dynameq ? ii wdrc ic features ? dual channel signal processing ? 2nd (4th) order state variable filter ? adjustable crossover frequency ? adjustable compression ratio from 1:1 to 4:1 ? independent compression ratio adjustment for low and high frequency band ? adjustable agc threshold levels ? unique twin average detectors ? handles high input levels ? low thd and imd distortion ? drives class d integrated receivers ? mpo range externally adjustable packaging ? chip au bump device description the dynameq ? ii product family is a second generation wide dynamic range compression (wdrc) system. GB570 (gc570) incorporates 12 db/oct (24 db/oct) filtering and is designed to accommodate cic and itc size requirements. the gain and frequency response is dependant on the users environment. twin averaging detector circuits are optimized for sound quality during normal listening without sacrificing comfort during sudden loud inputs. all input signals to dynameq ? ii, are processed by 2:1 compression before subsequent band splitting. the 12 db/oct (24 db/oct) band split filter ahead of the expander/compressor circuits allows for independent compression ratio adjustment (1:1 to 4:1) in high and low frequency channels. the gain setting stage is followed by a class d integrated receiver preamplifier stage. symmetrical peak clipping is used to achieve mpo adjustment.
GB570/gc570 - data sheet functional block diagram all resistors in ohms, all capacitors in microfarads, unless otherwise stated document no. 521 - 99 - 00 gennum corporation p.o. box 489, stn. a, burlington, ontario, canada l7r 3y3 tel. +1 (905) 632-2996 web site: www.gennum.com e-mail: hipinfo@gennum.com out mpo in gnd b out b in reg in a out f out r ? v reg r th v b c sad c fad 4:1 2:1 1:1 r hi r lo 1 2 5 4 3 6 7 8 9 12 11 10 13 14 15 16 19 18 17 20 slow
average
detector fast
average
detector control 10k
rectifier r agc_in v b 50k regulator GB570
gc570 48k 48k 8k4 1m 85k6 42k8 1m 14k 12k 1 x - b - a - c 12 db / oct
(24 db / oct)
band split
filter high frequency
expander / compressor low frequency
expander / compressor r h r l
2 521 - 99 - 00 parameter symbol conditions min typ max units ic current i amp - 370 530 m a minimum voltage vb 1.1 - - v total harmonic distortion thd v in = -40dbv at 1khz - 0.2 1.0 % thd with maximum allowable input thd m v in = -23dbv, rvc = 47k w -210% input referred noise irn aweight - 3.0 - m v rms total system gain a v v in = -90dbv 46 49 52 db regulator voltage v reg i load = 30 m a 890 930 1000 mv agc lower threshold th lo -91 -87 -83 dbv upper threshold th hi -36 -32 -28 dbv compression gain range d a gain(-90dbv in ) -gain(-30dbv in ) 37.5 40.5 43.5 db system gain in compression a 60 v in =-60dbv 26 29 32 db min. compression ratio cmp 1 :1 v in =3khz, -60dbv to -40dbv, rhp=1:1 rlp=1:1 0.9 1.0 1.1 ratio max. comp. ratio cmp 4 :1 v in =3khz, -60dbv to -40dbv, rhp=4:1, rlp=4:1 3.6 4.0 4.3 ratio fast detector time constant t fast -10-ms slow detector time constant t slow - 220 - ms filter maximum cross-over frequency ? c_0 r ?c =0 w 3.0 3.9 - khz nominal cross-over frequency ? c_22 r ?c =22k w 1.5 1.9 2.3 khz minimum cross-over frequency ? c_220 r ?c =220k w - 0.9 1.4 khz filter rolloff rate (GB570) - 12 - db/oct (gc570) - 24 - db/oct stage a and b --- open loop gain (b) a ol_b -52-db input impedance (a) r in 81112 k w output stage stage gain a c v in =-30dbv 7 9 11 db max output level mpo r vc =220k w ,v in =-25dbv -14.5 -12.5 -10.5 dbv mpo range d mpo r mpo =0 w to 50k w 13 15 17 db output resistance r out -24-k w caution class 1 esd sensitivity absolute maximum ratings parameter value / units supply voltage 3 vdc power dissipation 25 mw operating temperature range -10 c to 40 c storage temperature range -20 c to 70 c pad connection conditions: supply voltage v b = 1.3 v, frequency = 1 khz, temperature = 25 c electrical characteristics all conditions and parameters remain as shown in test circuit unless otherwise stated in "conditions" column. r hi v b r ec r lo 4:1 1:1 c fad c sad b out b in r ? a out f out out v reg in gnd 2:1 mpo r th 2 3 4 5 6 7 8
9
10
1 11
12 17 16 15 14 13 18
19 20
3 521 - 99 - 00 3.9k
v in 0 2
0 22
0 1 r vc =100k
0 22
r mpo =0
r th =
= 22k
2 2
50k v b r ?
10n 0 1
1 2 5 4 3 6 7 8 9 12 11 10 13 14 15 16 19 18 17 20 slow
average
detector fast
average
detector control 10k
rectifier r agc_in v b 50k regulator GB570
gc570 48k 48k 8k4 1m 1m 14k 12k 1 x - b - a - c 12 db / oct
(24 db / oct)
band split
filter high frequency
expander / compressor low frequency
expander / compressor r h r l 85k6 42k8 fig. 1 production test circuit all resistors in ohms, all capacitors in microfarads, unless otherwise stated fig. 2 maximum flexibility hearing instrument application all resistors in ohms, all capacitors in microfarads, unless otherwise stated
200k linear
200k linear
r hi r lo r mpo
50k
log 2 2
any
knowles
class d
receiver v b 0 22
r vc
100k log any knowles
or
microtronics
microphone 0 22
r th
100k
log
r ?
100k log v b slow
average
detector fast
average
detector control 10k
rectifier r agc_in v b 50k regulator GB570
gc570 48k 48k 8k4 1m 1m 14k 12k 1 x - b - a - c 12 db / oct
(24 db / oct)
band split
filter high frequency
expander / compressor low frequency
expander / compressor r h r l 0 1 10n
0 2
0 1
0 1
1 2 5 4 3 6 7 8 9 12 11 10 13 14 15 16 19 18 17 20 85k6 42k8
4 521 - 99 - 00 r mpo =0
0 1
50k 0 22
r vc =100k
r ? =22k
0 1
r hi1 =200k
r hi2 =0 r lo2 =0 0 22
r th =
r lo1 =200k v b =1.3v 3.9k
2 2
10n
0 2
pink noise
generator
or
1khz for i/o slow
average
detector fast
average
detector control 10k
rectifier r agc_in v b 50k regulator GB570
gc570 48k 48k 8k4 1m 1m 14k 12k 1 x - b - a - c 12 db / oct
(24 db / oct)
band split
filter high frequency
expander / compressor low frequency
expander / compressor r h r l 1 2 5 4 3 6 7 8 9 12 11 10 13 14 15 16 19 18 17 20 85k6 42k8 fig. 3 minimum component hearing instrument application all resistors in ohms, all capacitors in microfarads, unless otherwise stated fig. 4 characterization circuit (used to generate typical curves) all resistors in ohms, all capacitors in microfarads, unless otherwise stated 0 1
0 22
10n 0 22
r vc
100k log any knowles
or
microtronics
microphone any
knowles
class d
receiver
v b v b slow
average
detector fast
average
detector control 10k
rectifier r agc_in v b 50k regulator GB570
gc570 48k 48k 8k4 1m 1m 14k 12k 1 x - b - a - c 12 db / oct
(24 db / oct)
band split
filter high frequency
expander / compressor low frequency
expander / compressor r h r l 0 1
0 2
1 2 5 4 3 6 7 8 9 12 11 10 13 14 15 16 19 18 17 20 85k6 42k8 0 1
5 521 - 99 - 00 0 2 3 4 5 6 7 8 9 0 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.0 typical performance curves output level (dbv) 1.2:1 1:1 1.5:1 4:1 3:1 2:1 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 -90 - 80 -70 -60 -50 -40 -30 -20 input level (dbv) fig. 5 i/o transfer function for different compression ratios 50 40 30 20 10 0 -10 gain (db) v in = -40dbv v in = -20dbv v in = -60dbv v in = -80dbv v in = -96dbv 20 100 1k 10k 20k frequency (hz) fig. 6 frequency response for different input levels 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6 3.8 4.0 compression ratio (ratio) fig. 7 compression settings resistor ratio for high pass channel (r hi1 & r hi2 ) and low pass channel (r lo1 & r lo2 ) 50 40 30 20 10 0 -10 gain (db) 20 100 1k 10k 20k frequency (hz) fig. 8 frequency response for different r vc values v in = -60dbv r vc = 220k w r vc = 100k w r vc = 47k w r vc = 22k w r vc = 10k w r lo1 r lo1 +r lo2 r hi1 r hi1 +r hi2 ( ) -10 -20 -30 -40 -50 -50 -40 -30 -20 input level (dbv) fig. 9 i/o transfer function for different r mpo resistors compression 1:1 output level (dbv) r m po = 0 w r m po = 10k w r m po = 22k w r m po = 50k w output level (dbv) r th = r th = 0 w r th = 10k w r th = 22k w r th = 100k w r th = 47k w -10 -20 -30 -40 -50 -60 -70 -100 -90 -80 -70 -60 -50 -40 30 -20 input level (dbv) fig. 10 i/o transfer function for different r th resistors
6 521 - 99 - 00 50 40 30 20 10 0 -10 gain (db) 20 100 1k 10k 20k frequency (hz) fig. 13 crossover frequency representation for GB570 processor r ?c = 1:1 in low frequency 4:1 in high frequency 4:1 in low frequency 1:1 in high frequency v in = -80dbv 50 40 30 20 10 0 -10 gain (db) 20 100 1k 10k 20k frequency (hz) fig. 14 crossover frequency representation for ggc570 processor r ?c = v in = -80dbv 1:1 in low frequency 4:1 in high frequency 4:1 in low frequency 1:1 in high frequency 50 40 30 20 10 0 -10 gain (db) 20 100 1k 10k 20k frequency (hz) fig. 15 GB570 frequency response for different r ?c resistor values 100k w 47k w 22k w 10k w 0 w 50 40 30 20 10 0 -10 gain (db) 20 100 1k 10k 20k frequency (hz) fig. 16 gc570 frequency response for different r ?c resistor values v in = -80dbv 100k w 47k w 22k w 10k w v in = -80dbv 1000 100 10 1 r ag_c resistor value (k w ) 198k w 9k w r h & r l resistors values (k w ) -100 -90 -80 -70 -60 -50 -40 30 -20 input level (dbv) fig. 11 stage a compressor feedback resistor value -100 -90 -80 -70 -60 -50 -40 30 -20 input level (dbv) fig. 12 expander / compressor resistors values 1.6m w 72k w 15k w 1:1 4:1 10000 1000 100 10 2:1 crossover frequency crossover frequency 1:1 in low frequency gain 4:1 in high frequency r ?c = 1:1 in low frequency gain 4:1 in high frequency r ?c = 0 w
7 521 - 99 - 00 100 1000 10000 frequency (hz) fig. 17 thd and noise vs frequency 10 1 0.1 thd & noise (%) GB570 gc570 -80 -70 -60 -50 -40 -30 -20 input level (dbv) fig. 18 thd and noise vs input level thd & noise (%) GB570 10 1 0.1 gc570 3000 10000 100000 frequency (hz) fig. 19 intermodulation distortion (ccif) vs frequency 10 1 0.1 imd (%) gc570 GB570 v in = -40dbv d ? = 200hz -80 -70 -60 -50 -40 -30 -20 input level (dbv) fig. 20 intermodulation distortion (ccif) vs input level imd (%) ? = 4khz d ? = 200hz GB570 gc570 10 1 0.1 0.01 v in = -40dbv ?= 1 khz document identification: data sheet the product is in production. gennum reserves the right to make changes at any time to improve reliability, function or design, in order to provide the best product possible. gennum corporation assumes no responsibility for the use of any circuits described herein and makes no representations that they are free from patent infringement. ? copyright september 1998 gennum corporation. all rights reserved. printed in canada. revision notes: new document. gennum corporation mailing address: p.o. box 489, stn. a, burlington, ontario, canada l7r 3y3 tel. +1 (905) 632-2996 fax +1 (905) 632-2814 shipping address: 970 fraser drive, burlington, ontario, canada l7l 5p5 gennum japan corporation c-101, miyamae village, 2-10-42 miyamae, suginami-ku, tokyo 168-0081, japan tel. +81 (3) 3334-7700 fax: +81 (3) 3247-8839
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