Limiter 2x Interp
Noise & Distortion Reduction
DDX Output PWM
DDX (Channels 7&8 only)
Headphone
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IN CONNECTION (Top view)
OUT1_A OUT1_B
48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
SDO_78
SDO_56
SDO_34
SDO_12
LRCKO
BICKO
PWDN
64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 MVO GND VDD3 GND VDD SDI_78 SDI_56 SDI_34 SDI_12 LRCKI BICKI VDD3 GND VDD RESET PLLB 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 OUT2_A OUT2_B VDD GND VDD3 OUT3_A OUT3_B OUT4_A OUT4_B OUT5_A OUT5_B VDD GND VDD3 OUT6_A OUT6_B
OUT8_B
OUT8_A
EAPD
VDD3
VDD3
GND
GND
VDD
VDD
OUT7_B
FILTER_PLL
OUT7_A
VDDA
GNDA
VDD3
CKOUT
VDD
GND
VDD3
SA
SDA
SCL
XTI
D02AU1356
PIN FUNCTION
PIN 1 3, 12, 24, 28, 35, 44, 52, 59 2, 4, 13, 27, 36, 45, 53, 60 5, 14, 26, 37, 46, 54, 61 6 7 8 9 10 11 15 16 17 18 NAME MVO VDD3 GND VDD TYPE I DESCRIPTION Master Volume Override 3.3V Digital Supply Digital Ground 2.5V Digital Supply PAD TYPE CMOS Input Buffer with Pull-Down 3.3V Digital Power Supply Voltage (pad ring) Digital Ground 2.5V Digital Power Supply Voltage (core + ring) 5V Tolerant TTL Input Buffer 5V Tolerant TTL Input Buffer 5V Tolerant TTL Input Buffer 5V Tolerant TTL Input Buffer 5V Tolerant TTL Input Buffer 5V Tolerant TTL Input Buffer 5V Tolerant TTL Schmitt Trigger Input Buffer CMOS Input Buffer with Pull-Down CMOS Input Buffer with Pull-Down Bidirectional Buffer: 5V Tolerant TTL Schmitt Trigger Input; 3.3V Capable 2 mA Slew-rate control Output; 5V Tolerant TTL Schmitt Trigger Input Buffer
SDI_78 SDI_56 SDI_34 SDI_12 LRCKI BICKI RESET PLLB SA SDA
I I I I I I I I I I/O
Input I2S Serial Data Channels 7 & Input I2S Serial Data Channels 5 & Input I2S Serial Data Channels 3 & Input I2S Serial Data Channels 1 & Inputs I2C Left/Right Clock Inputs I2C Serial Clock Global Reset PLL Bypass Select Address (I2C) I2C Serial Data
8 6 4 2
19
SCL
I
I2C Serial Clock
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PIN FUNCTION (continued)
PIN 20 21 22 23 25 29 30 31 32 33 34 38 39 40 41 42 43 47 48 49 50 51 55 56 57 58 62 63 64 NAME XTI FILTER_PLL VDDA GNDA CKOUT OUT8_B OUT8_A OUT7_B OUT7_A OUT6_B OUT6_A OUT5_B OUT5_A OUT4_B OUT4_A OUT3_B OUT3_A OUT2_B OUT2_A OUT1_B OUT1_A EAPD BICKO LRCKO SDO_12 SDO_34 SDO_56 SDO_78 PWDN TYPE I DESCRIPTION Crystal Oscillator Input (Clock Input) PLL Filter PLL 2.5V Supply PLL Ground Clock Output PWM Channel 8 Output B PWM Channel 8 Output A PWM Channel 7 Output B PWM Channel 7 Output A PWM Channel 6 Output B PWM Channel 6 Output A PWM Channel 5 Output B PWM Channel 5 Output A PWM Channel 4 Output B PWM Channel 4 Output A PWM Channel 3 Output B PWM Channel 3 Output A PWM Channel 2 Output B PWM Channel 2 Output A PWM Channel 1 Output B PWM Channel 1 Output A External Amplifier Power Down Output I2S Serial Clock Output I2S Left/Right Clock Output I2S Serial Data Channels 1 & 2 Output I2S Serial Data Channels 3 & 4 Output I2S Serial Data Channels 5 & 6 Output I2S Serial Data Channels 7 & 8 Device Powerdown PAD TYPE 3.3V Tolerant TTL Schmitt Trigger Input Buffer Analog Pad 2.5V Analog Power Supply Voltage Analog Ground 3.3V Capable TTL Tristate 4mA Output Buffer 3.3V Capable TTL 2mA Output Buffer 3.3V Capable TTL 2mA Output Buffer 3.3V Capable TTL 2mA Output Buffer 3.3V Capable TTL 2mA Output Buffer 3.3V Capable TTL 2mA Output Buffer 3.3V Capable TTL 2mA Output Buffer 3.3V Capable TTL 2mA Output Buffer 3.3V Capable TTL 2mA Output Buffer 3.3V Capable TTL 2mA Output Buffer 3.3V Capable TTL 2mA Output Buffer 3.3V Capable TTL 2mA Output Buffer 3.3V Capable TTL 2mA Output Buffer 3.3V Capable TTL 2mA Output Buffer 3.3V Capable TTL 2mA Output Buffer 3.3V Capable TTL 2mA Output Buffer 3.3V Capable TTL 2mA Output Buffer 3.3V Capable TTL 2mA Output Buffer 3.3V Capable TTL 2mA Output Buffer 3.3V Capable TTL 2mA Output Buffer 3.3V Capable TTL 2mA Output Buffer 3.3V Capable TTL 2mA Output Buffer 3.3V Capable TTL 2mA Output Buffer 3.3V Capable TTL 2mA Output Buffer 5V Tolerant TTL Schmitt Trigger Input Buffer
O O O O O O O O O O O O O O O O O O O O O O O O I
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ABSOLUTE MAXIMUM RATINGS
Symbol VDD_3.3 VDD_2.5 Vi Vo Tstg Tamb 3.3V I/O Power Supply 2.5V Logic Power Supply Voltage on input pins Voltage on output pins Storage Temperature Ambient Operating Temperature Parameter Value -0.5 to 4 -0.5 to 3.3 -0.5 to (VDD+0.5) -0.5 to (VDD+0.3) -40 to +150 -20 to +85 Unit V V V V C C
THERMAL DATA
Symbol Rthj-amb Parameter Thermal resistance Junction to Ambient Value 85 Unit C/W
RECOMMENDED DC OPERATING CONDITIONS
Symbol VDD_3.3 VDD_2.5 Tj I/O Power Supply Logic Power Supply Operating Junction Temperature Parameter Value 3.0 to 3.6 2.3 to 2.7 -20 to +125 Unit V V C
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ELECTRICAL CHARACTERISTCS (VDD3 = 3.3V 0.3V; VDD = 2.5V 0.2V; Tamb = 0 to 70 C; unless otherwise specified) GENERAL INTERFACE ELECTRICAL CHARACTERISTICS
Symbol Iil Iih IOZ Vesd Parameter Low Level Input no pull-up High Level Input no pull-down Tristate output leakage without pullup/down Electrostatic Protection Test Condition Vi = 0V Vi = VDD3 Vi = VDD3 Leakage < 1A 2000 Min. Typ. Max. 1 2 2 Unit A A A V Note 1 1 1 2
Note 1: The leakage currents are generally very small, < 1na. The values given here are maximum after an electrostatic stress on the pin. Note 2: Human Body Model
DC ELECTRICAL CHARACTERISTICS: 3.3V BUFFERS
Symbol VIL VIH VILhyst VIHhyst Vhyst VOL VOL Parameter Low Level Input Voltage High Level Input Voltage Low Level Threshold High Level Threshold Schmitt Trigger Hysteresis Low Level Output High Level Output IoI = 100uA Ioh = -100uA VDD3-0.2 Input Falling Input Rising 2.0 0.8 1.3 0.3 1.35 2.0 0.8 0.4 Test Condition Min. Typ. Max. 0.8 Unit V V V V V V V
DC ELECTRICAL CHARACTERISTICS: 2.5V BUFFERS
Symbol VILst VIHst VILhyst Parameter Low Level Input Voltage High Level Input Voltage Low Level Threshold Test Condition Schmitt input Schmitt input non Schmitt, Input Falling non Schmitt, Input Rising 1.3 0.7*VDD 0.5*VDD Min. Typ. Max. 0.26*VDD Unit V V V
VIHhyst
High Level Threshold
0.5*VDD
2.0
V
Vhyst VOL VOH
Schmitt Trigger Hysteresis Low Level Output High Level Output Note 1 Note 1
0.23*VDD 0.15*VDD 0.85*VDD
V V V
Notes: 1. Source/Sink current under worst-case conditions.
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1.0 PIN DESCRIPRTION 1.1 MVO: Master Volume Override This pin enables the user to bypass the Volume Control on all channels. When MVO is pulled High, the Master Volume Register is set to 00h, which corresponds to its Full Scale setting. The Master Volume Register Setting offsets the individual Channel Volume Settings, which default to 0dB. 1.2 SDI_12 through 78: Serial Data In Audio information enters the device here. Six format choices are available including I2S, left- or right-justified, LSB or MSB first, with word widths of 16, 18, 20 and 24 bits. 1.3 RESET Driving this pin (low) turns off the outputs and returns all settings to their defaults. 1.4 I2C The SA, SDA and SCL pins operate per the Philips I2C specification. See Section 2. 1.5 PLL: Phase Locked Loop The phase locked loop section provides the System Timing Signals and CKOUT. 1.6 CKOUT: Clock Out System synchronization and master clocks are provided by the CKOUT. 1.7 OUT1 through OUT8: PWM Outputs The PWM outputs provide the input signal for the power devices. 1.8 EAPD: External Amplifier Power-Down This signal can be used to control the power-down of DDX power devices. 1.9 SDO_12 through 78: Serial Data Out Audio information exits the device here. Six different format choices are available including I2S, left- or rightjustified, LSB or MSB first, with word widths of 16, 18, 20 and 24 bits. 1.10 PWDN: Device Power-Down This puts the STA308 into a low-power state via appropriate power-down sequence. Pulling PWDN low begins power-down sequence, and EAPD goes low ~30ms later.
2.0 II2C BUS SPECIFICATION The STA308 supports the I2C protocol. This protocol defines any device that sends data on to the bus as a transmitter and any device that reads the data as a receiver. The device that controls the data transfer is known as the master and the other as the slave. The master always starts the transfer and provides the serial clock for synchronization. The STA308 is always a slave device in all of its communications.
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2.1 COMMUNICATION PROTOCOL 2.1.1 Data Transition or change Data changes on the SDA line must only occur when the SCL clock is low. SDA transition while the clock is high is used to identify a START or STOP condition. 2.1.2 Start Condition START is identified by a high to low transition of the data bus SDA signal while the clock signal SCL is stable in the high state. A START condition must precede any command for data transfer. 2.1.3 Stop Condition STOP is identified by low to high transition of the data bus SDA signal while the clock signal SCL is stable in the high state. A STOP condition terminates communication between STA308 and the bus master. 2.1.4 Data Input During the data input the STA308 samples the SDA signal on the rising edge of clock SCL. For correct device operation the SDA signal must be stable during the rising edge of the clock and the data can change only when the SCL line is low. 2.2 DEVICE ADDRESSING To start communication between the master and the STA308, the master must initiate with a start condition. Following this, the master sends onto the SDA line 8-bits (MSB first) corresponding to the device select address and read or write mode. The 7 most significant bits are the device address identifiers, corresponding to the I2C bus definition. In the STA308 the I2C interface has two device addresses depending on the SA pin configuration, 0x30 or 0011000x when SA = 0, and 0x32 or 0011001x when SA = 1. The 8th bit (LSB) identifies read or write operation RW, this bit is set to 1 in read mode and 0 for write mode. After a START condition the STA308 identifies on the bus the device address and if a match is found, it acknowledges the identification on SDA bus during the 9th bit time. The byte following the device identification byte is the internal space address. 2.3 WRITE OPERATION Following the START condition the master sends a device select code with the RW bit set to 0. The STA308 acknowledges this and the writes for the byte of internal address. After receiving the internal byte address the STA308 again responds with an acknowledgement. 2.3.1 Byte Write In the byte write mode the master sends one data byte, this is acknowledged by the STA308. The master then terminates the transfer by generating a STOP condition. 2.3.2 Multi-byte Write The multi-byte write modes can start from any internal address. The master generating a STOP condition terminates the transfer.
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Write Mode Sequence
ACK BYTE WRITE START DEV-ADDR SUB-ADDR ACK DATA IN ACK
RW
STOP
ACK MULTIBYTE WRITE START DEV-ADDR SUB-ADDR
ACK DATA IN
ACK DATA IN
ACK
RW
STOP
Read Mode Sequence
ACK CURRENT ADDRESS READ START NO ACK
DEV-ADDR
DATA
RW ACK ACK SUB-ADDR
STOP ACK DEV-ADDR DATA NO ACK
RANDOM ADDRESS READ START
DEV-ADDR
SEQUENTIAL CURRENT READ START
RW RW= ACK HIGH DEV-ADDR DATA
START ACK DATA
RW ACK DATA NO ACK
STOP
STOP ACK ACK SUB-ADDR DEV-ADDR ACK DATA ACK DATA ACK DATA NO ACK
SEQUENTIAL RANDOM READ START
DEV-ADDR
RW
START
RW
STOP
Table 1. Register summary
Address 00h 01h 02h 03h 04h 05h 06h 07h 08h 09h 0Ah 0Bh 0Ch 0Dh 0Eh 0Fh Name ConfA ConfB ConfC ConfD ConfE ConfF Mmute Mvol Cmute C1Vol C2Vol C3Vol C4Vol C5Vol C6Vol C7Vol MV7 C8M C1V7 C2V7 C3V7 C4V7 C5V7 C6V7 C7V7 MV6 C7M C1V6 C2V6 C3V6 C4V6 C5V6 C6V6 C7V6 MV5 C6M C1V5 C2V5 C3V5 C4V5 C5V5 C6V5 C7V5 MV4 C5M C1V4 C2V4 C3V4 C4V4 C5V4 C6V4 C7V4 MV3 C4M C1V3 C2V3 C3V3 C4V3 C5V3 C6V3 C7V3 MV2 C3M C1V2 C2V2 C3V2 C4V2 C5V2 C6V2 C7V2 MV1 C2M C1V1 C2V1 C3V1 C4V1 C5V1 C6V1 C7V1 D7 MPC DRC HPB BQL DCV EAPD D6 HPE ZCE CSZ4 PSL SAOFB D5 BME SAIFB CSZ3 COS1 SAO2 D4 IR1 SAI2 CSZ2 COS0 SAO1 D3 IR0 SAI1 CSZ1 C78BO SAO0 AME D2 MCS2 SAI0 CSZ0 C56BO DEMP COD D1 MCS1 ZDE OM1 C34BO VOLEN I2SD D0 MCS0 DSPB OM0 C12BO MIXE PWMD MMute MV0 C1M C1V0 C2V0 C3V0 C4V0 C5V0 C6V0 C7V0
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10h 11h 12h 13h 14h 15h 16h 17h 18h 19h 1Ah 1Bh 1Ch 1Dh 1Eh 1Fh 20h 21h 22h 23h 24h 25h 26h 27h 28h 29h 2Ah 2Bh 2Ch 2Dh 2Eh 2Fh 30h C8Vol C12im C34im C56im C78im C1234ls C5678ls L1ar L1atrt L2ar L2atrt Tone Cfaddr B2cf1 B2cf2 B2cf3 B0cf1 B0cf2 B0cf3 A2cf1 A2cf2 A2cf3 A1cf1 A1cf2 A1cf3 B1cf1 B1cf2 B1cf3 Cfud DC1 DC2 BIST1 BIST2 DCC23 DCC15 R4BEND DCC22 DCC14 R3BEND DCC21 DCC13 R2BEND DCC20 DCC12 R1BEND R5BBAD DCC19 DCC11 R4BACT R4BBAD DCC18 DCC10 R3BACT R3BBAD C4LS1 C8LS1 L1R3 L1AT3 L2R3 L2AT3 TTC3 CFA7 C1B23 C1B15 C1B7 C2B23 C2B15 C2B7 C3B23 C3B15 C3B7 C4B23 C4B15 C4B7 C5B23 C5B15 C5B7 C8V7 C8V6 C2IM2 C4IM2 C6IM2 C8IM2 C4LS0 C8LS0 L1R2 L1AT2 L2R2 L2AT2 TTC2 CFA6 C1B22 C1B14 C1B6 C2B22 C2B14 C2B6 C3B22 C3B14 C3B6 C4B22 C4B14 C4B6 C5B22 C5B14 C5B6 C8V5 C2IM1 C4IM1 C6IM1 C8IM1 C3LS1 C7LS1 L1R1 L1AT1 L2R1 L2AT1 TTC1 CFA5 C1B21 C1B13 C1B5 C2B21 C2B13 C2B5 C3B21 C3B13 C3B5 C4B21 C4B13 C4B5 C5B21 C5B13 C5B5 C8V4 C2IM0 C4IM0 C6IM0 C8IM0 C3LS0 C7LS0 L1R0 L1AT0 L2R0 L2AT0 TTC0 CFA4 C1B20 C1B12 C1B4 C2B20 C2B12 C2B4 C3B20 C3B12 C3B4 C4B20 C4B12 C4B4 C5B20 C5B12 C5B4 C2LS1 C6LS1 L1A3 L1RT3 L2A3 L2RT3 BTC3 CFA3 C1B19 C1B11 C1B3 C2B19 C2B11 C2B3 C3B19 C3B11 C3B3 C4B19 C4B11 C4B3 C5B19 C5B11 C5B3 C8V3 C8V2 C1IM2 C3IM2 C5IM2 C7IM2 C2LS0 C6LS0 L1A2 L1RT2 L2A2 L2RT2 BTC2 CFA2 C1B18 C1B10 C1B2 C2B18 C2B10 C2B2 C3B18 C3B10 C3B2 C4B18 C4B10 C4B2 C5B18 C5B10 C5B2 C8V1 C1IM1 C3IM1 C5IM1 C7IM1 C1LS1 C5LS1 L1A1 L1RT1 L2A1 L2RT1 BTC1 CFA1 C1B17 C1B9 C1B1 C2B17 C2B9 C2B1 C3B17 C3B9 C3B1 C4B17 C4B9 C4B1 C5B17 C5B9 C5B1 WA DCC17 DCC9 R2BACT R2BBAD C8V0 C1IM0 C3IM0 C5IM0 C7IM0 C1LS0 C5LS0 L1A0 L1RT0 L2A0 L2RT0 BTC0 CFA0 C1B16 C1B8 C1B0 C2B16 C2B8 C2B0 C3B16 C3B8 C3B0 C4B16 C4B8 C4B0 C5B16 C5B8 C5B0 W1 DCC16 DCC8 R1BACT R1BBAD
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3.0 CONFIGURATION REGISTER A (ADDRESS 00H)
BIT NAME RST D7 MPC 1 D6 MPE 0 D5 BME 0 D4 IR1 0 D3 IR0 0 D2 MCS2 0 D1 MCS1 1 D0 MCS0 1
3.0.1 Master Clock Select
BIT 0 1 2 R/W R/W R/W R/W RST 1 1 0 NAME MCS0 MCS1 MCS2 DESCRIPTION Master Clock Select : Selects the ratio between the input I2S sample frequency and the input clock.
The STA308 will support sample rates of 32kHz, 44.1kHz, 48Khz, 88.2kHz, 96kHz, 176.4kHz, and 192kHz. Therefore the internal clock will be: - 65.536Mhz for 32kHz - 90.3168Mhz for 44.1khz, 88.2kHz, and 176.4kHz - 98.304Mhz for 48kHz, 96kHz, and 192kHz The external clock frequency provided to the XTI pin must be a multiple of the input sample frequency(fs). The relationship between the input clock and the input sample rate is determined by both the MCSx and the IRx (Input Rate) register bits. The MCSx bits determine the PLL factor generating the internal clock and the IRx bits determine the oversampling ratio used internally.
Input Sample Rate fs (kHz) IR 1xx 32, 44.1, 48 88.2, 96 176.4, 192 00 01 10 128fs 64fs 64fs 011 256fs 128fs 128fs MCS(2..0) 010 384fs 192fs 192fs 001 512fs 256fs 256fs 000 768fs 384fs 384fs
3.0.2 Interpolation Ratio Select
BIT 2 3 R/W R/W R/W RST 0 0 NAME IR0 IR1 DESCRIPTION Interpolation Ratio Select : Selects internal interpolation ratio based on input I2S sample frequency
The STA308 has variable interpolation (oversampling) settings such that internal processing and DDX output rates remain consistent. The first processing block interpolates by either 4 times, 2 times, or 1 time (passthrough). The IR bits determine the oversampling ratio of this interpolation. Table 2. IR bit settings as a function of Input Sample Rate.
Input Sample Rate Fs 32kHz 44.1kHz 48kHz 88.2kHz 96kHz 176.4kHz 192kHz IR(1,0) 00 00 00 01 01 10 10 1st Stage Interpolation Ratio 4 times oversampling 4 times oversampling 4 times oversampling 2 times oversampling 2 times oversampling Pass-Through Pass-Through
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3.0.3 Bass Management Enable
BIT 5 R/W R/W RST 0 NAME BME DESCRIPTION Bass Management Enable : 0 - No Bass Management 1 - Bass Management operation on channel 6, scale and add inputs
Channel 6 of the STA308 features a bass management mode that enables redirection of information in all other channels to this channel and which can then be filtered appropriately using the EQ(Biquad) section. Setting the BME bit selects the output of the scale and mix block for channel 6 instead of the output of the channel mapping block. The settings for the scale and mix block are provided by the CxBMS registers 3.0.4 DDX Headphone Output Enable
BIT 6 R/W R/W RST 0 NAME HPE DESCRIPTION DDX Headphone Enable : 0 - Channels 7,8 normal DDX operation. 1 - Channels 7,8 DDX Headphone operation.
Channels 7 and 8 of the STA308 have the option to be processed for headphones. The headphone output can then be driven using an appropriate output device. This signal is a fully differential 3-wire drive called DDX Headphone 3.0.5 Max Power Correction
BIT 7 R/W R/W RST 1 NAME MPC DESCRIPTION Max Power Correction : Setting of 1 enables DDX correction for THD reduction near maximum power output.
Setting the MPC bit turns on special processing that corrects the DDX power device at high power. This mode should lower the THD+N of a full DDX system at maximum power output and slightly below. This mode will only be operational in OM= 00 or 10. 3.1 Configuration Register B (address 01h)
BIT NAME RST D7 DRC 0 D6 ZCE 1 D5 SAIFB 0 D4 SAI2 0 D3 SAI1 0 D2 SAI0 0 D1 ZDE 1 D0 DSPB 0
3.1.1 DSP Bypass
BIT 0 R/W R/W RST 0 NAME DSPB DESCRIPTION DSP Bypass Bit : 0 - Normal Operation 1 - Bypass of Biquad and Bass/Treble Functionality
Setting the DSPB bit bypasses the biquad and bass/treble functionality of the STA308. 3.1.2 Zero-Detect Mute Enable
BIT 1 R/W R/W RST 1 NAME ZDE DESCRIPTION Zero-Detect Mute Enable : Setting of 1 enables the automatic zero-detect mute
Setting the ZDE bit enables the zero-detect automatic mute. The zero-detect circuit looks at the input data to each processing channel after the channel mapping block. If any channel receives 2048 consecutive zero value samples (regardless of fs) then that individual channel is muted if this function is enabled.
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Serial Audio Input Interface Format
BIT 2 3 4 R/W R/W R/W R/W RST 0 0 0 NAME SAI0 SAI1 SAI2 DESCRIPTION Serial Audio Input Interface Format : Determines the interface format of the input serial digital audio interface.
The STA308 features a configurable digital serial audio interface. The settings of the SAIx bits determine how the input to this interface is interpreted. Six formats are accepted. Table 3. Interface format as a function of SAI bits.
SAI(2..0) 000 001 010 011 100 101 I2S Left-Justified Data Right-Justified 16-bit Data Right-Justified 18-bit Data Right-Justified 20-bit Data Right-Justified 24-bit Data Interface Format
Figure 2. Serial Audio Signals
SAI=000 I S
LRCLK Left Right
2
SCLK
SDATA
MSB
LSB
MSB
LSB
MSB
SAI=001 Left Justified
LRCLK Left Right
SCLK
SDATA
MSB
LSB
MSB
LSB
MSB
SAI=010 to 101 Right Justified
LRCLK Left Right
SCLK
SDATA
MSB
LSB
MSB
LSB
MSB
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3.1.3 Serial Audio Input Interface First Bit
BIT 5 R/W R/W RST 0 NAME SAIFB DESCRIPTION Determines MSB or LSB first for all SAI formats 0 - MSB First, 1 - LSB First
3.1.4 Zero-Crossing Volume Enable
BIT 6 R/W R/W RST 1 NAME ZCE DESCRIPTION Zero-Crossing Volume Enable : 1 - Volume adjustments will only occur at digital zero-crossings 0 - Volume adjustments will occur immediately
The ZCE bit enables zero-crossing volume adjustments. When volume is adjusted on digital zero-crossings, "zipper noise" is eliminated 3.1.5 Dynamic Range Compression/Anti-Clipping Bit
BIT 6 R/W R/W RST 0 NAME DRC DESCRIPTION Dynamic Range Compression/Anti-Clipping 0 - Limiters act in Anti-Clipping Mode 1- Limiters act in Dynamic Range Compression Mode
Both limiters can be used in one of two ways, anti-clipping or dynamic range compression. When used in anticlipping mode the limiter threshold values are constant and dependent on the gain/attenuation settings applied to the input signal. In dynamic range compression mode the limiter threshold values vary with the volume settings allowing for limiting to occur independently of the gain/attenuation but dependent on the input signal 3.2 Configuration Register C (address 02h)
BIT NAME RST D7 HPB 0 D6 CSZ4 1 D5 CSZ3 1 D4 CSZ2 1 D3 CSZ1 1 D2 CSZ0 1 D1 OM1 0 D0 OM0 0
3.2.1 DDX Power Output Mode
BIT 0 1 R/W R/W R/W RST 0 0 NAME OM0 OM1 DESCRIPTION DDX Power Output Mode : Selects configuration of DDX output.
The DDX Power Output Mode selects how the DDX output timing is configured. Different power devices use different output modes. The DDX recommended use is OM = 00. The variable mode uses the OMVx bits for adjustment
OM(1,0) 00 01 10 11 Output Stage - Mode Fixed Compensation for DDX-2060, DDX-2100 power amplifiers Tapered Compensation for Discrete Output Stage Full Power Mode Variable Compensation (CSZx bits, see 3.3.2)
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3.2.2 DDX Compensating Pulse Size Register
BIT 2 3 4 5 6 R/W R/W R/W R/W R/W R/W RST 1 1 1 1 1 NAME CSZ0 CSZ1 CSZ2 CSZ3 CSZ4 DESCRIPTION Contra Size Register : When OM(1,0) = 11, this register determines the size of the DDX compensating pulse from 0 clock ticks to 31 clock periods.
CSZ(4..0) 00000 00001 ... 11111
Compensating Pulse Size 0 Clock period Compensating Pulse Size 1 Clock period Compensating Pulse Size ... 31 Clock period Compensating Pulse Size
3.2.3 High-Pass Filter Bypass
BIT 7 R/W R/W RST 0 NAME HPB DESCRIPTION High-Pass Filter Bypass Bit. Setting of one bypasses internal AC coupling digital high-pass filter
The STA308 features an internal digital high-pass filter for the purpose of AC coupling. The purpose of this filter is to prevent DC signals from passing through a DDX amplifier. DC signals can cause speaker damage 3.3 Configuration Register D (address 03h)
BIT NAME RST D7 BQL 0 D6 PSL 0 D5 COS1 1 D4 COS0 0 D3 C78BO 0 D2 C56BO 0 D1 C34BO 0 D0 C12BO 0
3.3.1 Binary Output Enable Registers
BIT 0 1 2 3 R/W R/W R/W R/W R/W RST 0 0 0 0 NAME C12BO C34BO C56BO C78BO DESCRIPTION Channels 1&2, 3&4, 5&6, 7&8 Binary Output Mode Enable Bits. A setting of 0 indicates ordinary DDX tri-state output. A setting of 1 indicates binary output mode.
Each two-channel pair of outputs can be set to output a binary PWM stream. In this mode, output A of a channel will be considered the positive output and output B is negative inverse. For example, setting C34BO = 1 sets channels 3&4 to Binary Output (PWM) Mode. 3.3.2 Clock Output Select
BIT 4 5 R/W R/W R/W RST 0 1 NAME COS0 COS1 DESCRIPTION Clock Output Select Clock Output Select
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The Clock Output Select register selects the frequency of the clock output pin relative to the PLL clock output. The PLL clock runs at 2048fs for 32, 44.1, and 48kHz, at 1024fs for 88.2kHz and 96 kHz, and at 512fs for 176.4kHz and 192kHz.
COS(1,0) 01 10 11 CKOUT Frequency PLL Output/4 PLL Output/8 PLL Output/16
3.3.3 Post-Scale Link
BIT 6 R/W R/W RST 0 NAME PSL DESCRIPTION Post-Scale Link :0 - Each Channel uses individual Post-Scale value 1 - Each Channel uses Channel 1 Post-Scale value
For multi-channel applications, the post-scale values can be linked to the value of channel 1 for ease of use and update the values faster. 3.3.4 Biquad Coefficient Link
BIT 7 R/W R/W RST 0 NAME BQL DESCRIPTION Biquad Link : 0 - Each Channel uses coefficient values 1- Each Channel uses Channel 1 coefficient values
For ease of use, all channels can use the biquad coefficients loaded into the Channel 1 Coefficient RAM space by setting the BQL bit to 1. Then any EQ updates would only have to be performed once.
3.4 Configuration Register E (address 04h)
BIT NAME RST D7 DCV 0 D6 SAOFB 0 D5 SAO2 0 D4 SAO1 0 D3 SAO0 0 D2 DEMP 0 D1 VOLEN 1 D0 MIXE 0
BIT 0
R/W R/W
RST 0
NAME MIXE
DESCRIPTION Mix Enable: 0 - Normal Operation 1 - Adjacent Channel Mix Mode
The scale and mix functionality can be used to mix adjacent channels instead of for bass management. By setting this bit(BME must be set to 0) odd channels will be mixed with their adjacent even channel and output in the place of the even channel. The odd channel wills pass-through unscaled. The values used for this function are the same as for bass management. Since this function occurs post channel mapping a large number of possibilities are present for two channel mixing. Up to four mixed channels can be obtained.
BIT 1 R/W R/W RST 1 NAME VOLEN DESCRIPTION Volume Enable: 0 - Volume Operation Bypassed 1 - Volume Operation Normal
When VOLEN set to 1, volume operation is normal. When set to 0, volume operation is bypassed and the volume stages are all set to pass-through. This also eliminates the digital volume offset of ~-0.6dB that is used to
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map full-scale digital input to full DDX modulation output.
BIT 2 R/W R/W RST 0 NAME DEMP DESCRIPTION Deemphasis : 0 - No Deemphasis, 1- Deemphasis
By setting this bit to one deemphasis will implemented on all channels. When this is used it takes the place of biquad #1 in each channel and any coefficients using biquad #1 will be ignored. DSPB(DSP Bypass) bit must be set to 0 for Deemphasis to function.
BIT 3 4 5 R/W R/W R/W R/W RST 0 0 0 NAME SAO0 SAO1 SAO2 DESCRIPTION Serial Audio Output Interface Format : Determines the interface format of the output serial digital audio interface.
The STA308 features a configurable digital serial audio interface. The settings of the SAIx bits determine how the output to this interface is interpreted. Six formats are accepted. Table 4. Interface format as a function of SAO bits.
SAO(2..0) 000 001 010 011 100 101 I2S Left-Justified Data Right-Justified 16-bit Data Right-Justified 18-bit Data Right-Justified 20-bit Data Right-Justified 24-bit Data Interface Format
BIT 6
R/W R/W
RST 0
NAME SAOFB
DESCRIPTION Determines MSB or LSB first for all SAO formats; 0 - MSB First 1 - LSB First DESCRIPTION Distortion Compensation Variable: 0 - Use Standard DC Coefficient 1- Use DCC bits for DC Coefficient
BIT 7
R/W R/W
RST 0
NAME DCV
3.5 Configuration Register F (address 05h)
BIT NAME RST D7 EAPD 0 D6 D5 D4 D3 AME 0 D2 COD 0 D1 SID 0 D0 PWMD 0
BIT 0
R/W R/W
RST 0
NAME PWMD
DESCRIPTION PWM Output Disable: 0 - PWM Output Normal 1- No PWM Output
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1 R/W 0 SID Serial Interface(I2S Out) Disable: 0 - I2S Output Normal 1- No I2S Output Clock Output Disable: 0 - Clock Output Normal 1- No Clock Output AM Mode Enable : 0 - Normal DDX operation. 1 - AM reduction mode DDX operation.
2 3
R/W R/W
0 0
COD AME
The STA308 features a DDX processing mode that minimizes the amount of noise generated in frequency range of AM radio. This mode is intended to be used when DDX is operating in a device with an AM tuner active. The SNR of the DDX processing is reduced to ~83dB in this mode, which is still greater than the SNR of AM radio.
BIT 7 R/W R/W RST 0 NAME EAPD DESCRIPTION External Amplifier Power Down: 0 - External Power Stage Power Down Active 1 - Normal Operation
This output bit, on pin 51 of the device, is used to mute the DDX Power Devices for Power-Down. 3.6 Master Mute Register (address 06h)
BIT NAME RST D7 D6 D5 D4 D3 D2 D1 D0 MMUTE 0
3.7 Master Volume Register (address 07h)
BIT NAME RST D7 MV7 1 D6 MV6 1 D5 MV5 1 D4 MV4 1 D3 MV3 1 D2 MV2 1 D1 MV1 1 D0 MV0 1
3.8 Channels 1,2,3,4,5,6,7,8 Mute (address 08h)
BIT NAME RST D7 C8M 0 D6 C7M 0 D5 C6M 0 D4 C5M 0 D3 C4M 0 D2 C3M 0 D1 C2M 0 D0 C1M 0
3.9 Channel 1 Volume (address 09h)
BIT NAME RST D7 C1V7 0 D6 C1V6 0 D5 C1V5 1 D4 C1V4 1 D3 C1V3 0 D2 C1V2 0 D1 C1V1 0 D0 C1V0 0
3.10 Channel 2 Volume (address 0Ah)
BIT NAME RST D7 C2V7 0 D6 C2V6 0 D5 C2V5 1 D4 C2V4 1 D3 C2V3 0 D2 C2V2 0 D1 C2V1 0 D0 C2V0 0
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3.11 Channel 3 Volume (address 0Bh)
BIT NAME RST D7 C3V7 0 D6 C3V6 0 D5 C3V5 1 D4 C3V4 1 D3 C3V3 0 D2 C3V2 0 D1 C3V1 0 D0 C3V0 0
3.12 Channel 4 Volume (address 0Ch)
BIT NAME RST D7 C4V7 0 D6 C4V6 0 D5 C4V5 1 D4 C4V4 1 D3 C4V3 0 D2 C4V2 0 D1 C4V1 0 D0 C4V0 0
3.13 Channel 5 Volume (address 0Dh)
BIT NAME RST D7 C5V7 0 D6 C5V6 0 D5 C5V5 1 D4 C5V4 1 D3 C5V3 0 D2 C5V2 0 D1 C5V1 0 D0 C5V0 0
3.14 Channel 6 Volume (address 0Eh)
BIT NAME RST D7 C6V7 0 D6 C6V6 0 D5 C6V5 1 D4 C6V4 1 D3 C6V3 0 D2 C6V2 0 D1 C6V1 0 D0 C6V0 0
3.15 Channel 7 Volume (address 0Fh)
BIT NAME RST D7 C7V7 0 D6 C7V6 0 D5 C7V5 1 D4 C7V4 1 D3 C7V3 0 D2 C7V2 0 D1 C7V1 0 D0 C7V0 0
3.16 Channel 8 Volume (address 10h)
BIT NAME RST D7 C8V7 0 D6 C8V6 0 D5 C8V5 1 D4 C8V4 1 D3 C8V3 0 D2 C8V2 0 D1 C8V1 0 D0 C8V0 0
The Volume structure of the STA308 consists of individual volume registers for each channel and a master volume register that provides an offset to each channels volume setting. The individual channel volumes are adjustable in 0.5dB steps from +24dB to -103dB. As an example if C5V = 0Bh or +18.5dB and MV = 21h or 16.5dB, then the total gain for channel 5 = +2dB. The Master Mute when set to 1 will mute all channels at once, whereas the individual channel mutes(CxM) will mute only that channel. Both the Master Mute and the Channel Mutes provide a "soft mute" with the volume ramping down to mute in 8192 samples from the maximum volume setting at the internal processing rate(~192kHz). A "hard mute" can be obtained by commanding a value of all 1's(255) to any channel volume register or the master volume register. When volume offsets are provided via the master volume register any channel that whose total volume is less than -103dB will be muted. All changes in volume take place at zero-crossings when ZCE = 1(configuration register B) on a per channel basis as this creates the smoothest possible volume transitions. When ZCE=0, volume updates will occur immediately.
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Table 5. Master Volume Offset as a function of MV(7..0).
MV(7..0) 00000000(00h) 00000001(01h) 00000010(02h) ... 01001100(4Ch) ... 11111110(FEh) 11111111(FFh) Volume Offset from Channel Value 0dB -0.5dB -1dB ... -38dB ... -127dB Hard Master Mute
Channel Volume as a function of CxV(7..0)
CxV(7..0) 00000000(00h) 00000001(01h) 00000010(02h) ... 00101111(2Fh) 00110000(30h) 00110001(31h) ... 11111110(FEh) 11111111(FFh) Volume +24dB +23.5dB +23dB ... +0.5dB 0dB -0.5dB ... -103dB Hard Channel Mute
3.17 Channel Input Mapping Channels 1 & 2 (address 11h)
BIT NAME RST D7 D6 C2IM2 0 D5 C2IM1 0 D4 C2IM0 1 D3 D2 C1IM2 0 D1 C1IM1 0 D0 C1IM0 0
3.18 Channel Input Mapping Channels 3 & 4 (address 12h)
BIT NAME RST D7 D6 C4IM2 0 D5 C4IM1 1 D4 C4IM0 1 D3 D2 C3IM2 0 D1 C3IM1 1 D0 C3IM0 0
3.19 Channel Input Mapping Channels 5 & 6 (address 13h)
BIT NAME RST D7 D6 C6IM2 1 D5 C6IM1 0 D4 C6IM0 1 D3 D2 C5IM2 1 D1 C5IM1 0 D0 C5IM0 0
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3.20 Channel Input Mapping Channels 7 & 8 (address 14h)
BIT NAME RST D7 D6 C8IM2 1 D5 C8IM1 1 D4 C8IM0 1 D3 D2 C7IM2 1 D1 C7IM1 1 D0 C7IM0 0
Each channel received via I2S can be mapped to any internal processing channel via the Channel Input Mapping registers. This allows for flexibility in processing, simplifies output stage designs, and enables the ability to perform crossovers. The default settings of these registers map each I2S input channel to its corresponding processing channel. For example, to map input 2 to Channel 5, set Address 11h, bits D6, D5 and D4 to 100. Now, inputs 2 and 5 go to Channel 5. Table 6. Channel Mapping as a function of CxIM bits
CxIM(2..0) 000 001 010 011 100 101 110 111 I2S Input Mapped to: Channel 1 Channel 2 Channel 3 Channel 4 Channel 5 Channel 6 Channel 7 Channel 8
Channel 1 Channel 2 Channel 3 Channel 4 Channel 5 Channel 6 Channel 7 Channel 8 CxIM(2..0)
3
8:1 Mux
Channel X
DDX-8000 Output Phasing
CH1
CH2
CH3
CH4
CH5
CH6
CH7
CH8
1/384kHz or 2.874us
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3.21 Channel Limiter Select Channels 1,2,3,4 (address 15h)
BIT NAME RST D7 C4LS1 0 D6 C4LS0 0 D5 C3LS1 0 D4 C3LS0 0 D3 C2LS1 0 D2 C2LS0 0 D1 C1LS1 0 D0 C1LS0 0
3.22 Channel Limiter Select Channels 5,6,7,8 (address 16h)
BIT NAME RST D7 C8LS1 0 D6 C8LS0 0 D5 C7LS1 0 D4 C7LS0 0 D3 C6LS1 0 D2 C6LS0 0 D1 C5LS1 0 D0 C5LS0 0
3.23 Limiter 1 Attack/Release Rate (address 17h)
BIT NAME RST D7 L1R3 1 D6 L1R2 0 D5 L1R1 1 D4 L1R0 0 D3 L1A3 0 D2 L1A2 1 D1 L1A1 1 D0 L1A0 0
3.24 Limiter 1 Attack/Release Threshold (address 18h)
BIT NAME RST D7 L1AT3 0 D6 L1AT2 1 D5 L1AT1 1 D4 L1AT0 0 D3 L1RT3 0 D2 L1RT2 1 D1 L1RT1 1 D0 L1RT0 1
3.25 Limiter 2 Attack/Release Rate (address 19h)
BIT NAME RST D7 L2R3 1 D6 L2R2 0 D5 L2R1 1 D4 L2R0 0 D3 L2A3 0 D2 L2A2 1 D1 L2A1 1 D0 L2A0 0
3.26 Limiter 2 Attack/Release Threshold (address 1Ah)
BIT NAME RST D7 L2AT3 0 D6 L2AT2 1 D5 L2AT1 1 D4 L2AT0 0 D3 L2RT3 0 D2 L2RT2 1 D1 L2RT1 1 D0 L2RT0 1
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Basic Limiter and Volume Flow Diagram.
Limiter
RMS
Gain/Volume
Input Gain Attenuation Saturation
Output
A limiter is basically a variable gain device, where the amount of gain applied depends on the input signal level. As the name implies, compression limits the dynamic range of the signal. The STA308 includes 2 independent limiter blocks. The purpose of the limiters is to automatically reduce the dynamic range of the input signal to prevent the outputs from clipping in anti-clipping mode or to actively reduce the dynamic range for a better listening environment such as a night-time listening mode which is often needed for DVDs. The two modes are selected via the DRC bit in Configuration Register B; address 0x02, bit 7. Each channel can be mapped to either limiter or not mapped. Non-mapped channels will clip when 0dBFS is exceeded. Each limiter will look at the present value of each channel that is mapped to it, select the maximum absolute value of all these channels, perform the limiting algorithm on that value, and then, if needed, adjust the gain of the mapped channels in unison. The limiter attack thresholds are determined by the LxAT registers. It is recommended in anti-clipping mode to set this to 0dBFS, which corresponds to the maximum unclipped output power of a DDX amplifier. Since gain can be added digitally within the STA308 it is possible to exceed 0dBFS or any other LxAT setting. When this occurs, the limiter, when active, will automatically start reducing the gain. The rate at which the gain is reduced when the attack threshold is exceeded is dependent upon the attack rate register setting for that limiter. The gain reduction occurs on a peak-detect algorithm. The release of limiter (uncompression), when the gain is again increased, is dependent on a RMS-detect algorithm. The output of the volume/limiter block is passed through a RMS filter. The output of this filter is compared to the release threshold, determined by the Release Threshold register. When the RMS filter output falls below the release threshold, the gain is again increased (uncompressed) at a rate dependent upon the Release Rate register. The gain can never be increased past its set value and therefore the release will only occur if the limiter has already reduced the gain. The release threshold value can be used to set what is effectively a minimum dynamic range, this is helpful as over-limiting can reduce the dynamic range to virtually zero and cause program material to sound "lifeless". In AC mode the attack and release thresholds are set relative to full-scale. In DRC mode the attack threshold is set relative to the maximum volume setting of the channels mapped to that limiter and the release threshold is set relative to the maximum volume setting plus the attack threshold. Table 7. Channel Limiter Mapping as a function of CxLS bits.
CxLS(1,0) 00 01 10 Channel Limiter Mapping Channel has limiting disabled Channel is mapped to limiter #1 Channel is mapped to limiter #2
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Table 8. Limiter Attack Rate as a function of LxA bits.
LxA(3..0) 0001 0010 0011 LxA(3..0) 0000 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111
note: Shaded areas are Default Settings
Attack Rate dB/ms
1.3536 0.9024 0.4512 0.2256 0.1504 0.1123 0.0902 0.0752 0.0645 0.0564 0.0501 0.0451
Table 9. Limiter Release Rate and Uncompression Threshold as a function of LxR bits
LxR(3..0) 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111 Release Rate dB/ms 0.5116 0.1370 0.0744 0.0499 0.0360 0.0299 0.0264 0.0208 0.0198 0.0172 0.0147 0.0137 0.0134 0.0117 0.0110 0.0104
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Table 10. Limiter Attack Threshold as a function of LxAT bits.
LxAT(3..0) 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111 AC(dB relative to FS) -12 -10 -8 -6 -4 -2 0 +2 +3 +4 +5 +6 +7 +8 +9 +10 DRC(db relative to Volume) -22 -20 -18 -16 -14 -12 -10 -8 -7 -6 -5 -4 -3 -2 -1 0
Table 11. Limiter Release Threshold as a function of LxRT bits
LxRT(3..0) 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111 AC(dB relative to FS) * -23dB -16.9dB -13.4dB -10.9dB -9.0dB -7.4dB -6.0dB -4.9dB -3.8dB -2.9dB -2.1dB -1.3dB -0.65dB 0dB +0.6dB DRC(db relative to Volume + LxAT) * -33dB -26.9dB -23.4dB -20.9dB -19.0dB -17.4dB -16.0dB -14.9dB -13.8dB -12.9dB -12.1dB -11.3dB -10.65dB -10dB -9.4dBdB
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3.27 Bass and Treble Tone Control(address 1Bh)
BIT NAME RST D7 TTC3 0 D6 TTC2 1 D5 TTC1 1 D4 TTC0 1 D3 BTC3 0 D2 BTC2 1 D1 BTC1 1 D0 BTC0 1
The STA308 contains bass and treble tone control adjustments. These are selectable from +12dB to -12dB of boost or cut. These are 1st order shelving filters with a corner frequency of 150Hz for bass and 3kHz for treble. Any gain introduced in the tone controls will carry through to the volume and limiting block without saturation. Table 12. Tone Control Boost/Cut as a function of BTC and TTC bits
BTC(3..0)/TTC(3..0) 0000 0001 ... 0111 0110 0111 1000 1001 ... 1101 1110 1111 Boost/Cut -12dB -12dB ... -4dB -2dB 0dB +2dB +4dB ... +12dB +12dB +12dB
3.28 Coefficient Address Register (address 1Ch)
BIT NAME RST D7 CFA7 0 D6 CFA6 0 D5 CFA5 0 D4 CFA4 0 D3 CFA3 0 D2 CFA2 0 D1 CFA1 0 D0 CFA0 0
3.29 Coefficient b2 Data Register Bits 23..16 (address 1Dh)
BIT NAME RST D7 C1B23 0 D6 C1B22 0 D5 C1B21 0 D4 C1B20 0 D3 C1B19 0 D2 C1B18 0 D1 C1B17 0 D0 C1B16 0
3.30 Coefficient b2 Data Register Bits 15..8 (address 1Eh)
BIT NAME RST D7 C1B15 0 D6 C1B14 0 D5 C1B13 0 D4 C1B12 0 D3 C1B11 0 D2 C1B10 0 D1 C1B9 0 D0 C1B8 0
3.31 Coefficient b2 Data Register Bits 7..0 (address 1Fh)
BIT NAME RST D7 C1B7 0 D6 C1B6 0 D5 C1B5 0 D4 C1B4 0 D3 C1B3 0 D2 C1B2 0 D1 C1B1 0 D0 C1B0 0
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3.32 Coefficient b0 Data Register Bits 23..16 (address 20h)
BIT NAME RST D7 C2B23 0 D6 C2B22 0 D5 C2B21 0 D4 C2B20 0 D3 C2B19 0 D2 C2B18 0 D1 C2B17 0 D0 C2B16 0
3.33 Coefficient b0 Data Register Bits 15..8 (address 21h)
BIT NAME RST D7 C2B15 0 D6 C2B14 0 D5 C2B13 0 D4 C2B12 0 D3 C2B11 0 D2 C2B10 0 D1 C2B9 0 D0 C2B8 0
3.34 Coefficient b0 Data Register Bits 7..0 (address 22h)
BIT NAME RST D7 C2B7 0 D6 C2B6 0 D5 C2B5 0 D4 C2B4 0 D3 C2B3 0 D2 C2B2 0 D1 C2B1 0 D0 C2B0 0
3.35 Coefficient a2 Data Register Bits 23..16 (address 23h)
BIT NAME RST D7 C3B23 0 D6 C3B22 0 D5 C3B21 0 D4 C3B20 0 D3 C3B19 0 D2 C3B18 0 D1 C3B17 0 D0 C3B16 0
3.36 Coefficient a2 Data Register Bits 15..8 (address 24h)
BIT NAME RST D7 C3B15 0 D6 C3B14 0 D5 C3B13 0 D4 C3B12 0 D3 C3B11 0 D2 C3B10 0 D1 C3B9 0 D0 C3B8 0
3.37 Coefficient a2 Data Register Bits 7..0 (address 25h)
BIT NAME RST D7 C3B7 0 D6 C3B6 0 D5 C3B5 0 D4 C3B4 0 D3 C3B3 0 D2 C3B2 0 D1 C3B1 0 D0 C3B0 0
3.38 Coefficient a1 Data Register Bits 23..16 (address 26h)
BIT NAME RST D7 C4B23 0 D6 C4B22 0 D5 C4B21 0 D4 C4B20 0 D3 C4B19 0 D2 C4B18 0 D1 C4B17 0 D0 C4B16 0
3.39 Coefficient a1 Data Register Bits 15..8 (address 27h)
BIT NAME RST D7 C4B15 0 D6 C4B14 0 D5 C4B13 0 D4 C4B12 0 D3 C4B11 0 D2 C4B10 0 D1 C4B9 0 D0 C4B8 0
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3.40 Coefficient a1 Data Register Bits 7..0 (address 28h)
BIT NAME RST D7 C4B7 0 D6 C4B6 0 D5 C4B5 0 D4 C4B4 0 D3 C4B3 0 D2 C4B2 0 D1 C4B1 0 D0 C4B0 0
3.41 Coefficient b1 Data Register Bits 23..16 (address 29h)
BIT NAME RST D7 C5B23 0 D6 C5B22 0 D5 C5B21 0 D4 C5B20 0 D3 C5B19 0 D2 C5B18 0 D1 C5B17 0 D0 C5B16 0
3.42 Coefficient b1 Data Register Bits 15..8 (address 2Ah)
BIT NAME RST D7 C5B15 0 D6 C5B14 0 D5 C5B13 0 D4 C5B12 0 D3 C5B11 0 D2 C5B10 0 D1 C5B9 0 D0 C5B8 0
3.43 Coefficient b1 Data Register Bits 7..0 (address 2Bh)
BIT NAME RST D7 C5B7 0 D6 C5B6 0 D5 C5B5 0 D4 C5B4 0 D3 C5B3 0 D2 C5B2 0 D1 C5B1 0 D0 C5B0 0
3.44 Coefficient Write Control Register (address 2Ch)
BIT NAME RST D7 D6 D5 D4 D3 D2 D1 WA D0 W1
Coefficients for EQ and Bass Management are handled internally in the STA308 via RAM. Access to this RAM is available to the user via an I2C register interface. A collection of I2C registers is dedicated to this function. One contains a coefficient base address, five sets of three store the values of the 24-bit coefficients to be written or that were read, and one contains bits used to control the writing of the coefficient(s) to RAM. The following are step instructions for reading and writing coefficients. Reading a coefficient from RAM - write 8-bit address to I2C register 1Ch - ead top 8-bits of coefficient in I2C address 1Dh - ead middle 8-bits of coefficient in I2C address 1Eh - ead bottom 8-bits of coefficient in I2C address 1Fh Writing a single coefficient to RAM - write 8-bit address to I2C register 1Ch - write top 8-bits of coefficient in I2C address 1Dh - write middle 8-bits of coefficient in I2C address 1Eh - write bottom 8-bits of coefficient in I2C address 1Fh - write 1 to W1 bit in I2C address 2Bh
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Writing a set of coefficients to RAM - write 8-bit starting address to I2C register 1Ch - write top 8-bits of coefficient b2 in I2C address 1Dh - write middle 8-bits of coefficient b2 in I2C address 1Eh - write bottom 8-bits of coefficient b2 in I2C address 1Fh - write top 8-bits of coefficient b0 in I2C address 20h - write middle 8-bits of coefficient b0 in I2C address 21h - write bottom 8-bits of coefficient b0 in I2C address 22h - write top 8-bits of coefficient a2 in I2C address 23h - write middle 8-bits of coefficient a2 in I2C address 24h - write bottom 8-bits of coefficient a2 in I2C address 25h - write top 8-bits of coefficient a1 in I2C address 26h - write middle 8-bits of coefficient a1 in I2C address 27h - write bottom 8-bits of coefficient a1 in I2C address 28h - write top 8-bits of coefficient b1 in I2C address 29h - write middle 8-bits of coefficient b1 in I2C address 2Ah - write bottom 8-bits of coefficient b1 in I2C address 2Bh - write 1 to WA bit in I2C address 2Ch The mechanism for writing a set of coefficients to RAM provides a method of updating the five coefficients corresponding to a given biquad (filter) simultaneously to avoid possible unpleasant acoustic side effects. When using this technique, the 8-bit address would specify the address of the biquad b2 coefficient (e.g. 0, 5, 10, 15, ..., 50, ... 195 decimal), and the STA308 will generate the RAM addresses as offsets from this base value to write the complete set of coefficient data. Equalization: Figure 3. Data Flow for single channel Biquad / Bass / Treble block.:
From 1st Interpolation Stage To Volume/ Limiter
PreScale
Biquad1
Biquad2
Biquad3
Biquad4
Biquad5
Bass/ Treble
Five user-programmable 28-bit biquads are available per channel in the STA308. These biquads run at 192kHz for 48kHz, 96kHz, or 192kHz input and at 176.4kHz for 44.1kHz, 88.2kHz, and 176.4kHz input. The PreScale block is used for attenuation when filters are to be designed that boost frequencies above 0dBFS. This is a single 28-bit signed multiply, with 800000h = -1 and 7FFFFFh = 0.9999998808. These values are labeled CxPS, with x representing the channel. The biquads use this equation: Y[n] = 2(b0/2)X[n] + 2(b1/2)X[n-1] + b2X[n-2] - 2(a1/2)Y[n-1] - a2Y[n-2] = b0X[n] + b1X[n-1] + b2X[n-2] - a1Y[n-1] - a2Y[n-2]
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Y[n] represents the output and X[n] represents the input. Coefficients are defined in the following manner: CxHx0 = b2 CxHx1 = b0/2 CxHx2 = -a2 CxHx3 = -a1/2 CxHx4 = b1/2 The first x represents the channel and the second the biquad number. For example C3H41 is the b0/2 coefficient in the fourth series biquad in channel 3. The biquad link bit allows all channels to use the coefficients of channel 1. Bass Management Channel 6 provides the ability to scale and mix all channels before the biquad block. This allows for information from any channel to be redirected to this channel and then filtered appropriately for a subwoofer application. When the BME bit is set (bit D5 of Configuration Register A, at address 00h) the input to the biquad section is routed from the scale and mix block instead of the normal channel 6 1st stage interpolation output. Eight scaling coefficients are provided to perform this function. They are labeled CxBMS with x representing the channel that is being scaled. Each input channel is multiplied by its corresponding scale factor and summed. The output of the summation is the output of the scale and mix block. Post-Scale The STA308 provides one additional multiplication after the last interpolation stage and before the distortion compensation on each channel. This is a 24-bit signed fractional multiply. The scale factor for this multiply is loaded into RAM using the same I2C registers as the biquad coefficients and the bass-management. All channels can use the channel 1 by setting the post-scale link bit. RAM Block for Biquads and Bass Management:
Index (Decimal) 0 1 2 3 4 5 ... 24 25 26 ... Index (Hex) 00h 01h 02h 03h 04h 05h ... 18h 19h 1Ah ... ... Channel 1 - Biquad 2 ... Channel 1 - Biquad 5 Channel 2 - Biquad 1 Channel 1 - Biquad 1 Coefficient C1H10(b2) C1H11(b0/2) C1H12(a2) C1H13(a1/2) C1H14(b1/2) C1H20 ... C1H54 C2H10 C2H11 ... Default 000000h 3FFFFFh 000000h 000000h 000000h 000000h ... 000000h 000000h 3FFFFFh ...
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45 ... 49 50 ... 199 200 201 202 ... 207 208 209 ... 215 216 217 ... 223 224 ... 255 2Dh ... 31h 32h ... C7h C8h C9h CAh ... CFh D0h D1h ... D7h D8h D9h ... DFh F0h ... FFh Distortion Compensation ... Channel 2 - Biquad 5 Channel 3 - Biquad 1 ... Channel 8 - Biquad 5 Channel 1 - Pre-Scale Channel 2 - Pre-Scale Channel 3 - Pre-Scale ... Channel 8 -Pre-Scale Channel 1 - BassM Scale Channel 2 - BassM Scale ... Channel 8 - BassM Scale Channel 1 - Post-Scale Channel 2 - Post-Scale ... Channel 8 - Post-Scale Not Used ... Not Used ... ... DCC 23...0 ... C2H54 C3H10 ... C8H54 C1PS C2PS C3PS ... C8PS C1BMS C2BMS ... C8BMS C1PS C2PS ... C8PS 000000h ... 000000h 000000h ... 000000h 800000h 800000h 800000h ... 800000h 000000h 000000h ... 000000h 800000h 800000h ... 800000h
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DIM. MIN. A A1 A2 B C D D1 D3 e E E1 E3 L L1 K 0.40 0.05 1.35 0.18 0.12
mm TYP. MAX. 1.60 0.15 1.40 0.23 0.16 12.00 10.00 7.50 0.50 12.00 10.00 7.50 0.60 1.00 0(min.), 7(max.) 0.75 1.45 0.28 0.20 0.002 0.053 0.007 MIN.
inch TYP. MAX. 0.063 0.006 0.055 0.009 0.057 0.011
OUTLINE AND MECHANICAL DATA
0.0047 0.0063 0.0079 0.472 0.394 0.295 0.0197 0.472 0.394 0.295 0.0157 0.0236 0.0295 0.0393
TQFP64
D D1 A D3 A1 48 49 33 32
0.10mm Seating Plane
A2
B
E3
E1
64 1 e 16
17 C
L1
E
L
K
TQFP64
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B
STA308
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics 2002 STMicroelectronics - All Rights Reserved
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