iC-WG
14-BIT DIFFERENTIAL SCANNING OPTO ENCODER
FEATURES
♦
Excellent matching and reliability due to monolithic
construction with integrated photodiodes
♦
Short track pitch (600µm)
♦
Elimination of dark currents due to differential scanning
♦
Photocurrent amplifier with high cut-off frequency
♦
Current comparators with acurately tracked hysteresis
♦
Current-limited push-pull outputs
♦
Adjustable LED current control for constant receive power
♦
Integrated power driver for the transmit LED
♦
LED current monitor with error message output
♦
Integrated test aid1
♦
Low power consumption
♦
Broad operating voltage range, from 4.5V to 20V
♦
Available as 28-pin BLCC or as chip
♦
Options: extended temperature range of -30..110°C,
customized packages, reticle assembly, code disc
APPLICATIONS
♦
Optical position decoding with
14-bit resolution based on the
principle of differential scanning
CHIP
2.97mm
×
8.71mm
BLOCK DIAGRAM
4.5..20V
C1
100nF
VCC
14
1
VCC
GND
DR
DSR (REF.)
AMPLIFIER
VCC
R2
50Ω
LED
+
-
8
LED
LGND
9
VCC
1.2V
7
R1
50kΩ
RSR
RGND
+
-
VCC
CSR
11
C2
100nF
5..25V
R3
10kΩ
ERROR
CONTROL
6
LED-CURRENT CONTROL
AMPLIFIER
-
+
-
+
NERR
10
VCC
P
N
MONITOR
TRACK POSITION
VCC
AMPLIFIER
COMPARATOR
PUSH-PULL
OUTPUT
IMP
IMN
n.c.
n.c.
28
3
2
A0
P
N
IP0
IN0
TRACK 0
P
N
(see TRACK 0)
TRACK 1
VCC
PUSH-PULL
OUTPUT
A1
IP1
IN1
27
5
4
AMPLIFIER
COMPARATOR
A2
26
P
N
TRACK 2
P
N
(see TRACK 2)
A3
..13
25..15
TRACK 3..13
VCC
AMPLIFIER
12
TIP
13
TIN
iC-WG
TEST
BIAS
1.2V
IM1
n.c.
BLCC WGC2
MONITOR
©1999
iC-Haus GmbH
Integrated Circuits
Am Kuemmerling 18, D-55294 Bodenheim
Rev B0
Tel +49-6135-9292-0
Fax +49-6135-9292-192
http://www.ichaus.com
ICHAUS [ IC-HAUS GMBH ]
