etic reserves the right to make changes at any time to improve the design and to supply the best product. ? 2000, rev a1 ic-haus gmbh tel +49-6135-9292-0 integrated circuits fax +49-6135-9292-192 am kuemmerling 18, d-55294 bodenheim http://www.ichaus.com page 1 of 2 features supply voltage range 4.5v to 30v operation to 1mhz designed for photodiode inputs index gated by a and b channels current sink for led drive (see application note app-d2 ) outputs short circuit protected 25ma peak drive current comparator hysteresis only 1.1 : 1 3 channel differential amplifier-comparator (lower hysteresis version of standard et9570) ET9570LH description these devices are specifically designed as receiver circuits for the photodiode signals available in optical encoders. connect the anode of the photodiodes to the input pins, with the cathode(s) connected to vcc for reverse-bias operation. the input amplifiers have a dynamic range of nearly 1000:1, and allow contrast ratios of encoded signal to common mode signal of as low as 2:1. differential inputs enhance noise rejection and performance over temperature. gating of the z channel provides synchronization of the reference pulse to the data channel phasing. hysteresis ratio of comparators is 1.1:1, instead of the 1.25:1 on the standard device. applications high speed optical encoders industrial controls absolute maximum ratings parameter symbol min. max. units ref. operating temperature range t a -40 125 c note 1 supply voltage range v cc 4.5 30 v
etic reserves the right to make changes at any time to improve the design and to supply the best product. ? 2000, rev a1 ic-haus gmbh tel +49-6135-9292-0 integrated circuits fax +49-6135-9292-192 am kuemmerling 18, d-55294 bodenheim http://www.ichaus.com page 2 of 2 electrical characteristics unless otherwise specified, typical values given at v cc =12v, t a = 25c, with led and rset open. parameters symbol min. typ. max. units test conditions supply current icc1 icc2 4.5 5.0 7.2 8.0 11.5 12.5 ma vcc = 4.5 v vcc = 30.0v input common mode voltage v cm 1.35 v average photocurrent input i ia 0.066 0.3 40 a each input peak photocurrent input i ip 0.13 0.5 60 a each input dark cell level i id 0.02 0.1 20 a each input photocurrent contrast ratio i ir 2:1 5:1 peak:dark cell comparator threshold 1.1:1 ratio of differential inputs output high level voltage v oh 2.5 28.0 3.0 28.5 vi oh = -4ma,v cc = 4.5v i oh = -4ma,v cc = 30v output low level voltage v ol 199 400 mv v cc = 4.5v-30v i ol = 8ma output short-circuit current driving high (all outputs) i os 15 25 50 ma v cc = 5v, v out = 0v output short-circuit current driving low (all outputs) i os 30 70 120 ma v cc = 5v, v out = 5v rset voltage v rset 1.3 1.7 2.1 v r = 180 ohms ac switching characteristics values given at v cc = 5v, t a = 25c, c l = 15pf on all outputs. parameters symbol min. typ. max units test conditions pre-amplifier bandwidth bw pa 900 khz photocurrent = 1a minimum propagation delay from comparator input to output t pd 850 ns output rise time t r 100 ns output fall time t f 20 ns notes: 1. this is not a test parameter, but for information only. package suffix chip only -c 16 lead soic -sop
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