1、Features
The IC having a plurality of series of bandpass frequency BMP alternative, GP1UM261RK typical bandpass frequency 38KHz, and the like inside the preamplifier amplifier circuit are frequency 38KHz.
Compact compact, small size
2、internal block diagram
3, the working principle
First by a photodiode converts the optical signal into an electric signal, fed to a preamplifier circuit to amplify, the amplifier is a resonant amplifier, the resonant frequency of 38KHz, the carrier signal after the capacitive coupling to the limiter amplified, after clipping peak detection, and then the demodulated coded signal desired, and then shaping and amplifying the waveform output from the output pin.
4、footdescription
1------------------Vout
2------------------Vcc
3------------------GND
4, a peripheral circuit
L11 and C11 form an LC low-pass filter, to improve the sensitivity and performance, the remote control receiver.
R11 is a pull-up resistor to improve the load capacity and the output pin with anti-jamming capability.
R12 and C12 form an RC filter filtering out the interfering signal in the output signal.