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T2525N233 Datasheet(PDF) 1 Page - ATMEL Corporation |
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T2525N233 Datasheet(HTML) 1 Page - ATMEL Corporation |
1 / 10 page Rev. 4657D–AUTO–11/03 Features • No External Components Except PIN Diode • Supply-voltage Range: 4.5 V to 5.5 V • Automatic Sensitivity Adaptation (AGC) • Automatic Strong Signal Adaptation (ATC) • Enhanced Immunity Against Ambient Light Disturbances • Available for Carrier Frequencies between 30 kHz to 76 kHz; Adjusted by Zener Diode Fusing • TTL and CMOS Compatible • Suitable Minimum Burst Length ³ 6 or 10 Pulses/Burst Applications • Audio Video Applications • Home Appliances • Remote Control Equipment Description The IC T2525 is a complete IR receiver for data communication developed and opti- mized for use in carrier-frequency-modulated transmission applications. Its function can be described using the block diagram (see Figure 1). The input stage meets two main functions. First, it provides a suitable bias voltage for the PIN diode. Secondly, the pulsed photo-current signals are transformed into a voltage by a special circuit which is optimized for low-noise applications. After amplification by a Controlled Gain Amplifier (CGA), the signals have to pass a tuned integrated narrow bandpass filter with a center frequency f 0 which is equivalent to the chosen carrier frequency of the input signal. The demodulator is used to convert the input burst signal into a digital envelope output pulse and to evaluate the signal information quality, i.e., unwanted pulses will be suppressed at the output pin. All this is done by means of an integrated dynamic feedback circuit which varies the gain as a function of the present environ- mental condition (ambient light, modulated lamps etc.). Other special features are used to adapt to the current application to secure best transmission quality. The T2525 operates in a supply-voltage range of 4.5 V to 5.5 V. Figure 1. Block Diagram Input Micro- controller CGA and filter Demodulator Oscillator AGC/ATC and digital control VS Modulated IR signal min 6/10 pulses GND IN OUT Carrier frequency f 0 IR Receiver ASSP T2525 |
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