ATA2525R338-DDW(2006) Просмотр технического описания (PDF) - Atmel Corporation

Номер в каталоге

Компоненты Описание

Список матч

ATA2525R338-DDW
(Rev.:2006)

IR Receiver ASSP

Atmel Corporation 

Features

• No External Components Except PIN Diode

• Supply-voltage Range: 4.5V to 5.5V

• High Sensitivity Due to Automatic Sensitivity Adaption (AGC) and Automatic Strong

Signal Adaption (ATC)

• High Immunity Against Disturbances from Daylight and Lamps

• Small Size and Innovative Pad Layout

• Available for Carrier Frequencies between 33 kHz to 40 kHz; Adjusted

by Zener Diode Fusing

• TTL and CMOS Compatible

• Suitable Minimum Burst Length ≥ 10 Pulses/Burst

Applications

• Home Entertainment Applications

• Home Appliances

• Remote Control Equipment

IR Receiver

ASSP

ATA2525

1. Description

The IC ATA2525 is a complete IR receiver for data communication that was devel-

oped 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 flexibil-

ity for assembly of IR receiver modules. The ATA2525 is available with standard

carrier frequencies (33, 36, 37, 38, 40 kHz) and 3 different noise suppression regula-

tion types (standard, lamp, noise) covering requirements of different high-volume

remote control solutions (please refer to selection guide available for

ATA2525/ATA2526). The ATA2525 operates in a supply voltage range of 4.5V to

5.5V.

The function of 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 infor-

mation 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.

4854E–AUTO–10/06

Share Link: