ATA2526 データシートの表示（PDF） - Atmel Corporation

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ATA2526

Low-voltage IR Receiver ASSP

Atmel Corporation 

1. Description

The Atmel® IC ATA2526 is a complete IR receiver for data communication that has been developed and optimized for use in

carrier-frequency-modulated transmission applications. The IC combines small size with high sensitivity suppression of

noise as caused by daylight and lamps. An innovative and patented pad layout offers unique flexibility for IR receiver module

assembly. The Atmel ATA2526 is available with standard frequencies (33, 36, 37, 38, 40, 56kHz) and 3 different noise

suppression regulation types (standard, lamp, short burst), thus covering the requirements of different high-volume remote

control solutions (please refer to selection guide available for Atmel ATA2525/ATA2526). The Atmel ATA2526 operates in a

supply voltage range of 2.7V to 5.5V.

The function of the Atmel ATA2526 can be described using the block diagram of Figure 1-1. The input stage has 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 f0 which is

equivalent to the chosen carrier frequency of the input signal. The demodulator is used first to convert the input burst signal

to a digital envelope output pulse and to evaluate the signal information quality, i.e., unwanted pulses will be suppressed at

the output pin. This is done by means of an integrated dynamic feedback circuit which varies the gain as a function of the

present environmental conditions (ambient light, modulated lamps etc.). Other features can be used to adapt the device to

the individual application to ensure best transmission quality.

Figure 1-1. Block Diagram

VS

IN

Input

CGA and

Filter

Demodulator

OUT

Micro-

controller

Carrier Frequency f0

Modulated IR Signal

min 6 or 10 Pulses

Oscillator

AGC/ATC and Digital Control

GND

ATA2526

2

ATA2526 [DATASHEET]

4905G–AUTO–04/14

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