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DS4201 USB Audio DAC
www.dalsemi.com
FEATURES
Fully USB Core Class v1.0 Compliant Fully USB Audio Device Class v1.0 Compliant Complete Stereo DAC System 16-bit DAC Analog Post Filter 44.1 KHz, 48 KHz Sampling Rates >80 dB S/N DAC Performance Audio System Power Management 8 and 16-Bit PCM Digital Data Formats Integrated USB Compliant Transceiver High Rate 12 Mbps USB Interface Analog Output Mixing for Auxiliary Inputs Multiple Power Configurations Including Completely USB Powered 3.3V - 5.0V Operating Range
PIN ASSIGNMENT
VD NC NC DGND SPM X2I X2O DGND X1I X1O VB DD+ DGND 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 NC NC NC SUSO VCM VREFI VA AGND LOUT ROUT LMIC RMIC LAUX RAUX
28-PIN DIP 600 MIL
NC DGND NC NC VD NC NC NC NC SUSO NC 44 1 ALE WR RLINK RLCLK DVSS RCLK RCHCLK RSER RSYNC RLOS/LOTC SYSCLK 11 12 VB DNC D+ DGND NC NC RAUX LAUX RMIC LMIC 44-PIN QFP (10mm x 10mm) 34 33 NC NC VCM NC VREGI VA NC AGND LOUT NC ROUT 23 22
ORDERING INFORMATION
Part Number DS4201 DS4201F Description 28-pin DIP 44-pin QFP
DESCRIPTION
The DS4201 Universal Serial Bus (USB) audio device is a complete interface solution for USB based PC digital audio playback. Integrating a USB device core, stereo 16-bit sigma-delta DAC and fixed function DSP processing, as shown in Figure 1, the DS4201 is designed specifically for USB digital speaker implementations. Digital-to-analog audio data processing supports 8 and 16-bit PCM stereo/mono formats at 44.1 KHz and 48.0 KHz sampling rates. Additionally, analog output mixing of line and microphone inputs provide legacy and hybrid speaker capabilities.
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The DS4201 USB function core fully complies with both the USB Specification v1.0 and the USB Device Class Definition for Audio Devices v1.0. To complete the USB capability of the DS4201, a USB compliant transceiver is integrated to eliminate the need for any additional support chips. Organization of the DS4201 in an USB context is shown in Figure 2. For the USB enabled PC, the DS4201 is an ideal digital output solution for high quality audio and control within the speaker or monitor enclosure. Its USB control and capabilities as well as its high quality audio characteristics also comply with next generation PC system and audio standards put forth by industry leaders.
RELATED DOCUMENTS
This data sheet references or complies with the following USB specifications which are considered to be part of the DS4201 device specification. These documents may be obtained from the USB Implementers Forum web site: www.usb.org. Universal Serial Bus Specification Universal Serial Bus Device Class Definition for Audio Devices
FUNCTIONAL BLOCK DIAGRAM Figure 1
SIGNAL SUMMARY
SIGNAL NAME D+ DSPM
SUSO
TYPE I/O I/O I O
FUNCTION USB data - non-inverted signal of differential data pair. USB data - inverted signal of differential data pair. Suspend Power Mode - controls device power configuration when a USB suspend state is entered. Suspend Output - buffered USB suspend state output from USB device core. When HIGH the USB is in an active non-suspended state, when LOW the USB has entered a suspended state. This is an open drain output and requires a pull-up. Microphone right channel analog input to the analog output mixer. Microphone left channel analog input to the analog output mixer. 2 of 24 102099
RMIC LMIC
I I
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SIGNAL NAME RAUX LAUX ROUT LOUT VCM VREFI
TYPE I I O O O I
FUNCTION Auxiliary right channel analog input to the analog output mixer. Auxiliary left channel analog input to the analog output mixer. Right channel analog audio output from the mixer, 0.5 VRMS or 1.0 VRMS centered about VREF. Left channel analog audio output from the mixer, 0.5 VRMS or 1.0 VRMS centered about VREF. DC bias point to which all AC coupled inputs are centered. Nominally V REF = 0.4 x VA. Filter capacitor connection for internal voltage reference node. Connect a 10F and 0.1F capacitor to VREFI, very close to the pin, for best operation. Power supply input for analog functions. Range: 3.0 - 5.5V. Power supply input for digital functions. Range: 3.0 - 5.5V. USB I/F power supply input. Range: 3.0 - 3.6V. Digital ground. Analog ground. Crystal 1 input. Use a 12.0 MHz, fundamental mode, parallel resonant crystal. A 12.0 MHz CMOS clock source may also be used. Crystal 1 output. Connect to other side of crystal 1 if used. Crystal 2 input. Use a 12.888 MHz, fundamental mode, parallel resonant crystal. A 12.288 MHz CMOS clock source may also be used. Crystal 2 output. Connect to other side of crystal 2 if used. No connect. Leave these pins unconnected.
VA VD VB DGND AGND X1I X10 X2I
I I I I I I O I
X2O NC
O
DS4201 OPERATION
Operation of the DS4201 is described per the block diagram of Figure 2 and is divided into six sections: * USB DEVICE * USB TRANSCEIVER * VOLTAGE REFERENCE * ANALOG I/O * POWER CONTROL * OSCILLATORS The following sections provide details regarding the operation of each of these elements. Additionally, APPENDIX C provides recommended connection information.
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USB defined descriptors are passed to the host from the DS4201; these are used to communicate what capabilities and features are supported by the DS4201 as well as device characteristics. Contact Dallas Semiconductor for additional device descriptor documentation.
USB DEVICE OPERATION
As shown in Figure 1 and Figure 2, within the USB Device block resides the sigma-delta D/A converter for audio data playback, level adjustments for the D/A, microphone, and auxiliary signal paths, and mixing of the three signal channels to a single line output channel. Organization and control of these elements as well as the interface to the host controller in an USB Audio Device Class (ADC) framework is shown in Figure 3. This structure provides all the capabilities for the host system to communicate with and operate the various features within the DS4201. As shown in Figure 3, theDS4201 USB device structure will consist of one default device configuration, one AUDIO CONTROL interface, and one AUDIO STREAMING interface. The details of these interfaces are provided in the following paragraphs.
OPERATIONAL BLOCK DIAGRAM Figure 2
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USB DEVICE STRUCTURE Figure 3
NOTE:
For the audio streaming interface alternate setting which selects adaptive synchronization, the isochronous synch pipe at endpoint 2 (EP2) does not exist.
AUDIO CONTROL INTERFACE
The CONTROL interface is used by the USB host to manipulate and monitor the operation of the DS4201. Additionally, all features, control capabilities, and characteristics of the DS4201 are communicated to the host through USB descriptors over this interface. Host communication with the CONTROL interface is performed over a default control pipe at Endpoint 0. The USB Audio Device Class (ADC) specification defines audio function units and terminals to describe and operate a USB Audio device; the Endpoint 0 default control pipe is used to control the units and terminals. USB operation of the DS4201 Audio device is controlled through Feature Units (FU), a Mixer Unit (MU), Input Terminals (IT), an Extension Unit (XU), and an Output Terminal (OT) as shown in Figure 3. The Input Terminal associated with the STREAMING INTERFACE makes a logical connection to the isochronous data pipe feeding PCM coded data to the DS4201 at Endpoint 1. The DS4201 performs D/A processing of the incoming digital PCM data at this point and thus the output from this Input Terminal is a logical cluster of analog audio signals consisting of the left and right audio channels. The Input Terminals associated with the Auxiliary (AUX) and Microphone (MIC) inputs are for connection to the analog line inputs; the output from these terminals are logical clusters of the respective analog audio input source. The three Feature Units (FU) provide Mute capability for the three analog audio clusters. The Extension Unit (XU) provides a DS4201 specific control capability which can be used to select between two output level ranges from the sigma-delta D/A converter. The Mixer Unit (MU) provides control for level setting and mixing of the three analog audio clusters; the control capability consists of gain or attenuation to the incoming analog signals prior to mixing the left and right composite channels.
INPUT TERMINALS
The ADC Input Terminal (IT) is used to receive audio information into the audio function. It also converts the incoming audio stream into the separate logical channels embedded. USB OUT endpoints as well as analog audio inputs are supported. The DS4201 uses three ITs: IT:TID1 connects to Endpoint 1 carrying a USB isochronous audio stream, IT:TID2 connects to the analog AUX input, and IT:TID3 connects to the analog MIC input. 5 of 24 102099
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EXTENTION UNIT
The extension Unit (XU) is used to add vendor specific features to a USB audio function. The XU in the DS4201, XU:UID9, is used to select between two available output ranges for the sigma-delta DAC: 1.414 VPP or 2.828 VPP The XU control parameter, OUTPUT_ DOUBLE_CONTROL, is used to select or enable the output range mode. When set TRUE, the 2.828 VPP range is selected; when FALSE, the 1.414 VPP range is selected. When the DS4201 is operating from a 3V power source, the 1.414 VPP range must be selected. For 5V operation, either range can be used. The command and control parameter used for the XU SET/GET request is defined in APPENDIX A.
EXTENTION UNIT DEFAULT SETTING
The power-on default setting of the XU is: OUTPUT_DOUBLE_SELECTOR = FALSE (DAC output range = 1.414 VPP)
Feature Units
As defined by the ADC specification, the Feature Unit (FU) provides basic property control of an audio signal. The FU descriptor reports what controls exist for each channel that passes through the FU as well as a master control. All FUs have a single input and output pin for the audio cluster being controlled. The audio cluster can contain multiple logical channels (left, right, etc.) which are individually or group controlled by FU commands. As shown in Figure 3, FU:UID5 operates on the cluster from XU:UID9, FU:UID6 operates on the cluster from IT:TID2 and FU:UID7 operates on the cluster from IT:TID3. Table 1 lists the cluster channels and properties supported by each FU. As shown in the table, MUTE is the only control property supported by the DS4201 FUs. FU commands are documented in APPENDIX A.
FEATURE UNIT PROPERTIES Table 1
FEATURE UNIT LOGICAL CHANNEL FU:UID5 Channel 0 FU:UID5 Channel 1 FU:UID5 Channel 2 FU:UID6 Channel 0 FU:UID6 Channel 1 FU:UID6 Channel 2 FU:UID7 Channel 0 FU:UID7 Channel 1 FU:UID7 Channel 2 SIGNAL Master Left DAC Right DAC Master Left AUX Right AUX Master Left MIC Right MIC SUPPORTED PROPERTIES MUTE MUTE MUTE MUTE MUTE MUTE MUTE MUTE MUTE
FEATURE UNITS DEFAULT SETTINGS
The power-on default settings of the three FU' are: s FU:UID5 - Channels 0-2, MUTE = false FU:UID6 - Channels 0-2, MUTE = false FU:UID7 - Channels 0-2, MUTE = false 6 of 24 102099
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MIXER UNIT
The ADC Mixer Unit (MU) definition provides the mixer with capability to mix all input channels into all output channels. In addition, mixing controls can be programmable or fixed. The MU descriptor reports channel mixing, control capability, and input signal source information to the host. As with all ADC audio units, the input pins and output pin of the MU connect to audio signal clusters; the clusters are made up of logical channels which enter or exit the MU. The DS4201 MU, MU:UID8, has 3 input clusters, each of which has 2 logical channels, and 1 output cluster with 2 logical channels. Thus there are 6 logical inputs and 2 logical outputs. For this arrangement, the ADC MU defines a mixing capability that consists of 12 controls (6 input channels x 2 output channels). The MU descriptor field, bmControls, is used to indicate available programmable mixing controls. The value for the bmControls field is built from a two dimensional array which contains a row for each logical input channel and a column for each logical output channel. For a given array element, bmControl[u,v], if [u,v] is set a programmable mixing control exists for input u to output v, if [u,v] is clear the connection is non-programmable and its fixed value can be retrieved through a MU request. The array corresponding to the DS4201 mixing capability is shown in Table 2. For the DS4201, the array indicates the programmable mixing capability of left input channels with the left out-put channel and likewise for right channels. The value for the bmControl field is built from the values in Table 2 according to the method outlined in the ADC specification. For the DS4201 the field is comprised of two bytes with values of: 0x99, 0x90.
bmCONTROL ARRAY FOR MU:UID8 Table 2
OUTPUT CHANNEL 1 INPUT CHANNEL 1 (DAC-L) 2 (DAC-R) 3 (AUX-L) 4 (AUX-R) 5 (MIC-L) 6 (MIC-R) (OUT-L) 1 0 1 0 1 0 2 (OUT-R) 0 1 0 1 0 1
For programmable mixer controls, the ADC provides request commands to obtain the maximum and minimum settings available for each control as well as control setting resolution. Programmable control ranges and resolutions are shown in Table 3. MU commands are documented in APPENDIX A.
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MU:UID8 CONTROL RANGE Table 3
INPUT CLUSTER DAC AUX MIC MIN -96.0 dB (0xA000) -32 dB (0xE000) -32 dB (0xE000) MIXER CONTROL RANGE MAX 0.0 dB (0x0000) 30.0 dB (0x1E00) 30.0 dB (0x1E00) RES 2.0 dB (0x0200) 2.0 dB (0x0200) 2.0 dB (0x0200)
MIXER UNIT DEFAULT SETTINGS
The power-on default control settings of the MU are: DAC channels: -20 dB AUX channels: 0 dB MIC channels: 0 dB
OUTPUT TERMINAL
The ADC Output Terminal (OT) is used to transmit audio information from the audio function. USB IN endpoints as well as analog outputs are supported by the ADC specification. The DS4201 uses OT:TID4 to connect the output cluster from the MU:UID8 to the analog line out.
ENDPOINT 0
Control of an audio function is performed over the default pipe through device requests and interface endpoint and control settings. The ADC specification supports the standard device requests as defined in the USB core specification. It also defines Audio Device class-specific requests to control device operation. APPENDIX A contains USB core and ADC requests supported by the DS4201.
NOTE:
USB Core or ADC commands not listed in APPENDIX A are not supported by the DS4201. DS4201 response to these unsupported commands will be a STALL on the Endpoint 0 control pipe in accordance with the USB Core and ADC specifications.
AUDIO STREAMING INTERFACE
The STREAMING interface is used to receive the digital PCM audio stream from the host and to control host-de-vice data synchronization. Additionally, the STREAMING interface will support six alternative settings: ALT-0: (default setting) zero isochronous bandwidth ALT-1: Asynch synchronization, 16-bit PCM stereo ALT-2: Asynch synchronization, 16-bit PCM mono ALT-3: Asynch synchronization, 8-bit PCM stereo ALT-4: Asynch synchronization, 8-bit PCM mono ALT-5: Adaptive synchronization, 16-bit PCM stereo The zero isoch bandwidth setting is included to provide the host system with a mechanism to manage USB bandwidth. This setting allows the host to reclaim isochronous bandwidth without deconfiguring the audio device. For alternate settings 1-4, two USB endpoints exist: Endpoint 1 for an isochronous data input (USB OUT from the host) with asynchronous synchronization, and Endpoint 2 for isochronous synchronization feed-back. For alternate setting 5, one USB endpoint exists: Endpoint 1 for an 8 of 24 102099
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isochronous data input with adaptive synchronization. Except for ALT-0, the DS4201 supports 44.1 KHz and 48.0 KHz audio data sampling rates at Endpoint 1. Sampling rate control is performed using ADC standard requests as described in APPENDIX A. PCM data formats are listed in APPENDIX B.
ENDPOINT 1
The USB isochronous data pipe at Endpoint 1, EP1, delivers PCM audio data to the DS4201. The data sampling frequency at EP1 can be set at either 44.1 KHz or 48.0 KHz. PCM data captured by the host at rates other than these two rates require sample rate conversion before being sent to the DS4201. Control of the sampling rate is performed with ADC endpoint commands as described in APPENDIX A. The USB isochronous audio data received at EP1 is delivered to Input Terminal 1 (IT:TID1) in the CONTROL interface. There is a one-to-one link between these two elements. The maximum packet size supported by EP1 varies with the PCM data type selected. The maximum packet sizes reported in the STREAMING interface descriptors corresponds to the PCM data format at a 48 KHz sampling rate plus an additional data sample for synchronization. The USB core specification requires a minimum 1 frame delay before a USB device can operate on isochronous data. The DS4201 produces a 1 frame delay and incorporates enough FIFO register storage space for 2 frames total (previous frame plus current frame).
ENDPOINT 2
For alternate settings 1-4, the DS4201 uses the asynchronous type of communication synchronization for the isochronous data pipe as defined in the USB core specification. The isochronous synchronization pipe from Endpoint 2 is used to provide the 3-byte data rate feedback value to the host.
USB TRANSCEIVER
Integrated within the DS4201 is a USB compliant bus transceiver. To comply with USB cable termination requirements, resistors external to the DS4201 must be installed as shown in Figure 4. The 24 ohm, 1% tolerance resistors are necessary to bring the total steady state resistance of each driver to the 28-43 ohms range required by the USB core specification. The 1.5K ohms pull-up resistor is required to identify the bus as high speed USB.
TRANSCEIVER TERMINATION Figure 4
VOLTAGE REFERENCE
The VREFI input is a connection to a filter node of the internal voltage reference and is used to apply additional filtering of the reference to reduce noise. This is accomplished by connecting both a 0.1 F and 10 F capacitor across this input and analog ground. No other connection should be made to this input and the potential for coupling onto this input should be minimized to avoid degrading analog performance. 9 of 24 102099
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The VCM output provides the DC bias point to which AC signals are referenced and processed internally. This output provides a common mode signal that can be used by external circuitry operating from a single supply. The nominal level of this output is 0.4xVA. VCM cannot support dynamic loading and should be buffered if AC loading is needed. For typical use, a 0.47 F capacitor should be connected across VCM and analog ground for filtering.
NOTE:
See APPENDIX C for additional application information regarding these reference signals.
ANALOG I/O
DS4201 analog I/O consists of two stereo inputs (AUX and MIC) and one stereo output (OUT). Full scale input and output signal levels supported depend on device operating voltage, the Mixer Unit (MU:UID8) control setting, and the control setting of the USB audio extension unit (XU:UID9) as listed in the Analog Performance Characteristics table.
ANALOG INPUTS
Analog signal levels at both the AUX and MIC inputs must be limited to the full scale range supported by the operating voltage: 0.5 Vrms for 3.3V operation, 1.0 Vrms for 5.0V operation. Additionally, the input signal must be either AC-coupled to the analog input or centered about the common mode reference level VCM. For optimal performance, analog input signals should be AC-coupled. External signal attenuation may be necessary to accommodate 1 Vrms and/or 2 Vrms line level swings that are typically output from audio equipment. See APPENDIX C for recommended connection diagrams and example interface circuits for additional information.
ANALOG OUTPUTS
Analog signal levels at the LOUT and ROUT outputs are DC biased about the common mode reference output VCM and should be AC-coupled to external circuitry. Depending on operating voltage, the DS4201 is designed to produce full-scale output levels of either 0.5 Vrms or 1.0 Vrms, see Analog Performance Characteristics. Again, see APPENDIX C for recommended connection diagrams and example interface circuits for additional information.
POWER POWER SUPPLY
The three power inputs to the DS4201 provide power to the USB digital (VB), non-USB digital (VD), and analog circuitry (VA) within the device. These power inputs, combined with a USB suspend power mode input signal (SPM), provide a range of power configurations. The options include: * Entire device powered from USB bus power. * USB circuitry powered from USB bus power, analog and digital circuitry powered from a separate single source. * USB circuitry powered from USB bus power, analog circuitry powered from an analog supply, digital circuitry powered from a digital supply. * Entire device powered from non-USB bus power with multiple variations possible.
NOTE:
USB core specification power requirements must be considered for any power configuration that consumes power from the USB bus. 10 of 24 102099
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POWER MANAGEMENT
The power management features of the DS4201 are used to control device and external circuit power consumption whenever a USB suspend state is entered; the suspend power mode (SPM) input and suspend output (SUSO\) signals are used for this control.
SUSPEND POWER MODE
The DS4201 supports two modes of operation when the USB enters a suspend state; the suspend power mode input signal (SPM) is used to select which of the two modes the device will enter upon suspend. When the suspend state is entered, the SPM input level is used to selectively shut down specific DS4201 circuitry. Power consumption during the USB suspended state for the two suspend power modes and various input voltage conditions are listed in the DC Characteristics Table and are summarized in the following table and paragraphs:
SUSPEND POWER STATES Table 4
BUS STATE Active Suspended Suspended SPM X 1 0 POWER CONSUMPTION Active Reduced from active Minimum
When SPM=1 and the USB enters a suspend state, the DS4201 DAC and oscillators are powered down and digital circuitry enters a low power static state. All other analog circuitry remains powered so that the signal paths for the AUX and MIC inputs are active. When SPM=0 and the USB enters a suspend state, power consumption is minimized. For this state\mode, all analog circuitry and oscillators are powered down and digital circuitry enters a low power static state.
NOTE:
For this state\mode the analog circuitry in the AUX and MIC paths are powered down and analog audio playback over the AUX and MIC channels will be turned off until the USB returns to an active state. Therefore it is recommended that the AUX and MIC inputs not be made available for analog input playback in an application where SPM=0.
Suspend Output
Whenever the USB enters a suspend state the DS4201 suspend output signal ( SUSO ) is driven low. This signal could be used stand-alone or combined with other external signals to power down circuitry external to the DS4201, such as amplifiers and power sources, to manage audio system power consumption during periods of inactivity. The SUSO signal is an open drain output and requires an external pull-up to a positive supply no greater than 6.0V.
OSCILLATORS
The DS4201 requires two clock sources to operate: 12.0 MHz and 12.288 MHz. Crystals or CMOS crystal oscillators may be used to provide the clock sources.
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For crystals, use parallel resonant, fundamental mode with a CL specification between 10 pF and 20 pF at the required frequency. Parallel loading capacitors with a value of approximately twice CL are also required. The connection scheme shown in APPENDIX C should be used. For external CMOS crystal oscillators, make a connection directly to the DS4201 X1I and/or X2I inputs. The X1O and X2O outputs must be left floating for this arrangement.
ELECTRICAL CHARACTERISTICS ABSOLUTE MAXIMUM RATINGS
Voltage on Any Pin Relative to Ground VD to VA Differential Operating Temperature Storage Temperature Soldering Temperature -0.5V to +6.0V 0.2V 0 to 70 C C -55 to +125 C C 260 for 10 seconds C
*This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operation sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability.
ANALOG PERFORMANCE CHARACTERISTICS
CONDITIONS: PARAMETER DAC RESOLUTION DAC SAMPLING FREQUENCY tA : 25C, VD: 3.0V-5.5V, VA: 3.0V-5.5V, VB: 3.0V-3.6V MIN TYP MAX UNITS NOTES 8 16 Bits 44.1 48 KHz DYNAMIC PERFORMANCE Signal-to-Noise Ration (SNR) 8-bit 40 dB 1 16-bit 80 dB 1 Total Harmonic Distortion + 8-bit -35 dB 1,2 Noise (THD+N) 16-bit -75 dB 1,2 Dynamic Range 8-bit 40 dB 1,2 16-bit 80 dB 1,2 Crosstalk between Input Channels -70 dB 1,2 DIGITAL FILTER PERFOMANCE Frequency Response -0.25 +0.25 dB 1,2 Passband 0 0.4xFs KHz 3,2 Transition Band 0.4xFs 0.6xFs KHz 3,2 Stop Band 0.6xFs KHz 3,2 Stop Band Attenuation -74 dB 2 DC ACCURACY Interchannel Gain/Attenuation Mismatch 0.5 dB 2 Gain/Attenuation Error 10 % 2 Gain/Attenuation Drift 100 ppm/C 2 Offset Error 10 mV 2,6 ANALOG INPUT Full Scale Input Voltage 3V operation 1.27 1.41 1.55 VPP 6 5V operation 2.55 2.83 3.11 VPP 6 Input Resistance 4.3 89.7 212.6 7 K 12 of 24 102099
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ANALOG OUTPUT Full Scale Output Voltage double control= FALSE double control= TRUE 1.27 1.41 1.55 VPP VPP K V A dB dB dB dB dB dB 5,6 5,6 8 5,6 4
2.55 2.83 3.11 External Load Impedance 10 Common Mode Reference Output (VCM) 0.36xVA 0.4xVA 0.44xVA VCM current drain (CM) 50 MIXER PROGRAMMABILITY DAC Inputs -96.0 0 Programmable Mix MIC Inputs -32.0 30.0 Levels AUX Inputs -32.0 30.0 DAC Inputs 2.0 Programmable Mix MIC Inputs 2.0 Level Step Size AUX Inputs 2.0
NOTES:
1. 2. 3. 4. 5. See APPENDIX D for parameter definition and measurement technique. Values are guaranteed by characterization and sample testing but are not 100% production tested. Frequency value obtained by multiplying by the DAC sampling rate. DC current only. If dynamic loading exists, the voltage reference output must be buffered to prevent DAC performance degradation. The USB audio extension unit control selector OUTPUT_DOUBLE is used to control the full scale DAC channel output level as specified. For 3V operation, the property must be set to FALSE. DAC signal range saturation will occur if operating at 3V with a property setting of TRUE. For 5V operation the property can be set to TRUE or FALSE. This property has no effect on the full-scale output level of the AUX and MIC analog signal channels before the output mixer. Voltages referenced to ground. Input impedance is a function of the mixer attenuation setting for the analog input channel. The min value is at the +30 dB setting, the nominal value is at the 0 dB setting, and the max value is at the -32 dB setting. The minimum load impedance the LOUT and ROUT output amplifiers are designed to drive.
6. 7.
8.
RECOMMENDED DC OPERATING CONDITIONS
PARAMETER SYMBOL Analog Supply Voltage, VA 3V Operation Analog Supply Voltage, VA 5V Operation Digital Supply Voltage, VD 3V Operation Digital Supply Voltage, VD 5V Operation USB I/F Supply Voltage VB Input Logic 0 VIL Input Logic 1 VIH Operating Temperature TA MIN 3.0 4.5 3.0 4.5 3.0 -0.3 2.8 0 TYP 3.3 5.0 3.3 5.0 3.3 MAX 3.6 5.5 3.6 5.5 3.6 0.3 VD+0.3 70 UNITS V V V V V V V C NOTES 1,2 1,2 1,2 1,2 2 2 2
25
NOTES:
1. Maximum allowable VA to VD differential is 0.2 V. 13 of 24 102099
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2. Voltage referenced to ground.
DC CHARACTERISTICS
CONDITIONS: PARAMETER Output Logic 1 Voltage (IOUT = -1.0mA) Output Logic 0 Voltage (IOUT = 3.0mA) Input Leakage Current Output Leakage Current I/O Leakage Current SYMBOL VOH VOL IIL IOL IIOL -1 -1 -1 tA: 25C, VD: 3.0V-5.5V, VA: 3.0V-5.5V, VB: 3.0V-3.6V MIN TYP MAX UNITS NOTES 2.8 V 1,2 0.3 +1 +1 +1 V A A A mA mA mA mA mA 2
Analog Supply Current, 3V Operation Analog Supply Current, 5V Operation Digital Supply Current, 3V Operation Digital Supply Current, 5V Operation USB I/F Supply Current
USB STATE: UNCONFIGURED IA 30 45 IA ID ID IB 35 10 15 10 55 15 25 15
Analog Supply Current, 3V Operation Analog Supply Current, 5V Operation Digital Supply Current, 3V Operation Digital Supply Current, 5V Operation USB I/F Supply Current
USB STATE: CONFIGURED IA 30 IA ID ID IB 35 30 50 10
45 55 45 75 15
mA mA mA mA mA
Analog Supply Current, 3V Operation Analog Supply Current, 5V Operation Digital Supply Current, 3V Operation Digital Supply Current, 5V Operation USB I/F Supply Current
USB STATE: SUSPENDED, SPM=1 IA 30 45 IA ID ID IB 35 75 100 50 55 115 150 75
mA mA A A A A 102099
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USB STATE: SUSPENDED, SPM=0 IA 1 2 14 of 24
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3V Operation Analog Supply Current, 5V Operation Digital Supply Current, 3V Operation Digital Supply Current, 5V Operation USB I/F Supply Current
IA ID ID IB
1 75 100 50
2 115 150 75
A A A A
NOTES:
1. Max VOH for D+ and D- is VB. Max VOH for all other digital outputs is VD or the pull-up voltage level. 2. Voltage referenced to ground.
AC CHARACTERISTICS
CONDITIONS: PARAMETER Crystal 1 (X1) Frequency Crystal 2 (X2) Frequency SYMBOL FOSC1 FOSC2 tA: 25C, VD: 3.0V-5.5V, VA: 3.0V-5.5V, VB: 3.0V-3.6V MIN TYP MAX UNITS NOTES 12.0 MHz 12.288 MHz
CAPACITANCE
CONDITIONS: PARAMETER Input Capacitance Output Capacitance Input/Output Capacitance
tA: 25C
SYMBOL CIN COUT CIO
MIN
TYP
MAX 10 15 15
UNITS pF pF pF
NOTES
SIGMA-DELTA DAC AND DSP CHARACTERISTICS
Figure 5-7 show the overal, pass band, and transition band sampling frequency response of the SD4201 sigma-delta DAC converter at Fs=44.1 KHz.
OVERALL FREQUENCY RESPONSE FIGURE 5
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PASS-BAND RESPONSE FIGURE 6
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TRANSITION BAND RESPONSE FIGURE 7
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APPENDIX A: DS4201 USB COMMANDS AND REQUESTS
USB commands and command forms not listed here are not supported by the DS4201. The DS4201 will respond to unsupported commands with a STALL handshake on the Control endpoint as defined in the USB core and ADC specifications.
USB CORE SPECIFICATION REQUESTS
DS4201 SUPPORTED USB CORE DEVICE REQUESTS STANDARD DEVICE REQUESTS TARGET ELEMENT RANGE NOTES SET_ADDRESS Device 0x01 - 0xFF SET_CONFIGURATION Device 0x00 - 0x01 1 GET_CONFIGURATION Device 0x00 - 0x01 GET_DESCRIPTOR Device 2 GET_INTERFACE STREAMING Interface INFC0:0x00 3,4 INFC1:0x00 - 0x05 SET_INTERFACE STREAMING Interface INFC0:0x00 3,4 INFC1:0x00 - 0x05 GET_STATUS Device, Interfaces, Endpoints 0-2 5,6,7
NOTES:
1. The only valid configuration values are 0 and 1 for the SET_CONFIGURATION request. Configuration value 0 corresponds to the non-configured state. 2. Only the DEVICE and CONFIGURATION descriptor types are supported for the GET_DESCRIPTOR request. 3. There are no alternate settings for the Control Interface (INFC0). 4. Interface settings for the Streaming Interface are defined in the Audio Streaming Interface section. 5. The DS4201 is intended, at a minimum, to be partially bus powered. GET_STATUS requests to the device will return a logic 0 for the self-powered bit field. 6. The DS4201 does not set the Halt field for the default or isochronous endpoints nor does it accept the SET_FEATURE ENDPOINT_HALT command for the default or isochronous endpoints. Therefore the Halt field for GET_STATUS requests to endpoints will always return a value of zero. 7. There is no USB core level status information defined for interfaces. The DS4201 will always return zero value data for GET_STATUS requests to interfaces.
USB ADC CLASS REQUESTS
TARGET ELEMENT Endpoint 1 GET_CUR DS4201 SUPPORTED USB ADC AUDIO STREAMING REQUESTS REQUESTS CONTROL VALID SETTINGS DESCRIPTION SET_CUR SAMPLING_FREQ_ CONTROL 0x00AC44 (44.1 KHz) 0x00BB80 (48.0 KHz) Set sampling freq for audio data Get sampling freq for audio data
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DS 4201 SUPPORTED ADC AUDIO CONTROL REQUESTS TARGET ELEMENT REQUESTS SET_CUR COMMAND FORMS ICN, OCN=valid channels INC=0xFF OCN=0xFF ICN, OCN=valid address ICN=0xFF, OCN=0xFF ICN=0x00, OCN=0x00 ICN, OCN=valid address Mixer Unit GET_MAX INN=xFF, OCN=0xFF ICN, OCN=valid address GET_MIN INC=0xFF, OCN=0xFF ICN, OCN=valid address GET_RES INC=0xFF, OCN=0xFF CS=MUTE_CONTROL CN=valid channel CS=MUTE_CONTROL CN=FF CS=MUTE_CONTROL CN=FF CS=MUTE_CONTROL CN=FF CS=OUTPUT_DOUBLE_CONTROL CS=OUTPUT_DOUBLE_CONTROL DESCRIPTION Set addressed control Set all progammable controls Return addressed control setting Return setting of all progammable controls Return setting of all controls Return max setting of addressed control Return max setting of all progammable controls Return min setting of addressed control Return min setting of all progammable controls Return resolution setting of addressed control Return resolution setting of all progammable controls Set mute control for addressed channel Set mute for all channels Return mute control setting for addressed channel Return mute control setting for all channels Set value of Output Double contol Return setting of Output Double contol
GET_CUR
SET_CUR Feature Units GET_CUR SET_CUR Extension Unit GET_CUR
EXTENSION UNIT CONTROL PARAMETER BLOCK
CONTROL SELECTOR wLength OFFSET OUTPUT_DOUBLE_CONTROL 1 DESCRIPTION The DAC full-scale (FS) output level setting. This control is used to select either 0.5 VRMS or 1.0 VRMS FS output level from the DAC. when TRUE, DAC FS output=1VRMS when FALSE, DAC FS output=0.5VRMS
FIELD
SIZE
VALUE
0
bOn
1
Bool
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EXTENSION UNIT CONTROL SELECTOR
CONTROL SELECTOR OUTPUT_DOUBLE_CONTROL VALUE 0x00
APPENDIX B: PCM DATA FORMATS
The DS4201 supports four linear PCM data formats: 16-bit signed stereo, 16-bit signed mono, 8-bit unsigned stereo, and 8-bit unsigned mono. Data for-mats for these four PCM types are shown in Figure 8-11. Coding for PCM 8 and 16 bit formats are shown in Figure 12. As shown in Figure 12, the 16-bit signed format, also know as 2' complement, uses the value -32768 (0x8000) to represent maximum s negative amplitude and 32767 (0x7FFF) to represent maximum positive. The 8-bit unsigned format uses the value 0 (0x00) to represent maximum negative and 255 (0xFF) for maximum positive.
SIGNED 16-BIT STEREO DATA FORMAT Figure 8
... ... ... SAMPLE 3 RIGHT LEFT DATA DATA 31 16 15 SAMPLE 2 RIGHT LEFT DATA DATA 0 31 16 15 ? Time SAMPLE 1 RIGHT LEFT DATA DATA 0 31 16 15 0 (BIT POSN)
SIGNED 16-BIT MONO DATA FORMAT Figure 9
... ... ... ? Time SAMPLE 3 SAMPLE 2 SAMPLE 1 MONO DATA MONO DATA MONO DATA 15 0 15 0 15 0
(BIT POSN)
UNSIGNED 8-BIT STEREO DATA FORMAT Figure 10
... ... ... SAMPLE 3 RIGHT LEFT DATA DATA 15 87 SAMPLE 2 RIGHT LEFT DATA DATA 0 15 8 7 ? Time SAMPLE 1 RIGHT LEFT DATA DATA 0 15 8 7 0 (BIT POSN)
UNSIGNED 8-BIT MONO DATA FORMAT Figure 11
... ... ... SAMPLE 3 MONO DATA 7 07 SAMPLE 2 MONO DATA ? Time SAMPLE 1 MONO DATA 07 0
(BIT POSN)
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LINEAR PCM SAMPLE CODING FIGURE 12
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APPENDIX C: RECOMMENDED CONNECTION DIAGRAMS
The schematics in Figures C-1 and C-2 show possible DS4201 connections for the two suspend power mode (SPM) options. In both figures, resistor values are in ohms and capacitor values are in microfarads unless noted. In Figure C-1, SPM=1 and the DS4201 non-USB power inputs operate from +5V. AUX and MIC analog inputs are attenuated and ac coupled. The analog attenuation is necessary if input levels can exceed the Vrms max input level with +5V analog operation.
SPM=1 CONFIGURATION FIGURE C-1
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In Figure C-2, SPM=0 and all DS4201 power is supplied from 3.3V regulated USB VBUS power. Since DS4201 non-USB functions are powered down when SPM=0 and a USB suspend state is entered, AUX and MIC analog inputs are not used.
SPM=0 CONFIGURATION Figure C-2
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APPENDIX D: PARAMETER DEFINITIONS
SIGNAL-TO-NOISE RATIO: The ratio of the rms output level with a 1 KHz F.S. input to the rms output level with a zero level input. Measured A-weighted over 20 - 20 KHz with 0V applied to the MIC and AUX inputs. All mixer control settings at 0 dB. TOTAL HARMONIC DISTORTION + NOISE: The in-band harmonic distortion and noise response to a 1 KHz F.S. input. Measured by attenuating the 1 KHz F.S. fundamental with a narrow-band notch filter, then measuring the rms value of remaining harmonic and noise components over the 20 - 20 KHz bandwidth. All mixer control settings at 0 Db . DYNAMIC RANGE: The difference between the highest amplitude signal which the device can linearly handle and the device active noise level. Measured by adding 60 dB to the device rms response to a 1KHz input signal 60 dB below F.S. Measured A-Weighted over 20-20 KHz bandwidth by attenuating the fundamental frequency with a narrow- band notch filter then measuring the remaining in-band signal level. All mixer control settings at 0 dB. FREQUENCY RESPONSE: The amplitude response variation relative the amplitude response at 1 kHz. Measured over a bandwidth of 20 Hz to 0.4x Fs, where Fs is the DAC sampling frequency. All mixer control settings at 0 dB. CROSSTALK BETWEEN INPUT CHANNELS: Measured for each channel at the output with a zero level applied to the input under test and a 1 KHz F.S. signal applied to all the other input channels. Measured over a 20 - 20 KHz bandwidth. All mixer control settings at 0 dB. INTERCHANNEL GAIN MISMATCH: The gain difference between left and right channels. Measured from the difference between the two 20 - 20 KHz band-limited rms outputs with a 1 KHz F.S. signal at both inputs. All mixer control settings at 0 dB. GAIN ERROR: For each channel, the difference between the expected output and actual output for a 1 KHz input. Measured over the complete mixer control range and a 20 - 20 KHz bandwidth. GAIN DRIFT: The change in gain value with temperature. OFFSET ERROR: The difference between the output and the internal reference with zero level inputs. All mixer control settings at 0 dB.
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