U2538B

• Few External Components
• Low Power Consumption
• Microcomputer Compatible
• Insensitive to Ambient Light and Other Continuous Interferences

• Keyless Entry Systems
• Remote Control
• Wireless Data Transfer up to 4 kbit/s

The IC U2538B is a complete IR receiver for data communication. The useful input signals are separated by a special input circuit and amplified by a gain-controlled amplifier. The bandpass filter suppresses the off-band signals. The signal detector, consisting of a demodulator, an integrator and a Schmitt trigger, forms the input signal to an output pulse that can be interfaced to a microcomputer. The AGC and the ATC circuit control the receiver's sensitivity, making it insensitive to ambient light sources.