ref: qs7785r1.doc qs7785 data sheet -- preliminary date: 06/11/99 rev: 1.00 qsound labs, inc. page 1 of 10 QS7785CF/qs7785pf qsound multi-speaker system device specifications - preliminary information overview: the qs7785 is a 3d audio processor ic that creates 5 speaker surround sounds from 2 channel stereo source using qsurround tm technology developed and licensed by qsound labs, inc. this chip synthesizes and outputs surround sounds from 2 channel stereo signal for surround speakers as well as an enhanced stereo sound for front speakers. feature: 3d synthesized surround sound for left and right surround speakers 3d stereo sound enhancement for left and right front speakers center speaker output parallel and serial digital interface for mode control ? QS7785CF for i 2 c 2 control pins serial interface ? qs7785pf for 3 control pins serial interface (data, clock and strobe) dc 5 to 13 volt supply 48-pin qfp packaging application: audio systems including tv, av amps, dvd, vcd, svcd and vcr resynthesis of multi-speaker output from down-mixed surround source. (dvd etc) car audio computer-based multimedia products, including sound cards, powered loud speakers pin configuration: i 2 c serial interface 3 cont rols serial interface
ref: qs7785r1.doc qs7785 data sheet -- preliminary date: 06/11/99 rev: 1.00 qsound labs, inc. page 2 of 10 QS7785CF/qs7785pf qsound multi-speaker system device specifications - preliminary information packaging dimension: ic block diagram:
ref: qs7785r1.doc qs7785 data sheet -- preliminary date: 06/11/99 rev: 1.00 qsound labs, inc. page 3 of 10 QS7785CF/qs7785pf qsound multi-speaker system device specifications - preliminary information pin functions : number name i/o description parallel serial 1 q1cc4 o capacitor 2 q1dc1 i capacitor 3 q1dc2 i capacitor 4 q1dc3 i capacitor 5 q1dc4 i capacitor 6 gnd - ground 7 v dig - digital power supply 8 p/s i interface mode control (h: parallel i/o, l: serial i/o) spd i front enhancementcontrol (h: high spread, l: low spread) 9 strb i serial data strobe(not applicable to i 2 c of QS7785CF) 10 mono i monaural to virtual stereo control (see operating mode for detail) 11 cnt i center output control (h: center on, l: center off) byp i bypass control (see operating mode for detail) 12 sda i/o serial data input (also ack data output for i 2 c of QS7785CF) sur i surround output control (see operating mode for detail) 13 scl i serial data shift clock 14 bass i bass boost control (h: on, l: off) 15 mute i output mute control (h: mute on, l: mute off) 16 psave i power save control (h: power save on, l: power save off) 17 v ref out o buffered reference voltage (v ana /2) 18 n/c (not used) - - 19 v ref in - signal reference input (self biased to v ana /2) 20 cclp i capacitor 21 cin i center signal input to mix with front signal 22 cout o center signal output 23 slout o surround left signal output 24 srout o surround right signal output 25 flout o front left signal output 26 frout o front right signal output 27 qxbc4 i capacitor 28 qxbc3 i capacitor 29 qxbc2 i capacitor 30 qxbc1 i capacitor 31 v ana - analog power supply 32 qxac4 i capacitor 33 qxac3 i capacitor 34 qxac2 i capacitor 35 qxac1 i capacitor 36 basinr i auxiliary right input for the bass boost (enabled on bass = h) 37 rin i right channel signal input 38 lin i left channel signal input 39 basinl i auxiliary left input for the bass boost (enabled on bass = h) 40 msc6 i capacitor 41 msc5 i capacitor 42 msc4 i capacitor 43 msc3 i capacitor 44 msc2 i capacitor 45 msc1 i capacitor 46 q1cc1 i capacitor 47 q1cc2 i capacitor 48 q1cc3 i capacitor
ref: qs7785r1.doc qs7785 data sheet -- preliminary date: 06/11/99 rev: 1.00 qsound labs, inc. page 4 of 10 QS7785CF/qs7785pf qsound multi-speaker system device specifications - preliminary information electrical specification: absolute maximum ratings parameter symbol rating unit supply voltage range (analog) v ana -0.3 to 15, and v ana >v dig -0.3 v supply voltage range (digital) v dig -0.3 to 7 v input voltage range (analog) v iana -0.3 to v ana +0.3 v input voltage range (digital) v idig -0.3 to v dig +0.3 v power dissipation p d mw storage temperature range tstg -40 to 125 c soldering temperature t sld 255 c soldering time t sld 10 sec recommended operating condition parameter symbol limits unit operating voltage (analog) v ana 5 to 13 and v ana 3 v dig v operating voltage (digital) v dig 4.5 to 5.5 v operating temperature range t opr 0 to 70 c electrical chracteristics (v ana =9v,v dig =5v ta=25 c unless otherwise noted) parameter symbol condition limits/min limits/typ limits/max unit input voltage v in1 1.1 v rms analog input impedance1 z ain1 l in , r in 20 k w analog input impedance2 z ain2 c in 10 k w reference voltage out v refout v ana /2 v high level input voltage v ih 2.4 v low level input voltage v il 0.5 v high level input current i ih v in =v cc m a low level input current i il v in =gnd m a scl width high t 1 4.0 m s scl width low t 2 4.7 m s set-up time, sda to scl t 3 250 ns hold time, scl to sda t 4 5.0 m s set-up time, scl to strb t 5 250 n s strb width high t 6 5.0 m s hold time, sda to scl t hd;sta 4.0 m s set-up time, scl to sda t su;sta 4.0 m s hold time, scl to sda t hd;dat 5.0 m s set-up time, sda to scl t su;dat 250 ns scl width high t high 4.0 m s scl width low t low 4.7 m s scl rise time t r 1000 ns scl fall time t f 300 ns operating current (analog) i ana 10 ma operating current (digital) i dig 0.3 ma standby current (analog) i anasave 0.1 ma standby current (digital) i digsave 0.035 ma signal to noise ratio s/n 96 db frequency response f 20 20k hz total harmonic distortion thd f flin, spread=high, no clipping 0.025 % total harmonic distortion thd r rlin, q1=on, no clipping 0.025 %
ref: qs7785r1.doc qs7785 data sheet -- preliminary date: 06/11/99 rev: 1.00 qsound labs, inc. page 5 of 10 QS7785CF/qs7785pf qsound multi-speaker system device specifications - preliminary information serial interface: serial interface with 3 control pins (for qs7785pf) serial interface with i 2 c (for QS7785CF) i2c address is { { ad7-ad0 } } = { { 10110110 } }
ref: qs7785r1.doc qs7785 data sheet -- preliminary date: 06/11/99 rev: 1.00 qsound labs, inc. page 6 of 10 QS7785CF/qs7785pf qsound multi-speaker system device specifications - preliminary information operating mode: this chip can be set to desired operating mode by control pins for the parallel interface (p/s pin sets to 1) or control bits for the serial interface (p/s pin sets to 0). the control pins or bits configurations are shown in the following table. control pins/bits output signal byp mono sur spd frout/ flout srout/ slout 0 0 0 0 stereo qx - 0 0 0 1 stereo qx+ - 0 0 1 0 stereo qx stereo q1 0 0 1 1 stereo qx+ stereo q1 0 1 0 0 mono stereo qx - 0 1 0 1 mono stereo qx+ - 0 1 1 0 mono stereo qx mono stereo q1 0 1 1 1 mono stereo qx+ mono stereo q1 1 0 0 x stereo bypass - 1 0 1 x stereo bypass stereo bypass 1 1 0 x - stereo bypass 1 1 1 x stereo bypass stereo q1 control pins/bits output signal byp mono sur spd cnt cout x x x x 0 - x x x x 1 ( rin+lin)/2 control pins/bits output signal byp mono sur spd cnt bass frout/ flout srout/ slout cout x x x x x 0 bass boost off bass boost off bass boost off x x x x x 1 bass boost on bass boost on bass boost on control pins/bits output signal byp mono sur spd cnt bass mute psave frout/ flout srout/ slout cout x x x x x x 0 0 available available available x x x x x x 1 0 - - - x x x x x x x 1 - - - note-1 ?_? indicates no output. note-2 qx+ has higher expansion than qx. note-3 psave = 1 disables chip. please refer to the electrical specification for its power consumption.
ref: qs7785r1.doc qs7785 data sheet -- preliminary date: 06/11/99 rev: 1.00 qsound labs, inc. page 7 of 10 QS7785CF/qs7785pf qsound multi-speaker system device specifications - preliminary information application (qs7785pf):
ref: qs7785r1.doc qs7785 data sheet -- preliminary date: 06/11/99 rev: 1.00 qsound labs, inc. page 8 of 10 QS7785CF/qs7785pf qsound multi-speaker system device specifications - preliminary information application (QS7785CF):
ref: qs7785r1.doc qs7785 data sheet -- preliminary date: 06/11/99 rev: 1.00 qsound labs, inc. page 9 of 10 QS7785CF/qs7785pf qsound multi-speaker system device specifications - preliminary information speaker configuration: the qs7785 allows the following speaker position. center control: the output level of this device is optimized for the speaker layout type-a, two front speakers in front and two rear speakers in rear, shown above. in case of type-b, having four speakers in front, the surround may sound too rich or the center may sound too thin. in such case, either mixing an auxiliary center output, cout, to two front speakers, type-d, or driving a center speaker from the cout, type- c, can enhance the center. it may be good idea to filter only voice band of the center signal to enhance a dialog of movies etc. the cout becomes available by setting ac control to high.
ref: qs7785r1.doc qs7785 data sheet -- preliminary date: 06/11/99 rev: 1.00 qsound labs, inc. page 10 of 10 QS7785CF/qs7785pf qsound multi-speaker system device specifications - preliminary information bass boost: the signal input of basinr and basinl can be used for a bass boosting as shown below. when the bas control pin is set to h, a low pass filter, consisting of ra, rb and c in the figure below, is connected to the input buffer in parallel to r1.
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