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1 of 24 102099 features fully usb core class v1.0 compliant fully usb audio device class v1.0 compliant complete stereo dac system 16?bit sd 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 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. nc nc nc suso vcm vrefi va agnd lout rout lmic rmic laux raux 1 2 3 4 5 6 7 8 9 10 11 12 13 14 vd nc nc dgnd spm x2i x2o dgnd x1i x1o vb d- d+ dgnd 28 27 26 25 24 23 22 21 20 19 18 17 16 15 28-pin dip 600 mil DS4201 usb audio dac www.dalsemi.com ale wr rlink rlclk dvss rclk rchclk rser rsync rlos/lotc sysclk nc nc vcm nc vregi va nc agnd lout nc rout nc dgnd nc nc vd nc nc nc nc suso nc vb d- nc d+ dgnd nc nc raux laux rmic lmic 34 33 23 22 12 1 11 44 44-pin qfp (10mm x 10mm) ordering information part number description DS4201 28-pin dip DS4201f 44-pin qfp
DS4201 2 of 24 102099 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 type function d+ i/o usb data ? non-inverted signal of differential data pair. d- i/o usb data ? inverted signal of differential data pair. spm i suspend power mode ? controls device power configuration when a usb suspend state is entered. suso o 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. rmic i microphone right channel analog input to the analog output mixer. lmic i microphone left channel analog input to the analog output mixer.
DS4201 3 of 24 102099 signal name type function raux i auxiliary right channel analog input to the analog output mixer. laux i auxiliary left channel analog input to the analog output mixer. rout o right channel analog audio output from the mixer, 0.5 v rms or 1.0 v rms centered about v ref. lout o left channel analog audio output from the mixer, 0.5 v rms or 1.0 v rms centered about v ref. vcm o dc bias point to which all ac coupled inputs are centered. nominally v ref = 0.4 x va. vrefi i filter capacitor connection for internal voltage reference node. connect a 10f and 0.1f capacitor to v refi , very close to the pin, for best operation. va i power supply input for analog functions. range: 3.0 ? 5.5v. vd i power supply input for digital functions. range: 3.0 ? 5.5v. vb i usb i/f power supply input. range: 3.0 ? 3.6v. dgnd i digital ground. agnd i analog ground. x1i i crystal 1 input. use a 12.0 mhz, fundamental mode, parallel resonant crystal. a 12.0 mhz cmos clock source may also be used. x10 o crystal 1 output. connect to other side of crystal 1 if used. x2i i crystal 2 input. use a 12.888 mhz, fundamental mode, parallel resonant crystal. a 12.288 mhz cmos clock source may also be used. x2o o crystal 2 output. connect to other side of crystal 2 if used. nc no connect. leave these pins unconnected. 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.
DS4201 4 of 24 102099 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 para- graphs. operational block diagram figure 2
DS4201 5 of 24 102099 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.
DS4201 6 of 24 102099 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 v pp or 2.828 v pp the xu control parameter, output_ double_control, is used to select or enable the output range mode. when set true, the 2.828 v pp range is selected; when false, the 1.414 v pp range is selected. when the DS4201 is operating from a 3v power source, the 1.414 v pp 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 v pp ) 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 signal supported properties fu:uid5 channel 0 master mute fu:uid5 channel 1 left dac mute fu:uid5 channel 2 right dac mute fu:uid6 channel 0 master mute fu:uid6 channel 1 left aux mute fu:uid6 channel 2 right aux mute fu:uid7 channel 0 master mute fu:uid7 channel 1 left mic mute fu:uid7 channel 2 right mic mute feature units default settings the power?on default settings of the three fu?s are: fu :uid5 ? channels 0?2, mute = false fu :uid6 ? channels 0?2, mute = false fu :uid7 ? channels 0?2, mute = false
DS4201 7 of 24 102099 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 input channel 1 (out-l) 2 (out-r) 1 (dac-l) 1 0 2 (dac-r) 0 1 3 (aux-l) 1 0 4 (aux-r) 0 1 5 (mic-l) 1 0 6 (mic-r) 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.
DS4201 8 of 24 102099 mu :uid8 control range table 3 mixer control range input cluster min max res dac -96.0 db (0xa000) 0.0 db (0x0000) 2.0 db (0x0200) aux -32 db (0xe000) 30.0 db (0x1e00) 2.0 db (0x0200) mic -32 db (0xe000) 30.0 db (0x1e00) 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 end- point 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
DS4201 9 of 24 102099 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 o r 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 supp orted 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 m f and 10 m 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.
DS4201 10 of 24 102099 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 m 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.
DS4201 11 of 24 102099 power management the power management features of the DS4201 are used to control device and external circuit power con- sumption 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 spm power consumption active x active suspended 1 reduced from active suspended 0 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.
DS4201 12 of 24 102099 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 ?0.5v to +6.0v v d to v a differential 0.2v operating temperature 0 c to 70 c storage temperature ?55 c to +125 c soldering temperature 260 c for 10 seconds *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: t a : 25c, vd: 3.0v?5.5v, va: 3.0v?5.5v, vb: 3.0v?3.6v parameter min typ max units notes dac resolution 8 16 bits dac sampling frequency 44.1 48 khz dynamic performance 8-bit 40 db 1 signal-to-noise ration (snr) 16-bit 80 db 1 8-bit -35 db 1,2 total harmonic distortion + noise (thd+n) 16-bit -75 db 1,2 8-bit 40 db 1,2 dynamic range 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 3v operation 1.27 1.41 1.55 v pp 6 full scale input voltage 5v operation 2.55 2.83 3.11 v pp 6 input resistance 4.3 89.7 212.6 k w 7
DS4201 13 of 24 102099 analog output double control= false 1.27 1.41 1.55 v pp 5,6 full scale output voltage double control= true 2.55 2.83 3.11 v pp 5,6 external load impedance 10 k w 8 common mode reference output (vcm) 0.36xva 0.4xva 0.44xva v 5,6 vcm current drain (cm) 50 m a 4 mixer programmability dac inputs -96.0 0 db mic inputs -32.0 30.0 db programmable mix levels aux inputs -32.0 30.0 db dac inputs 2.0 db mic inputs 2.0 db programmable mix level step size aux inputs 2.0 db notes: 1. see appendix d for para meter definition and measurement technique. 2. values are guaranteed by characterization and sample testing but are not 100% production tested. 3. frequency value obtained by multiplying by the dac sampling rate. 4. dc current only. if dynamic loading exis ts, the voltage reference output must be buffered to prevent dac performance degradation. 5. 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. 6. voltages referenced to ground. 7. 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. 8. the minimum load impedance the lout and rout output amplifiers are designed to drive. recommended dc operating conditions parameter symbol min typ max units notes analog supply voltage, 3v operation va 3.0 3.3 3.6 v 1,2 analog supply voltage, 5v operation va 4.5 5.0 5.5 v 1,2 digital supply voltage, 3v operation vd 3.0 3.3 3.6 v 1,2 digital supply voltage, 5v operation vd 4.5 5.0 5.5 v 1,2 usb i/f supply voltage vb 3.0 3.3 3.6 v 2 input logic 0 vil -0.3 0.3 v 2 input logic 1 vih 2.8 vd+0.3 v 2 operating temperature ta 0 25 70 c notes: 1. maximum allowable va to vd differential is 0.2 v.
DS4201 14 of 24 102099 2. voltage referenced to ground. dc characteristics conditions: t a : 25c, vd: 3.0v?5.5v, va: 3.0v?5.5v, vb: 3.0v?3.6v parameter symbol min typ max units notes output logic 1 voltage (iout = -1.0ma) voh 2.8 v 1,2 output logic 0 voltage (iout = 3.0ma) vol 0.3 v 2 input leakage current iil -1 +1 m a output leakage current iol -1 +1 m a i/o leakage current iiol -1 +1 m a usb state: unconfigured analog supply current, 3v operation ia 30 45 ma analog supply current, 5v operation ia 35 55 ma digital supply current, 3v operation id 10 15 ma digital supply current, 5v operation id 15 25 ma usb i/f supply current ib 10 15 ma usb state: configured analog supply current, 3v operation ia 30 45 ma analog supply current, 5v operation ia 35 55 ma digital supply current, 3v operation id 30 45 ma digital supply current, 5v operation id 50 75 ma usb i/f supply current ib 10 15 ma usb state: suspended, spm=1 analog supply current, 3v operation ia 30 45 ma analog supply current, 5v operation ia 35 55 ma digital supply current, 3v operation id 75 115 m a digital supply current, 5v operation id 100 150 m a usb i/f supply current ib 50 75 m a usb state: suspended, spm=0 analog supply current, ia 1 2 m a
DS4201 15 of 24 102099 3v operation analog supply current, 5v operation ia 1 2 m a digital supply current, 3v operation id 75 115 m a digital supply current, 5v operation id 100 150 m a usb i/f supply current ib 50 75 m 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: t a : 25c, vd: 3.0v?5.5v, va: 3.0v?5.5v, vb: 3.0v?3.6v parameter symbol min typ max units notes crystal 1 (x1) frequency f osc1 12.0 mhz crystal 2 (x2) frequency f osc2 12.288 mhz capacitance conditions: t a : 25c parameter symbol min typ max units notes input capacitance cin 10 pf output capacitance cout 15 pf input/output capacitance cio 15 pf 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
DS4201 16 of 24 102099 pass-band response figure 6
DS4201 17 of 24 102099 transition band response figure 7
DS4201 18 of 24 102099 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 infc1:0x00 ? 0x05 3,4 set_interface streaming interface infc0:0x00 infc1:0x00 ? 0x05 3,4 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 DS4201 supported usb adc audio streaming requests target element requests control valid settings description set_cur set sampling freq for audio data endpoint 1 get_cur sampling_freq_ control 0x00ac44 (44.1 khz) 0x00bb80 (48.0 khz) get sampling freq for audio data
DS4201 19 of 24 102099 ds 4201 supported adc audio control requests target element requests command forms description icn, ocn=valid channels set addressed control set_cur inc=0xff ocn=0xff set all progammable controls icn, ocn=valid address return addressed control setting icn=0xff, ocn=0xff return setting of all progammable controls get_cur icn=0x00, ocn=0x00 return setting of all controls icn, ocn=valid address return max setting of addressed control get_max inn=xff, ocn=0xff return max setting of all progammable controls icn, ocn=valid address return min setting of addressed control get_min inc=0xff, ocn=0xff return min setting of all progammable controls icn, ocn=valid address return resolution setting of addressed control mixer unit get_res inc=0xff, ocn=0xff return resolution setting of all progammable controls cs=mute_control cn=valid channel set mute control for addressed channel set_cur cs=mute_control cn=ff set mute for all channels cs=mute_control cn=ff return mute control setting for addressed channel feature units get_cur cs=mute_control cn=ff return mute control setting for all channels set_cur cs=output_double_control set value of output double contol extension unit get_cur cs=output_double_control return setting of output double contol extension unit control parameter block control selector output_double_control wlength 1 offset field size value description 0 bon 1 bool 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
DS4201 20 of 24 102099 extension unit control selector control selector value output_double_control 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?s complement, uses the value -32768 (0x8000) to represent maximum 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 ?time . . . sample 3 sample 2 sample 1 . . . right data left data right data left data right data left data . . . 31 16 15 0 31 16 15 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 ?time . . . sample 3 sample 2 sample 1 . . . right data left data right data left data right data left data . . . 15 8 7 0 15 8 7 0 15 8 7 0 (bit posn) unsigned 8?bit mono data format figure 11 ?time . . . sample 3 sample 2 sample 1 . . . mono data mono data mono data . . . 7 0 7 0 7 0 (bit posn)
DS4201 21 of 24 102099 linear pcm sample coding figure 12
DS4201 22 of 24 102099 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
DS4201 23 of 24 102099 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
DS4201 24 of 24 102099 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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