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uac 3552a universal serial bus dac edition nov. 9, 1999 6251-487-1pd preliminary data sheet micr onas micronas
uac 3552a preliminary data sheet 2 micronas contents page section title 4 1. introduction 5 1.1. features 6 2. functional description 6 2.1. hardware 6 2.1.1. usb interface 6 2.1.1.1. transceiver 6 2.1.1.2. interface engine 6 2.1.1.3. microcontroller 6 2.1.2. audio control interface 6 2.1.3. audio streaming interface 6 2.1.4. audio processing unit 6 2.1.5. analog back-end 7 2.1.5.1. dac 8 2.1.5.2. analog low-pass 8 2.1.5.3. postfilter op amps 8 2.1.5.4. input mixer 9 2.1.5.5. analog volume control 9 2.1.5.6. line-out/headphone amplifier 9 2.1.6. general purpose i/o 10 2.1.7. special i/o 10 2.1.7.1. sof (start of frame) 10 2.1.7.2. auxen 10 2.1.7.3. suspend 10 2.1.8. clock system 10 2.2. software 10 2.2.1. usb microcontroller software 10 2.2.1.1. chapter 9 functions 10 2.2.1.2. device descriptor 10 2.2.1.3. string descriptor 11 2.2.1.4. hid report descriptor 11 2.2.2. audio processing software 11 2.2.2.1. sample rate converter 11 2.2.2.2. automatic gain control 12 2.2.2.3. bass control 12 2.2.2.4. treble control 13 2.2.2.5. bass boost control 13 2.2.2.6. parametric equalizer 13 2.2.2.7. volume and balance control 13 2.2.3. mute control 13 2.2.3.1. oversampling
contents, continued page section title preliminary data sheet uac 3552a micronas 3 14 3. specifications 14 3.1. outline dimensions 14 3.2. pin connections and short descriptions 16 3.3. pin descriptions 16 3.3.1. power supply pins 16 3.3.2. analog audio pins 17 3.3.3. other pins 17 3.4. pin configuration 18 3.5. pin circuits 19 3.6. electrical characteristics 19 3.6.1. absolute maximum ratings 20 3.6.2. recommended operating conditions 22 3.6.3. characteristics 26 4. applications 26 4.1. recommended low-pass filters for analog outputs 27 4.2. typical application 28 5. data sheet history
uac 3552a preliminary data sheet 4 micronas universal serial bus dac 1. introduction the uac 3552a is the first member of micronas? usb audio controller family of ics targeting a wide variety of audio applications on the usb. the uac 3552a is a single-chip, high-precision digital-to-analog audio con- verter. it includes a high-quality audio sample rate con- verter and is able to support a wide range of sample rates, as well as different audio formats. the ic contains a complete usb transceiver that allows direct connection to the usb. an on-chip eeprom allows storing of manufacturer-specific data or product identification. the eeprom can be pro- grammed directly via the usb. baseband audio processing is handled by an internal, powerful dsp. apart from basic audio features, like tone and volume control, there is enough processing power left to realize customer-specific applications. the audio dac uses micronas? proprietary multibit sigma-delta technique. it features very low sensitivity to clock jitter, high linearity, and a superior s/n ratio. the uac 3552a provides an on-chip headphone/ speaker amplifier. moreover, mixing additional analog audio sources to the d/a-converted signal is sup- ported. the ic is designed for all kinds of usb audio applica- tions, such as usb active speakers, usb headphones, and usb interfaces to home stereo equipment, etc. any existing analog speaker set can easily be upgraded to usb by just including the uac 3552a according to the application circuit on page 27. no software development is required, because all drivers are already part of the operating system which sup- ports usb (e. g. windows? 98). fig. 1?1: block diagram of the uac 3552a d+ d ? outl outr dac input select usb and mixing interface dsp analog input volume and headphone amplifier +5 v gnd hid io external loop-through filter rom rom eeprom
preliminary data sheet uac 3552a micronas 5 1.1. features ? single-chip, usb specification 1.0/1.1 compliant, stereo audio d/a converter ? 12-mbit/s usb transceiver ? adaptive isochronous endpoint for usb audio ? usb-programmable vendor ids (1024-bit eeprom on chip) ? four general purpose input pins and four output pins (human interface pins) ? customizable i/o functionality by download-software ? supports 16-bit mono/stereo and 24-bit stereo audio data ? adaptive sample rate converter for 5 to 50 khz input sampling rate ? audio baseband control: bass, treble, volume, and balance, additional analog volume, mute ? bass boost ? automatic gain control (agc) ?? perfectspeaker ? digital speaker equalizer ? thd better than 0.01 %, snr of 96 db ? integrated low-power stereo headphone amplifier ? on-chip op amps for external analog filter ? analog stereo input (aux) with source selection and mixing ? single 5-v power supply fig. 1 ? 2: system application diagram uac active stereo speakers headphones stereo equipment usb
uac 3552a preliminary data sheet 6 micronas 2. functional description 2.1. hardware a detailed block diagram of the uac 3552a is depicted in fig. 2 ? 1. the functions of the blocks are explained in the following sections. 2.1.1. usb interface 2.1.1.1. transceiver the differential input receiver is used to accept the usb data signal according to the full-speed (12 mb/s) usb driver characteristics (usb spec 1.1 - 7.1.4). 2.1.1.2. interface engine the interface engine comprises two major sections: the transceiver logic and the receiver logic. the trans- ceiver logic transmits data packets built in memory by the microcontroller. these packets are converted from a serial to a parallel data stream. this includes nrzi encoding, bit stuffing, crc-computation, and addition of sync field and eop. the receiver logic will receive usb data and stores these packets in its memory for processing by the microcontroller. serial usb data is converted to a byte-wide parallel data stream and stored in system memory. in addition to usb basic data decoding, the rx logic performs a pid check and protocol layer checks. 2.1.1.3. microcontroller the microcontroller manages buffers for all enabled endpoints and interacts with the interface engine. the buffers are built and decoded in memory. this way, the microcontroller realizes the usb protocol handling, like usb reset, enumeration, and all chapter 9 processing, error handling, as well as class-specific endpoint han- dling, like audio class and hid class. the audio-class processing consists of interpreting the usb audio commands and accordingly controlling the dsp-audio function through a dedicated audio-control-interface to the dsp. hid class processing means polling keys pro- viding the corresponding key-codes to the host-com- puter ? s requests. these keys are connected to the gpio-pins. the ram can be accessed by the micro- controller and by the interface-engine ? s dma-control- ler. all endpoint communication is realized with intelli- gent buffer management built up in the ram. a part of the ram is reserved for download software. this allows adding extra functionality to the gpio pins, like i 2 c-handling or any other control of external com- ponents via usb. downloading is handled by an extra driver which allows direct ram/rom access via usb. the rom contains the usb drivers for the microcon- troller as well as the complete descriptor table includ- ing the report descriptor for the hid-class. some parts of the descriptor which are subjected to be changed by the customer, however, reside in the eeprom. the eeprom is built to keep static customer-related data that will customize the uac 3552a-based usb device during production. the 128 8 bit eeprom contains the customer spe- cific information of the usb device descriptor, like ven- dor id, product id, as well as strings for manufacturer, product and serial number. apart from this usb- related information, the eeprom holds customer-spe- cific parameters for the perfectspeaker equalizer. the uac 3552a is shipped with a preprogrammed eeprom that allows normal usb functionality even if no reprogramming is performed on the customer ? s side. the eeprom can be programmed via usb by means of uac 3552a application tools. 2.1.2. audio control interface the audio control interface links the microcontroller to the dsp and is used to initialize the dsp and to trans- mit audio-related usb control data, like volume setting, tone control etc. 2.1.3. audio streaming interface the audio streaming interface directly connects the serial interface engine to the dsp in order to transmit the digital audio data. the interface collects and buff- ers the burst audio data for further processing by the audio processing unit. 2.1.4. audio processing unit the audio processing unit is a powerful dsp core which allows high-quality sample conversion, base- band audio processing, and interpolation filtering used for oversampling dac, as well as customized algo- rithms. for more details on the software see section 2.2.2. ? audio processing software ? on page 11. 2.1.5. analog back-end the analog back-end comprises the audio dac, ana- log filters, input mixer, op amps for optimal external postfiltering, analog volume and mute, and the output amplifier.
preliminary data sheet uac 3552a micronas 7 2.1.5.1. dac the dac uses oversampling technique with 3rd-order multibit noise-shaping. this technique results in extremely low quantization noise in the audio band. fig. 2 ? 1: detailed block diagram of the uac 3552a gp i/o control i/o 36 analog input transceiver interface engine ram rom eeprom audio streaming interface audio control interface c audio processing unit dac volume headphone amplifier digital supply analog 27 28 6 7 3 2 44 1 supply oscillator input mixer gpio0 gpio1 gpio2 gpio3 gpio4 gpio5 gpio6 gpio7 test resq suspend sof auxen 37 8 9 dminus dplus outl outr analog supply 45 2 29 30 31 32 33 14 15 16 17 19 20 21 22 24 25 vdd vss avdd0 avdd1 avss0 vref agndc avss1 26 vreg auxl auxr xti xto
uac 3552a preliminary data sheet 8 micronas 2.1.5.2. analog low-pass the output of the dac is filterted by an analog low- pass filter with a cut-off frequency of approximately 1.4 mhz. this filter removes the high-frequency com- ponents of the noise-shaping signal. 2.1.5.3. postfilter op amps this block contains the active components for the optional analog postfilters. it is recommended to use a second-order filter (see section 4. ? applications ? on page 26) in order to attenuate the out-of-band noise caused by the noise shaper the op amps and all i/o- pins for this block are shown in fig. 2 ? 2. 2.1.5.4. input mixer this block is used to mix the auxiliary inputs and the signals coming from the dac. this allows to use an uac 3552a-based usb speaker in a non-usb envi- ronment, like win 3.11 or other operating systems. on the other hand, it allows to connect additional analog sources, like cd-player or walkman even while the speaker is connected to the usb. the input mixer is hardware-controlled by the auxen pin. this allows to use a jack that switches the auxen to low when an analog source is plugged in, according to the application note section 4. ? applications ? on page 26. the dac-signal is permanently connected to the mixer because the dac is extremely quiet if no usb audio is applied. the auxen pin also keeps the uac 3552a from entering the low-power mode when an analog source is connected. please note that in this mode, the uac 3552a is not usb-compliant. if the usb is not connected the gpio pins work as an usb-indepen- dent volume control (see table 2 ? 2). bassboost is not supported in this mode. fig. 2 ? 2: postfilter op amps and analog volume table 2 ? 1: auxen pin auxen 0 aux not selected 1aux selected fopl finl fopr outr foutl foutr finr agndc vref analog vol. l analog vol. r ? ? ? outl ? from switch matrix uac 3552a (back-end) avss for external components , see section ? applications ? for external components , see section ? applications ?
preliminary data sheet uac 3552a micronas 9 2.1.5.5. analog volume control the analog volume control covers a range from 0 db to ? 75 db plus an additional mute position. the analog step size is split into a 3-db and a 1.5-db range: ? 75 db... ? 54 db: 3 db step size ? 54 db...0 db: 1.5 db step size the overall volume system, however, consists not only of the analog volume. an additional digital volume con- trol allows a step size of 0.5 db over the complete range. see section 2.2.2.7. ? volume and balance con- trol ? on page 13. please note that analog input signals (auxl, auxr) do not have the additional digital volume control. 2.1.5.6. line-out/headphone amplifier the line-out/headphone amplifier output is provided at the outl and outr pins connected either to stereo headphones or to the power amplifier within an usb speaker. the stereo headphones require external 47- ? serial resistors in both channels. see section 4. ? applications ? on page 26. 2.1.6. general purpose i/o the gpio pins are used to connect keys which are related to the usb hid class or for vendor-specific control functions and leds in order to indicate on/off states for example. the standard configuration defines the gpios as four input pins (gpio0...gpio3) and four output pins (gpio4...gpio7). the function of the input pins is shown in table 2 ? 2. the keys are polled by the microcontroller and the cor- responding key codes are transmitted to the host on request. the relation between key code and usage id (see universal bus hid usage tables, version 1.0, chapter 14 ? consumer page) is defined in the hid report descriptor (see section 2.2.1.4. ? hid report descriptor ? on page 11) which is transmitted to the host along with the configuration descriptor during the bus enumeration. when the device is not connected to usb, the func- tionality of the volume-control and mute pins are pre- served. in this case, however, the parameters are directly transferred to the dsp-core. this allows using the device in stand-alone mode providing volume and mute control for analog sources. the output pins are not predefined and therefore not related to any usb functions. they can be set or reset by vendor-specific software. the standard configuration can be changed also by vendor-specific usb software, but in this case, table 2 ? 2 is no longer valid. table 2 ? 2: standard key configuration pin function key code usage id gpio0 volume up 1 e9 gpio1 volume down 2 ea gpio2 mutetoggle 4 e2 gpio3 bassboost toggle 8 e5
uac 3552a preliminary data sheet 10 micronas 2.1.7. special i/o 2.1.7.1. sof (start of frame) the sof-pin provides a 1-ms signal which is synchro- nous to the usb 1-ms frame rate. it can be used for test purpose or as an usb-synchronous reference for vendor-specific external circuitry. 2.1.7.2. auxen this is a digital input that has to be used if an analog signal is connected to the aux r/l pins. it triggers the microcontroller to switch the input mixer to the analog input (the dac signal always remains active!) and it keeps the device from entering the low-power mode which can be requested by the host pc or by discon- necting the device from the usb. 2.1.7.3. suspend the suspend pin indicates the low-power mode. it can be used to power down external circuitry, like power amplifiers in an usb speaker. 2.1.8. clock system the uac 3552a requires a 12-mhz clock source, which is realized as an on-chip oscillator with external crystal. also an external oscillator can be used. in this case, the clock has to be connected to xti. the 12 mhz is the input clock for a pll circuit which gener- ates all clocks needed within the ic. 2.2. software the functionality of the uac 3552a is mainly defined by software. the internal -controller handles the usb requests whereas the audio processing unit pro- cesses the sound features. 2.2.1. usb microcontroller software 2.2.1.1. chapter 9 functions the chapter 9 of the usb spec 1.1 defines the usb device framework which is the middle layer of the usb protocol hierarchy (see usb spec 1.1 page 175). it handles routing data between the bus interface and various endpoints. the endpoint is a source or sink for data within the device. 2.2.1.2. device descriptor unlike the configuration descriptor, which is located in rom, the device descriptor is more flexible. the man- ufacturer-related data are stored in the on-chip eeprom, and can be adapted individually. in detail these data are ? vendor id ? product id ? device release number ? manufacturer string ? product string ? serial number string a comfortable programming tool allows this data to be defined and writes it into the corresponding eeprom location. the uac 3552a is shipped with the micronas device descriptor and allows usb functionality without any eeprom reprogramming. 2.2.1.3. string descriptor the string descriptor is located in the eeprom. the uac 3552a holds three strings. the programming tool handles the programming of strings and will take care of string length control also. the uac 3552a is shipped with the micronas string descriptor and allows usb functionality without any eeprom reprogramming. table 2 ? 3: suspend pin suspend low normal power high low power
preliminary data sheet uac 3552a micronas 11 2.2.1.4. hid report descriptor the hid report descriptor defines the functionality of the gpio pins. the basic information here are the usage ids for the key inputs. these ids are stored in the eeprom and can therefore be modified if the default configuration does not fit the application. the uac 3552a, however, only supports the default func- tions: volume up/down, mute on/off and bassboost on/ off. this means, that all nonstandard usage ids will be transmitted to the host on request and can be used with vendor specific software, but only the default ids will work together with the operating system. 2.2.2. audio processing software all audio processing is realized by dsp-software, apart from volume control which is located in the ana- log back-end. the audio building blocks split into usb- independent features, like sample rate conversion and oversampling filters and blocks which belong to the so called usb feature unit, defined in the usb device class definition for audio devices. the feature unit provides basic manipulation of the incoming logical channels. the uac 3552a supports two logical chan- nels (i.e. left & right). multichannel or surround sys- tems, however, can also be realized using more than one uac 3552a, because phase or delay distortion is eliminated by locking the audio processing to the usb frame rate. an overview of the architecture is given in fig. 2 ? 3. fig. 2 ? 3: audio processing 2.2.2.1. sample rate converter the purpose of the sample rate converter is first to transform the block transferred audio data into a con- tinuous data stream and second to convert all incom- ing sample rates to a fixed 50-khz sample rate. this technique eliminates input data jitter. furthermore, all audio algorithms and the dac run on a single sample rate and no parameter switching is required on change of audio sampling rate. furthermore, all audio clocks, such as sampling clock, noise-shaping clock, and dac-clock can be derived from a single free-running 12-mhz oscillator. this mechanism allows continuous input sampling rates from 5 khz up to 50 khz. 2.2.2.2. automatic gain control the automatic gain control (agc) is one of the build- ing blocks of the feature unit (usb device class defini- tion for audio devices 1.0, page 39). different sound sources fairly often do not have the same volume level. the automatic gain control solves this problem by equalizing the volume levels within a defined range. below a theshold level the signals are not affected. the level-adjustment is performed with time constants in order to avoid short-time adjustments due to signal peaks. feature unit bass/treble bass boost sample rate converter equalizer volume/ balance over- sampling agc
uac 3552a preliminary data sheet 12 micronas 2.2.2.3. bass control the bass control provides gain or attenuation to fre- quency components below a corner frequency of 120 hz. the characteristic is shown in fig. 2 ? 4. fig. 2 ? 4: bass control the bass control works identically on both channels. 2.2.2.4. treble control the treble control provides gain or attenuation to fre- quency components above a corner frequency of 6 khz. the characteristic is shown in fig. 2 ? 5. fig. 2 ? 5: treble control the treble control works identically on both channels. table 2 ? 4: bass control characteristics min max step ? 12 db +12 db 0.5 db 10. 50. 100. 500. 1000. 5000. 10000. -15 -10 -5 0 5 10 15 hz db table 2 ? 5: treble control characteristics min max step ? 12 db +12 db 0.5 db 10. 50. 100. 500. 1000. 5000. 10000. -15 -10 -5 0 5 10 15 hz db
preliminary data sheet uac 3552a micronas 13 2.2.2.5. bass boost control the bass boost algorithm provides an additional 12-db gain for the low-frequency components. the character- istic is shown in fig. 2 ? 6. fig. 2 ? 6: bass boost the bass boost works on both channels and can be switched on and off under usb control. 2.2.2.6. parametric equalizer the parametric equalizer is a non-usb audio feature. it allows the compensation of unwanted frequency responses of a speaker. alternatively, frequency responses can be set to suit individual tastes. the equalizer consists of 5 individually adjustable bands. the control parameters and the parameter range for each band is shown in table 2 ? 6. the adjustment of the equalizer is supported by an application program that allows to set up frequency responses and to download the corresponding filter coefficients into the uac 3552a. when the frequency response fits the target, it can be programmed into the on-chip eeprom. the uac 3552a is shipped with a flat frequency response. 2.2.2.7. volume and balance control the volume and balance control operate separately on the left and right channel. the volume control is realized in the analog back-end. this preserves high audio quality (snr) at low volume settings because signal and noise are attenuated in the same way, which is not the case for pure digital vol- ume control. the uac 3552a uses digital volume con- trol only for the fine tuning of the 0.5 db step size. the volume setting is smoothed by an internal ramping algorithm in order to avoid audible clicks during volume change. the splitting between analog and digital volume is han- dled by the uac 3552a automatically. 2.2.3. mute control the mute control is part of the volume system in the uac 3552a. it functions simultaneously on both chan- nels and can be switched on and off under usb con- trol. as with the volume control, clicks are avoided by a ramping algorithm. 2.2.3.1. oversampling the oversampling filter increases the audio sampling rate by a factor of 4. the final upsampling to the noise- shaping rate is handled by a sample and hold circuit. the pass-band characteristic of the oversampling filter is shown in fig. 2 ? 7. fig. 2 ? 7: 1 to 4 oversampling filter, pass-band table 2 ? 6: equalizer parameters parameter min max center frequency 50 hz 15 khz gain/attenuation ? 6db +6db filter quality (q) 0.5 3 hz db 10. 20. 50. 100. 200. 500. 1000. 0 2 4 6 8 10 12 14 table 2 ? 7: volume and balance control min max step ? 75 db 0 db 0.5 db 0 5000 10000 15000 20000 -0.5 -0.4 -0.3 -0.2 -0.1 0 khz db
uac 3552a preliminary data sheet 14 micronas 3. specifications 3.1. outline dimensions fig. 3 ? 1: 44-pin plastic metric quad flat pack (pmqfp44) weight approximately 0.4 g dimensions in mm 3.2. pin connections and short descriptions nc = not connected, leave vacant lv = if not used, leave vacant vss = if not used, connect to vss x = obligatory; connect as described in circuit diagram vdd = connect to vdd spgs0006-3(p44)/1e 34 44 1 11 12 22 23 33 1.3 1.75 1.75 0.1 0.8 0.8 13.2 0.2 13.2 0.2 0.17 0.06 2.15 0.2 2.0 0.1 0.375 0.075 10 0.1 10 0.1 10 x 0.8 = 8 0.1 10 x 0.8 = 8 0.1 pin no. pin name type connection (if not used) short description 1 agndc in/out x analog reference voltage 2 avss1 in x vss 1 for audio back-end 3 avss0 in x vss 0 for audio output amplifiers 4 outl out lv audio output: headphone left or speaker + 5 outr out lv audio output: headphone right or speaker ? 6 avdd0 in x vdd 0 for audio output amplifiers 7 avdd1 in x vdd 1 for audio back-end 8 xti in x quartz oscillator pin 1 9 xto out x quartz oscillator pin 2 10 nc lv not connected 11 nc lv not connected 12 nc lv not connected 13 nc lv not connected 14 gpio 0 in vss hid io 0 15 gpio 1 in vss hid io 1
preliminary data sheet uac 3552a micronas 15 16 gpio 2 in vss hid io 2 17 gpio 3 in vss hid io 3 18 nc lv not connected 19 gpio 4 out lv hid io 4 20 gpio 5 out lv hid io 5 21 gpio 6 out lv hid io 6 22 gpio 7 out lv hid io 7 23 trdy out lv test output pin 24 dminus in/out x usb data minus 25 dplus in/out x usb data plus 26 vreg out x capacitor for internal supply 27 vdd in x digital vdd 28 vss in x digital vss 29 test in x test enable 30 resq in vdd power on reset, active low 31 suspend out lv low-power mode indicator 32 sof out lv 1-ms start-of-frame signal 33 auxen in vss enable aux input 34 nc lv not connected 35 nc lv not connected 36 auxl in vss aux input left 37 auxr in vss aux input right 38 foutl out x output to left external filter 39 fopl in/out x filter op amp inverting input, left 40 finl in/out x input for filtoutl or filter op amp output (line out) 41 foutr out x output to right filter op amp 42 fopr in/out x right filter op amp inverting input 43 finr in/out x input for filtoutr or filter op amp output (line out) 44 vref in x analog reference ground pin no. pin name type connection (if not used) short description
uac 3552a preliminary data sheet 16 micronas 3.3. pin descriptions 3.3.1. power supply pins the uac 3552a combines various analog and digital functions which may be used in different modes. for optimized performance, major parts have their own power supply pins. all vss power supply pins must be connected. vdd (27) vss (28) the vdd and vss power supply pair are connected internally with all digital parts of the uac 3552a . avdd0 (6) avss0 (3) avdd0 and avss0 are separate power supply pins that are exclusively used for the on-chip headphone/ loudspeaker amplifiers. avdd1 (7) avss1 (2) the avdd1 and avss1 pins supply the analog audio processing parts, except the headphone/loudspeaker amplifiers. 3.3.2. analog audio pins agndc (1) reference for analog audio signals. this pin is used as reference for the internal op amps. this pin must be blocked against vref with a 3.3- f capacitor. note: the pin has a typical dc-level of 2.25 v. it can be used as reference input for external op amps when no current load is applied. vref (44) reference ground for the internal band-gap and bias- ing circuits. this pin should be connected to a clean ground potential. any external distortions on this pin will affect the analog performance of the uac 3552a. dminus (24) dplus (25) differential usb port pins. auxl (36) auxr (37) the aux pins provide two analog stereo inputs. auxil- iary input signals, e.g. the output of a conventional receiver circuit or the output of a tape recorder can be connected with these inputs. the input signals have to be connected by capacitive coupling. foutl (38) fopl (39) finl (40) foutr (41) fopr (42) finr (43) filter op amps are provided in the analog baseband signal paths. these inverting op amps are freely accessible for external use by these pins. the foutl/r pins are connected with the buffered output of the internal switch matrix. the fopl/r-pins are directly connected with the inputs of the inverting filter op amps. the finl/r pins are connected with the outputs of the op amps. outl (4) outr (5) the outl/r pins are connected to the internal output amplifiers. they can be used for either line-out or ste- reo headphones. caution: a short circuit at these pins for more than a momentary period may result in destruction of the internal circuits. xti (8) xto (9) the xti pin is connected to the input of the internal crystal oscillator; the xto pin to its output. both pins should be directly connected to the crystal and two ground-connected capacitors (see application dia- gram).
preliminary data sheet uac 3552a micronas 17 3.3.3. other pins test (29) test enable. this pin is for test purposes only and must always be connected to vss. vreg (26) this pin is used to connect an external buffer capacitor to stabilize the internal supply for the usb transceiver. resq (30) this pin may be used to reset the chip. gpio 0 ... gpio 7 (14,15,16,17,19,20,21,22) these pins are configurable to be either input or output and can be used to connect audio function keys or sig- nalling leds. suspend (31) this pin indicates that the host pc sets the usb bus to the suspend-mode state. sof(32) start of frame signal. 1-ms signal that can be used for external application circuits. auxen (33) aux enable. this pin must be connected to vss if an analog source is connected to the aux input. other- wise connect to vdd. trdy (23) test output pin. this pin is intended for test purposes only and must not be connected. 3.4. pin configuration fig. 3 ? 2: 44-pin pmqfp package 34 35 36 37 38 39 40 41 42 43 44 22 21 20 19 18 17 16 15 14 13 12 1234567891011 33 32 31 30 29 28 27 26 25 24 23 nc nc auxl auxr foutl fopl finl foutr fopr finr vref gpio 7 gpio 6 gpio 5 gpio 4 nc gpio 3 gpio 2 gpio 1 gpio 0 nc nc sof suspend resq test vss auxen vdd vreg dplus dminus trdy avss1 avss0 outl outr avdd0 agndc avdd1 xti xto nc nc uac 3552a
uac 3552a preliminary data sheet 18 micronas 3.5. pin circuits fig. 3 ? 3: pins finr, fopr, finl, fopl agndc fopn finn foutn ext. filter network fig. 3 ? 4: pins agndc, vref 125 k ? avss0/1 agndc vref fig. 3 ? 5: output pins foutl, foutr agndc foutn fig. 3 ? 6: output/input pins xti, xto 500 k ? xti xto fig. 3 ? 7: input pins resq, test, auxen fig. 3 ? 8: input pins auxl/r agndc auxl/r fig. 3 ? 9: output pins outl, outr outn agndc dv sup p n gnd fig. 3 ? 10: digital output pins sof, suspend fig. 3 ? 11: digital input/output pins dminus, dplus dplus dminus dv sup p n gnd fig. 3 ? 12: input/output pins gpio0...gpio7
preliminary data sheet uac 3552a micronas 19 3.6. electrical characteristics 3.6.1. absolute maximum ratings stresses beyond those listed in the ? absolute maximum ratings ? may cause permanent damage to the device. this is a stress rating only. functional operation of the device at these or any other conditions beyond those indicated in the ? recommended operating conditions/characteristics ? of this specification is not implied. exposure to absolute maximum ratings conditions for extended periods may affect device reliability. symbol parameter pin name min. max. unit t a ambient operating temperature 0 70 c t s storage temperature ? 40 125 c p pmax power dissipation ? 900 mw v supa analog supply voltage 1) avdd0/1 ? 0.3 6 v v supd digital supply voltage ? 0.3 6 v v idig input voltage, all digital inputs ? 0.3 v supd + 0.3 v i idig input current, all digital inputs ? 5+0.5ma i idig input current, all digital outputs ? 88 ma i odig output current, all digital outputs ? 14.8 14.8 ma v iana input voltage, all analog inputs ? 0.3 v supa + 0.3 v i iana input current, all analog inputs ? 5 ? 5ma i oaudio output current, audio output 2) outl/r 0.2 a 1) both have to be connected together! 2) these pins are not short-circuit proof!
uac 3552a preliminary data sheet 20 micronas 3.6.2. recommended operating conditions symbol parameter pin name min. typ. max. unit temperature ranges and supply voltages t a ambient temperature range 0 70 c v supa1 analog audio supply voltage avdd0/1 4.5 5.0 5.5 v v supd digital supply voltage vdd 4.5 5.0 5.5 v relative supply voltages v supa analog audio supply voltage in relation to the digital supply volt- age avdd0/1 v supd ? 0.25 v 5.5 v v il input voltage low gpi[7:0], auxen, 0.25 v supd v ih input voltage high gpi[7:0], auxen 0.75 v supd v ril reset input high-low transition voltage resq 0.45 v supd v rih reset input low-high transition voltage resq 0.8 v supd t rl reset low time after vdd stable and oscillator start-up resq 5 s analog reference c agndc1 analog reference capacitor agndc 1.0 3.3 f c agndc2 analog reference capacitor agndc 10 nf analog audio inputs v ai analog input voltage ac auxl/r 0.525 1.05 v rms analog filter input and output z aflo analog filter load output 1) foutl/r 7.5 6 k ? pf z afli analog filter load input 1) finl/r 5.0 7.5 k ? pf analog audio output z aol_hp analog output load hp (47 ? series resistor required) outl/r 32 400 ? pf
preliminary data sheet uac 3552a micronas 21 quartz characteristics t ac ambient temperature range 0 70 c f p load resonance frequency at c l = 20 pf 12 mhz ? f/f s accuracy of adjustment ? 20 20 ppm ? f/f s frequency variation versus temperature ? 20 20 ppm r eq equivalent series resistance 12 30 ? c 0 shunt (parallel) capacitance 3 5 pf voltage regulator c vreg1 voltage regulator capacitor vreg 1.0 3.3 f c vreg2 voltage regulator capacitor vreg 10 nf transceiver r usb input serial resistance dplus/ dminus 24 ( 0.5 %) ? c usb shunt capacitor dplus/ dminus 22 pf 1) please refer to section 4.1. ? recommended low-pass filters for analog outputs ? on page 26. symbol parameter pin name min. typ. max. unit
uac 3552a preliminary data sheet 22 micronas 3.6.3. characteristics at t a = 0 to 70 c, v supd = 4.75 v to 5.25 v, v supa = 4.75 v to 5.25 v; typical values at t j =27 c, v supd =v supa = 5.0 v, quartz frequency = 12 mhz, duty cycle = 50 %, positive current flows into the ic bass/treble: 0 db, bass boost: off, agc: off, equalizer: off symbol parameter pin name min. typ. max. unit test conditions digital supply i vdd current consumption 1) vdd 100 125.5 ma v supd =5 v digital input pin ? leakage i i input leakage current gpio[7:0], auxen, resq 1 av gnd v i v sup digital output pin v oh output high voltage gpio[7:0], suspend, sof v supd ? 0.4 vi out =8 ma v ol output low voltage 0.4 v analog supply i avdd current consumption analog audio 11 2 15 ma ma suspd = 0, mute suspd = 1, mute psrr aa power supply rejection ratio for analog audio output avdd0/1, outl/r 50 db 1 khz sine at 100 mv rms 20 db 100 khz sine at 100 mv rms reference frequency generation v dcxti dc voltage at oscillator pins xti/o 0.5 * v supa v c li input capacitance at oscillator pin xti 3 pf c lo input capacitance at oscillator pin xto 3 pf v xtalout voltage swing at oscillator pins (peak-peak) xti/o 0.6 * v supa 1.0 * v supa v oscillator start-up time 10 ms eeprom eeprom unpowered data retention 10 year number of write cycles 100 1) no load attached to gpio ? s
preliminary data sheet uac 3552a micronas 23 usb transceiver v reg regulator voltage vreg 3.25 3.4 3.55 v c l =1 f r o driver output resistance including the 24- ? external serial resistor dplus/ dminus 28 43 ? static, low or high t r / t f rise and fall times dplus/ dminus 420nsc l =50 pf, driver mode ma_trtf rise/fall time matching dplus/ dminus 90 111.1 % c l =50 pf, driver mode v xover crossover voltage dplus/ dminus 1.3 2.0 v c l =50 pf, driver mode v cm_drec differential receiver common-mode range dplus/ dminus 0.8 2.5 v v t_srec single-ended receiver threshold voltage dplus/ dminus 0.8 2.0 v analog audio v agndc analog reference voltage agndc 2.25 v r l >> 10 m ?, referred to vref r iaux input resistance at input pins auxl/r 12.1 11.6 15 17.9 19.0 k ? k ? t j = 27 c t a = 0 to 70 c input selected, suspd = 0 i = 10 a, referred to vref 24.2 23.3 30 35.8 37.9 k ? k ? t j = 27 c t a = 0 to 70 c input not selected suspd = 1 i = 10 a, referred to vref r oout output resistance at output pins outl/r 700 ? t j = 27 c suspd = 1 i = 200 a, referred to vref r ofilt output resistance of filter pins finl 15 k ? suspd = 1, mute i = 10 a, referred to vref finr 11.25 k ? v offi offset voltage at input pins auxl/r ? 20 20 mv suspd = 0, referred to agndc v offo offset voltage at output pins outl/r ? 10 10 mv suspd = 0, mute referred to agndc v offfi offset voltage at filter output pins foutl/r ? 20 20 mv suspd = 0, referred to agndc v offfo offset voltage at filter input pins finl/r ? 20 20 mv suspd = 0, referred to agndc dv dcpd difference of dc voltage at output pins after back-end low power sequence outl/r ? 10 10 mv analog gain = mute, suspd switched from 0 to 1 symbol parameter pin name min. typ. max. unit test conditions
uac 3552a preliminary data sheet 24 micronas r d/a d/a pass band ripple outl/r, foutl/r 0.01 db 0...22 khz (no external filters used) a d/a d/a stop band attenuation 60 db 31 khz...164 khz (no external filters used) bw aux bandwidth for auxiliary inputs auxl/r, finl/r 760 khz thd hp total harmonic distortion outl/r 0.05 % bw = 20 hz...0.5 fs, unweighted, r l 32 ? (47 ? series resistor required), analog gain = 0 db, input 1 khz at ? 3dbfs snr aux signal-to-noise ratio from analog input to outputs auxn, outl/r 96 db input ? 40 db below 1.05 v rms snr 1 signal-to-noise ratio outl/r 89 91 db r l 32 ? (external 47 ? series resistor required) bw =20hz...0.5fs unweighted, analog gain = 0 db, input = ? 20 dbfs snr 2 signal-to-noise ratio outl/r 58 62 db r l 32 ? (external 47 ? series resistor required) bw = 20 hz..0.5 fs unweighted analog gain= ? 40.5 db, input = ? 3dbfs lev mute mute level outl/r ? 110 dbv bw = 20 hz...22 khz unweighted, no digital input signal, analog gain = mute v ao analog output voltage ac outl/r 1.0 1.05 1.1 v rms r l > 5 k ?, analog gain = 0 db input = 0 dbfs digital g aux gain from auxiliary inputs to outputs auxl/r, outl/r ? 0.5 0 0.5 db f = 1 khz, sine wave, r l >5k ? 0.5 v rms to auxl/r p hp output power (headphone) outl/r 12 mw r l = 32 ?, analog gain = +2 db, distortion < 1%, external 47 ? series resistor required symbol parameter pin name min. typ. max. unit test conditions
preliminary data sheet uac 3552a micronas 25 g ao analog output gain setting range outl/r ? 75 18 db dg ao1 analog output gain step size outl/r 3.0 db analog gain: ? 75 db...-54 db dg ao2 analog output gain step size outl/r 1.5 db analog gain: ? 54 db...+18 db e ga1 analog output gain error outl/r ? 2 2 db analog gain = ? 54 db e ga2 analog output gain error outl/r ? 1 1 db analog gain = ? 45 db e ga3 analog output gain error outl/r ? 0.5 0.5 db analog gain = ? 39 db e dga analog output gain step size error outl/r ? 0.5 0.5 db analog gain = ? 48 db xtalk hp crosstalk left/right channel (headphone) outl/r ? 70 ? 80 db f = 1 khz, sine wave, outl/r: r l 32 ? (47 ? series resistor required) analog gain = 0 db, input = ? 3 dbfs or 0.7 v rms to auxl/r xtalk 2 crosstalk between input signal pairs auxnl/r ? 70 ? 80 db f = 1 khz, sine wave, foutl/r: r l > 7.5 k ? outl/r: r l 32 ? (47- ? series resistor required) analog gain = 0 db, input = ? 3 dbfs and 0.7 v rms to auxl/r symbol parameter pin name min. typ. max. unit test conditions
uac 3552a preliminary data sheet 26 micronas 4. applications 4.1. recommended low-pass filters for analog outputs 1) fig. 4 ? 1: 1st-order low-pass filter fig. 4 ? 2: 2nd-order low-pass filter 1) without deemphasis circuit fig. 4 ? 3: 3rd-order low-pass filter table 4 ? 1: attenuation of 1st-order low-pass filter frequency gain 24 khz ? 2.2 db 30 khz ? 3.0 db table 4 ? 2: attenuation of 2nd-order low-pass filter frequency gain 24 khz ? 1.5 db 30 khz ? 3.0 db 330 pf 15 k ? 15 k ? 1st-order ? finl(r) fopl(r) foutl(r) 11 k ? 220 pf 11 k ? 11 k ? 1.0 nf ? finl(r) fopl(r) foutl(r) 2nd-order avss table 4 ? 3: attenuation of 3rd-order low-pass filter frequency gain 18 khz 0.17 db 24 khz ? 0.23 db 30 khz ? 3.00 db ? finl(r) fopl(r) foutl(r) 15 k ? 120 pf 7.5 k ? 7.5 k ? 1.8 nf 1.8 nf 7.5 k ? 3rd-order avss
preliminary data sheet uac 3552a micronas 27 4.2. typical application fig. 4 ? 4: application circuit d+ res q gpio0 gpio3 gpio5 auxen gpio6 gpio1 test gpio7 gpio4 vreg vreg gpio2 res q d- 5vdi g 5vdi g 5vana 5vdi g 5vdi g 5vana 5vdi g r9 11k r5 11k c1 1n r14 11k r10 11k c3 1n r20 47 r22 47 r19 1k r23 1k p1 8vdc c7 470n r18 11k + c23 47u/16v c22 100n r29 sin g le connection point l1 ferrite bead r27 24 0.5% r26 24 0.5% r8 1k r13 1k r1 11k c17 c18 r4 1k d1 led j15 usb series b 1 2 3 4 c14 10n d3 led d4 led c5 220p y1 12mhz r25 1.5k c6 470n r15 1k d2 led + c8 160u/16v + 160u/16v r7 11k c4 220p r3 11k r11 11k r12 11k + c10 3.3u/16v j13 rca left c19 100n r16 150k c20 100n r21 11k j7 phonejack stereo sw 2 3 4 5 1 j11 phonejack stereo sw 2 3 4 5 1 r6 11k r17 1k d5 1n4001 r28 680 r24 680 +c21 47u/16v c11 100n c16 100n lm7805 vin 1 gnd 3 vout 2 j14 d- 1 j16 d+ 1 j12 left 1 j17 ri g ht 1 u1 UAC3552A agndc 1 avss1 2 avss0 3 outl 4 outr 5 avdd0 6 avdd1 7 xti 8 xto 9 nc0 10 nc1 11 nc2 12 nc3 13 nc4 18 nc5 34 nc6 35 gpio0 14 gpio1 15 gpio2 16 gpio3 17 gpio4 19 gpio5 20 gpio6 21 gpio7 22 trdy 23 dminus 24 dplus 25 vreg 26 vdd 27 vss 28 test 29 res# 30 suspend 31 sof 32 auxen 33 auxl 36 auxr 37 foutl 38 fopl 39 finl 40 foutr 41 fopr 42 finr 43 vref 44 s4 bass boost s3 mute s2 volume down s1 volume up c2 470n r2 220k c16 470n 22p 22p c9 j18 rca right 22p 22p u2 uac 3552a
all information and data contained in this data sheet are without any commitment, are not to be considered as an offer for conclusion of a contract, nor shall they be construed as to create any liability. any new issue of this data sheet invalidates previous issues. product availability and delivery are exclusively subject to our respective order confirmation form; the same applies to orders based on development samples deliv- ered. by this publication, micronas gmbh does not assume responsibil- ity for patent infringements or other rights of third parties which may result from its use. further, micronas gmbh reserves the right to revise this publication and to make changes to its content, at any time, without obligation to notify any person or entity of such revisions or changes. no part of this publication may be reproduced, photocopied, stored on a retrieval system, or transmitted without the express written consent of micronas gmbh. uac 3552a preliminary data sheet 28 micronas micronas gmbh hans-bunte-strasse 19 d-79108 freiburg (germany) p.o. box 840 d-79008 freiburg (germany) tel. +49-761-517-0 fax +49-761-517-2174 e-mail: docservice@micronas.com internet: www.micronas.com printed in germany order no. 6251-487-1pd 5. data sheet history 1. preliminary data sheet: ? uac 3552a universal serial bus dac, nov. 9, 1999, 6251-487-1pd. first release of the preliminary data sheet.

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