iC-WT
INCREMENTAL ENCODER
FEATURES
♦
Differential scanning for track A and B
♦
Constant-light-evaluated scanning for the index track Z with
adjustable relative threshold
♦
Photocurrent amplifier with high cut-off frequency
♦
Current comparators with hysteresis
♦
Index track Z selectable gated by tracks A and B
♦
Current-limited and short-circuit-proof push-pull outputs
♦
Outputs TTL compatible
♦
Adjustable LED current control for constant optical receiver
power
♦
Integrated 50mA driver for the transmit LED
♦
LED current monitoring and error message upon violating
the control range
♦
Low current consumption from single 5V power supply
◊
Option: enhanced temperature range -40..125°C
APPLICATIONS
♦
Photocurrent evaluation for
incremental linear or angular
position measuring systems
PACKAGES
SO16N
BLOCK DIAGRAM
+5V
2
VCC
14
PHOTODIODES ARRAY
CODEWHEEL
DPA
A
3
OUT_A
15
DPA
DNA
12
DNA
TRACK A
+5V
DPB
B
4
OUT_B
LED
DPB
DNB
13
DNB
TRACK B
iC-WT
11
DZ
DZ
Z
5
OUT_Z
iC-OR
8
10
9
16
CLR
10nF
RLR
15kΩ
RZ
15kΩ
CLR
ILR
ERROR
TRACK Z
NERR
LED
6
ERROR
IZ
AGND
LED CURRENT CONTROL
DRIVER
LED
7
GND
1
RLED
68Ω
©1997
iC-Haus GmbH
Integrated Circuits
Am Kuemmerling 18, D-55294 Bodenheim
Rev A0
Tel +49-6135-9292-0
Fax +49-6135-9292-192
http://www.ichaus.com
ICHAUS [ IC-HAUS GMBH ]
