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U2538B_05

器件名称: U2538B_05
功能描述: IR Receiver for Data Communication
文件大小: 201.78KB    共9页
生产厂商: ATMEL
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简  介:Features Few External Components Low Power Consumption Microcomputer Compatible Insensitive to Ambient Light and Other Continuous Interferences Applications Keyless Entry Systems Remote Control Wireless Data Transfer up to 4 kbit/s IR Receiver for Data Communication U2538B 1. Description 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. Figure 1-1. Block Diagram with Typical Circuit VS U2538B Input Amplifier and filter Detector C AGC/ATC Modulated IR signal carrier frequency 20 to 60 kHz minimum 6 pulses/burst Rev. 4717B–IRRC–09/05 Figure 1-2. Block Diagram VS RF0 RF VS BIAS IN BPF + - Comp 1 100 k OUT & dt Vth + - Comp 2 INT ST TIA CGA AGC ATC DEM AGND CAGC CAGC DGND TIA CGA BPF AGC Transimpedance amplifier Controlled gain amplifier Bandpass filter Automatic gain control ATC DEM INT ST Automatic threshold control Demodulator Integrator Schmitt trigger 2 U2538B 4717B–IRRC–09/05 U2538B 2. Pin Configuration Figure 2-1. Pinning SO8 NC 8 RF 7 AGND 6 IN 5 U2538B 1 VS 2 CAGC 3 OUT 4……
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器件名 功能描述 生产厂商
U2538B_05 IR Receiver for Data Communication ATMEL
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