ref: 2011v011.doc preliminary revision: 0.11 date: 97.03.26 page 1 of 6 note: the device data in these specifications are based on engineering samples, and are preliminary. QX2011 specifications are subject to change without notice. device specifications - preliminary information QX2011 qxpander processor general description the qxpander ? QX2011 is a bipolar analog stereo enhancement processor. this device is part of the qx chip family offered by qsound labs, and uses the patented qxpander ? technology to produce a spatially widened stereo image from ordinary left and right channel inputs. this audio enhancement is achieved while using normal stereo signals and standard stereo audio equipment. no special initial encoding of the input signals is required, no additional speakers are required, and no special hardware is needed to produce qxpanded audio. the 2011 has a ttl-compatible bypass control to select between qxpander enhancement and normal stereo audio. an analog spread control is provided to vary the amount of qxpander enhancement. the QX2011 is fabricated in bipolar technology, and is offered in plastic 22 pin sdip and 24 pin ssop packages. features produce a wide sound image from normal stereo input. no encoding of input signals, no special equipment required to qxpand audio. ttl-compatible enhancement/bypass control. user adjustable enhancement level. low noise: 60 uv rms . single supply voltage, internal reference. few external components, low cost. applications television sound systems (stereo). semi-professional audio equipment. personal/portable audio. multimedia applications for pcs and laptops. multimedia speaker systems. video games. pin assignment rin vref fb1 fb2 fb3 fb4 fb5 fb6 fb7 fb8 gnd rout lout fa6 fa5 fa4 fa3 fa2 fa1 byp lin vcc 16 15 14 13 17 18 19 20 21 22 12 7 8 9 10 6 5 4 3 2 1 11 figure 1: sdip-22 pin assignment rout lout fa6 fa5 fa4 fa3 fa2 fa1 byp lin vcc nc2 16 15 14 13 17 18 19 20 21 22 24 23 12 7 8 9 10 6 5 4 3 2 1 11 rin vref fb1 fb2 fb3 fb4 fb5 fb6 fb7 fb8 gnd nc1 figure 2: ssop-24 pin assignment
QX2011 qxpander processor device specifications qsound labs preliminary revision: 0.11 date: 97.03.26 page 2 of 6 note: the device data in these specifications are based on engineering samples, and are preliminary. QX2011 specifications are subject to change without notice. principles of operation. in ordinary stereo systems, the stereo image is formed between the left and right speakers, and is confined by the speaker positions (i.e., the "sound stage" is located between the two speakers). the qxpander ? is designed to form the stereo image beyond the speakers, thus enlarging the "sound stage". if the center channel is defined as the monaural or common component of the left and right channels, then figure 3 shows the spatial response of the qxpander ? when operating, and for normal stereo bypass. figure 3: qxpander ? spatial response the amount of qxpander ? enhancement can be controlled with the fb7 and fb8 control pins. the spread control allows continuous variable adjustment from maximum qxpander enhancement down to normal stereo signal (bypass). a potentiometer or a voltage divider/decoder pair (for digital systems) is used to set the enhancement (see figure 5 ). r vref,fb8 r fb7,fb8 qxpander 0 w - minimum - bypass - 0 w maximum table 1: mode selection for simple qx/bypass selection, the byp control input is ttl-compatible and can be directly driven by logic. v byp mode 0 v bypass - normal stereo 3 2.1 qxpander enhanced table 2: mode selection normally, the qxpander ? is used in the preamplifier stage between the stereo source and the amplifier stages used to drive the speakers. figure 4 shows the functional elements of the QX2011. spatial enhancement stereo in l r l r stereo out stereo switch byp pre amp power amp figure 4: qxpander ? simplified block diagram qsound applications engineers can assist customers in integrating the QX2011 into their application designs.
QX2011 qxpander processor device specifications qsound labs preliminary revision: 0.11 date: 97.03.26 page 3 of 6 note: the device data in these specifications are based on engineering samples, and are preliminary. QX2011 specifications are subject to change without notice. 1 2 34 a b c d 4 3 2 1 d c b a rchout lchout & x) + & x) + & x) 5 . & x) 5 . 3 2 5 6 4 1 8 7 8$ /0 3 2 5 6 4 1 8 7 8$ /0 & x) & x) + & x) 5 5 5 vcc vcc + & x) + & x) + & x) + - 63.5 2+0 + - 63./ 2+0 1 vref 2 fb1 3 fb2 4 fb3 5 fb4 6 fb5 7 fb6 8 fb7 9 fb8 10 gnd 11 12 13 fa6 14 fa5 15 fa4 16 fa3 17 fa2 18 fa1 19 byp 20 21 vcc 22 virtual audio qxpander processor lin rin lout rout 5 n 5 n 5 n 5 n 5 n 5 n 5 n 5 n 5 n & x & x & x & x) & x 6: + & x) + & x) + & x) + & x) 4;sdqghuohyho lin rin vcc 127(6 5hvlvwru7rohudqfh &dsdflwru7rohudqfh %<3 6whuhr%\sdvv%<3 4;sdqghg$xglr%<3 8 4; 4;3$1'(5352&(6625 4; n 0$; 0,1 6',3 & x) n n volume control figure 5: QX2011 qxpander ? typical application
QX2011 qxpander processor device specifications qsound labs preliminary revision: 0.11 date: 97.03.26 page 4 of 6 note: the device data in these specifications are based on engineering samples, and are preliminary. QX2011 specifications are subject to change without notice. absolute maximum ratings * t a = +25 c parameter symbol rating unit supply voltage v cc,max 15 v input voltage v in,max gnd v in v cc v output current i o,max 10 ma power dissipation, p22 p d 800 mw power dissipation, s24 p d 650 mw operating temperature t opr -20 ~ +75 c storage temperature t stg -40 ~ +125 c warning: operation of the device at or beyond these limits may result in permanent damage to the device. normal operation is not guaranteed at these extremes. recommended operating conditions parameter symbol rating unit supply voltage v cc,op 4.5 ~ 12.0 v operating temperature t opr -20 ~ +75 c analog characteristics : (v cc = 9v, t a = +25 c, v byp = 5v, lin=rin=0v rms, unless otherwise specified.) parameter tc sym min typ max unit supply current i cc 16 21 ma input impedance r i 21 30 39 k w input voltage, analog,1 1 v in,1 1.0 1.4 v rms input voltage, analog,2 2 v in,2 0.5 0.7 v rms voltage gain, qxpander,1 3 g qx,1 34 5db voltage gain, qxpander,2 4 g qx,2 -1 0.5 2 db voltage gain, qxpander,3 5 g qx,3 34 5db voltage gain, qxpander,4 6 g qx,4 -1 0.5 2 db voltage gain, bypass,1 7 g by,1 -5.6 -5.1 -4.6 db voltage gain, bypass,2 8 g by,2 -5.6 -5.1 -4.6 db total harmonic distortion, qxpander 9 thd qx 0.4 1.0 % total harmonic distortion, bypass 10 thd by 0.03 0.3 % output noise voltage, qxpander 11 v no,qx 60 100 m v rms
QX2011 qxpander processor device specifications qsound labs preliminary revision: 0.11 date: 97.03.26 page 5 of 6 note: the device data in these specifications are based on engineering samples, and are preliminary. QX2011 specifications are subject to change without notice. output noise voltage, bypass 12 v no,by 15 32 m v rms signal-noise ratio, qxpander snr tbd tbd db signal-noise ratio, bypass snr tbd tbd db channel balance 13 cb -1.0 0 +1.0 db byp terminal voltage, h 14 v by,h 2.1 v byp terminal voltage, l 15 v by,l 0.7 v byp terminal current, h 16 i by,h 350 m a byp terminal current, l 17 i by,l -10 m a insertion loss tbd db power supply rejection ratio psrr tbd tbd db output voltage, analog v out tbd tbd v rms output current, analog i out tbd ma load resistance r l tbd k w load capacitance c l tbd pf usable bandwidth bw 20 20000 hz test conditions: 1. f=1khz, lin and rin 0 phase difference, and output voltage t.h.d. no greater than 1%. 2. f=1khz, lin and rin 180 phase difference, and output voltage t.h.d. no greater than 1%. 3. lin=1 v rms , 1 khz, rin=0 v, at lout. 4. lin=1 v rms , 1 khz, rin=0 v, at rout. 5. lin=0 v, rin=1 v rms , 1 khz, at rout. 6. lin=0 v, rin=1 v rms , 1 khz, at lout. 7. lin=1 v rms , 1 khz, rin=0 v, v byp =0v, at lout. 8. lin=0 v, rin=1 v rms , 1 khz, v byp =0v, at rout. 9. total harmonic distortion (thd) at lout and rout (qxpander active): a) lin = 1 v rms , rin = 0 v. b) lin = 0 v, rin = 1 v rms . 10. test condition 8, v byp = 0v (bypass) 11. bw = 20 ~ 20000 hz, lin = rin = 0 v, a curve, qxpander active: at lout and rout. 12. bw = 20 ~ 20000 hz, lin = rin = 0 v, a curve, v byp = 0 v (bypass): at lout and rout. 13. lin = rin = 1 v rms , 1 khz, v byp = 0 v (bypass), rout - lout (r - l). 14. high-level input voltage of byp terminal, qxpander mode, maximum spread 15. low-level input voltage of byp terminal, bypass mode, no spread (normal stereo). 16. input current of byp terminal, v byp =5v 17. input current of byp terminal, v byp =0v
QX2011 qxpander processor device specifications qsound labs preliminary revision: 0.11 date: 97.03.26 page 6 of 6 note: the device data in these specifications are based on engineering samples, and are preliminary. QX2011 specifications are subject to change without notice. package data ordering code package code package type QX2011-p22c p22 plastic sdip QX2011-s24c s24 plastic ssop plastic sdip 22 lead 300 mil 0.070 pitch units: mm p22 80 . 015 ~ 025 005 01 . . . - + 65 02 .. 1778 . 19 2 0 5 .. 001 .42 . 105 01 03 . . . - + 121 . 30 . 68 05 .. 35 03 .. 0 735 01 03 . . . - + 05 02 .. 015 015 01 . . . - + 010 ~ s24 plastic ssop 24 lead 300 mil 0.030 pitch units: mm 18 . 005 005 .. 185 015 .. 036 01 .. 08 . 10 2 0 3 .. 502 .4 . 78 03 .. 10 . 112 13 24
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