器件名称: U2535B
功能描述: Preamplifier for IR Remote Control
文件大小: 71.84KB 共6页
简 介:U2535B
Preamplifier for IR Remote Control
Description
The IC U2535B is a complete IR receiver for data communication. The PIN photodiode converts the transmitted IR telegram into electronic input signals. This is separated by a special input circuit. The characteristics (filter, gain) of the following amplifier are determined by external 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 mA/ 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 VS Supply voltage for PIN diode 7 IN 8 – + +VCC + – 4 + – Integrator OSW VS1
1 kW 10 mF +V
10 mF
6 GND A1 C1
1 R1
2 A0 C2
3 C3 C3
R2
Figure 1. Block diagram
Rev. A2, 15-Oct-98
1 (6)
U2535B
Pin Description
AI AO C3 OSW 1 8 Pin 1 IN Symbol Function AI Inverting input of bandpass amplifier, pin connection for external filter function AO Output of bandpass amplifier C3 Capacitor at Pin 3 to reject (suppress) ripple during transmission, also functions as delay time for reference voltage of the compara……
