ATA2525 데이터 시트보기 (PDF) - Atmel Corporation

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ATA2525

IR Receiver ASSP

Atmel Corporation 

1. Description

The Atmel® IC ATA2525 is a complete IR receiver for data communication that was developed and optimized for use in

carrier-frequency-modulated transmission applications. The IC combines small size with high sensitivity as well as high

suppression of noise from daylight and lamps. An innovative and patented pad layout offers unique flexibility for assembly of

IR receiver modules. The Atmel ATA2525 is available with standard carrier frequencies (33, 36, 37, 38, 40kHz) and 3

different noise suppression regulation types (standard, lamp, noise) covering requirements of different high-volume remote

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

supply voltage range of 4.5V to 5.5V.

The function of Atmel ATA2525 can be described using the block diagram (see Figure 1-1 on page 2). 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 f0

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 environmental condition (ambient light, modulated lamps etc.). Other special features are used to

adapt to the current application to secure 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 10 Pulses

Oscillator

AGC/ATC and Digital Control

GND

ATA2525

2

ATA2525 [DATASHEET]

4854H–AUTO–03/14

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