integrated mixed-signal solutions product brief stac9766/67 two-channel, 20-bit, ac?97 2.3 codecs with stereo microphone and mic/jack sensing features for rev. cc1 parts and beyond high performance ? technology ac ? 97 rev 2.3 complaint 20-bit full duplex stereo adc & dacs independent sample rates for adc & dacs 5-wire ac-link protocol compliance 20-bit spdif output full stereo microphone pre-amp internal jack sensing on headphone & line_out internal microphone input sensing digital pc beep option extended ac ? 97 2.3 paging registers digital-ready status general purpose i/o crystal elimination circuit headphone drive capability (50mw) 0, 10db, 20db, and 30 db microphone boost capability +3.3v (stac9767) and +5v (stac9766) analog power supply options pin compatible with stac9700/21/56 1 0 0 % c o m p a t i b l e w i t h s t a c 9 7 5 0 / 5 2 sigmatel surround (ss3d) stereo enhancement energy saving dynamic power modes multi-codec option (intel ac'97 rev 2.3) six analog line-level inputs 103db snr line-line description sigmatel?s stac9766/67 (revision cc1 and beyond) are general purpose 20-bit, full duplex, audio codecs conforming to the analog compo- nent specification of ac?97 (audio codec 97 com- ponent specification rev. 2.3). the stac9766/67 incorporates sigmatel?s proprietary ? technol- ogy the ac ? 97 codec is designed to achieve a dac snr in excess of 103db. the dacs, adcs, and mixer are integrated with analog i/os, which include four analog line-level stereo inputs, two analog line-level mono inputs, two stereo outputs, and one mono output channel. the stac9766/67 includes digital input/output capability for support of modern pc systems with an output that sup- ports the spdif format. the stac9766/67 is a standard 2-channel stereo codec. with sigmatel ? s headphone drive capability, headphones can be driven with without an external amplifier. the stac9766/67 may be used as a secondary codec, with the stac9700/21/56/08/84/50/52 as the primary, in a multiple codec configuration con- forming to the ac'97 rev. 2.3 specification. this configuration can provide true six-channel, ac-3 playback required for dvd applications. the stac9766/67 communicates via the five-wire ac- link to any digital component of ac'97 providing flexibility in the audio system design. packaged in an ac'97 compliant 48-pin tqfp, the stac9766/ 67 can be placed on the motherboard, daughter boards, pci, amr, cnr, mdc or acr cards. the stac9766/67 provides variable sample rate digital-to-analog (da) and analog-to-digital (ad) conversion, mixing, and analog processing. ordering information part number package temp range supply range stac9766t 48-pin tqfp 7mm x 7mm x 1.4mm 0 c to +70 c dvdd = 3.3v, avdd = 5.0v stac9767t 48-pin tqfp 7mm x 7mm x 1.4mm 0 c to +70 c dvdd = 3.3v, avdd = 3.3v 2-9766-p1-4.0-0802
2 2-9766-p1-4.0-0802 stac9766/67 two-channel, 20-bit, ac ? 97 2.3 codecs with stereo microphone and mic/jack sensing description (continued) supported audio sample rates include 48 khz, 44.1 khz, 32 khz, 22.05 khz, 16 khz, 11.025 khz, and 8 khz; additional rates are supported in the stac9766/67 soft audio drivers. all adc ? s and dac ? s operate at 20-bit resolution. two 20-bit dacs convert the digital stereo pcm-out content to audio. the mixer block combines the pcm_out with any analog sources, to drive the line_out and hp_out outputs. the mono_out delivers either mic only, or a mono mix of sources from the mixer. the stereo variable sample rate 20-bit adc ? s provide record capability for any mix of mono or stereo sources, and deliver a digital stereo pcm-in signal back to the ac- link. the microphone input and mono mix input can be recorded simultaneously, thus allowing for an all digital output in support of the digital ready initiative. for a digital ready record path, the microphone is connected to the left channel adc while the mono output of the stereo mixer is connected to right channel adc. the stac9766/67 inculdes full stereo microphone pre-amp support and can be used with the 10, 20 and 30db microphone boost options. this integration allows for addi- tional cost savings and options. the stac9766/67 includes jack sensing on the headphone and line_out. the stac9766/67 jack sense can detect the presence of devices on the headphone and line outputs and on both mic inputs. with proprietary sigmatel current and impedance- sensing techniques, the impedance load on the headphone and line outputs can also be detected. the gpios on the stac9766/67 remain available for advanced configura- tions unlike previous jack sense implementations. the stac9766/67 implementation of jack sense uses the extended paging registers defined by the ac ? 97 2.3 specification. this allows for additional registry space to hold the identification information about the codec, the jack sensing details and results, and the external surroundings of the codec. the information within the extended paging reg- isters will allow for the automatic configuration of the audio subsystem without end-user intervention. for example, the bios can populate the extended paging registers with valuable information for both the audio driver and the operating system such as gain and attenuation stages, input population and input phase. with this input information, the sig- matel driver will automatically provide to the volume control panel only the volume slid- ers that are implemented in the system, thus improving the end-user ? s experience with the pc. the information in the extended paging registers will also allow for automatic configura- tion of microphone inputs, the ability to switch between spdif and analog outputs, the routing of the master volume slider to the proper physical output, and softeq configura- tions. the fully parametric sigmatel softeq can be initiated upon jack insertion and sensed impedance levels. the stac9766/67 also offers 2 styles of pc beep, analog and digital. the digital pc beep is a new feature added to the ac ? 97 specification rev 2.3. the stac9766/67 is designed primarily to support stereo (2-speaker) audio. true ac-3 playback can be achieved for 6-speaker applications by taking advantage of the multi- codec option available in the stac9766/67 to support two or three codecs in an ac'97 architecture. additionally, the stac9766/67 provides for a stereo enhancement feature, sigmatel surround 3d (ss3d). ss3d provides the listener with several options for improved speaker separation beyond the normal 2 or 4-speaker arrangements. the stac9766/67 can be soundblaster ? and windows sound system ? compatible with sigmatel ? s wdm driver for windows 98/2k/me/xp. soundblaster is a registered trade- mark of creative labs. windows is a registered trademark of microsoft corporation.
2-9766-p1-4.0-0802 3 stac9766/67 two-channel, 20-bit, ac ? 97 2.3 codecs with stereo microphone and mic/ key specifications analog line_out snr: 103 db digital dac snr: 95 db digital adc snr: 85 db full-scale total harmonic distortion: 0.002% crosstalk between input channels: -70 db spurious tone rejection: 100 db related materials data sheet reference designs stac9766/67 block diagram hp_out ac-link digital interface registers 64x16 bits sync bit_clk sdata_out sdata_in reset# power management dac dac adc adc pcm out dacs pcm in adcs 4 stereo sources 2 mono sources mono_out stereo or mono mic boost 0,10,20 or 30 db mic1 (l) stereo mono mixer analog mixing and gain control m u x mic2 (r) line_out multi-codec cid0 cid1 spdif variable sample rate 20-bit dacs and 20-bit adcs eapd gpio0 gpio1
4 2-9766-p1-4.0-0802 stac9766/67 two-channel, 20-bit, ac ? 97 2.3 codecs with stereo microphone and mic/jack sensing stac9766/67 mixer figure 1. stac9766 2-channel mixer functional diagram 0ah 0ch 0eh 10h 12h 16h 14h pc _ beep phone cd au x vid eo linein mic 1 mic 2 20h:d8 10, 20 or 30 db allanalog v s allr e c o r d 6e h:d12 -6db mu x adc 04h mo n o volume ma s t e r volume 3d line_out 3d hp_out 02h 06h mux 1c h 20h:d15 analog au d io sources slot select slot select mux pcm to spdif spdif pc mout 2a h:d5-d4 28h: d5-d4 pcmin 20h:d13 22h:d2-d3 1a h -6db mo n o a n a l o g stereoanalog di gital key 20h:d9 adcrecord mux vol mute vol mute vol mute vol mute vol mute vol mute vol mute vol mute mux dac record volume 6a h:d1 18h headphone volume mono_out 0e h:d6 & 6e :d2 slot select di gital pcbeep 38h:d5-d4 20h:d13 22h:d2-d3 figure 2. stac9767 2-channel mixer functional diagram 0ah 0ch 0eh 10h 12h 16h 14h pc _beep ph on e cd au x vid eo linein mic 1 mic 2 20h:d8 10, 20 or 30 db allanalog v s allrecord 6eh:d12 -6db mu x adc 04h mono volume ma s t e r volume 3d line_out 3d hp_out 02h 06h mux 1ch 20h:d15 an alo g au d i o sou r c es slot select slot select mux pcm to spdif spdif pc mou t 2a h:d5-d4 28h: d5-d4 pcmin 20h:d13 22h:d2-d3 1ah -6db monoanalog stereoanalog di gi tal key 20h:d9 adcrecord mux vol mute vol mute vol mute vol mute vol mute vol mute vol mute vol mute mux dac record volume 6a h:d1 18h headphone volume mono_out 0e h:d6 & 6e :d2 slot select di gi tal pcbeep 38h:d5-d4 20h:d13 22h:d2-d3
2-9766-p1-4.0-0802 5 stac9766/67 two-channel, 20-bit, ac ? 97 2.3 codecs with stereo microphone and mic/ pin description additional support additional product and company information can be obtained by going to the sigmatel website at: www.sigmatel.com dvdd1 1 xtl_in 2 xtl_out 3 dvss1 4 sdata_out 5 bit_clk 6 dvss2 7 sdata_in 8 dvdd2 9 sync 10 reset# 11 pc_beep 12 24 line_in_r 23 line_in_l 22 mic2 21 mic1 20 cd_r 19 cd_gnd 18 cd_l 17 video_r 16 video_l 15 aux_r 14 aux_l 13 phone 36 line_out_r 35 line_out_l 34 nc 33 nc 32 cap2 31 nc 30 afilt2 29 afilt1 28 vrefout 27 vref 26 avss1 25 avdd1 mono_out 37 avdd2 38 hp_out_l 39 hp_comm 40 hp_out_r 41 avss2 42 gpio0 43 gpio1 44 cid0 45 cid1 46 eapd 47 spdif 48 figure 3. stac9766/67 pin description drawing 48-pin tqfp
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