U2535B
Preamplifier for IR Remote Control
Description
The IC U2535B is a complete IR receiver for data com-
munication. The PIN photodiode converts the transmitted
IR telegram into electronic input signals. This is sepa-
rated by a special input circuit. The characteristics (filter,
gain) of the following amplifier are determined by exter-
nal components. The signal detector, consisting of a
comparator, an integrator and a Schmitt trigger, forms the
input signal to an output pulse that can be interfaced to a
microcomputer.
Features
D
Low current requirement (typical 260
m
A/ 12 V)
D
Carrier frequencies 20 to 100 kHz
D
Supply voltages:
5 or 7 to 16 V with internal stabilization
Applications
D
Keyless entry
D
Remote control
D
Wireless data transfer
D
Filter characteristics and gain are specified by few
external components
D
Demodulator with Schmitt trigger
D
Open collector output
Ordering Information
Extended Type Number
U2535B-FP
Package
SO8
Remarks
Block Diagram
95 9958
5
V
S
Supply voltage
for PIN diode
7
IN
8
–
+
+V
CC
+
–
4
+
–
Integrator
O
SW
V
S1
1 k
W
10
m
F
+V
10
m
F
6
GND
A1
C
1
1
R
1
2
A0
C
2
3
C3
C
3
R
2
Figure 1. Block diagram
Rev. A2, 15-Oct-98
1 (6)
TEMIC [ TEMIC SEMICONDUCTORS ]
