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
V
I
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
PDF 
ZIP