T2526 View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

T2526

Low-voltage IR Receiver ASSP

Atmel Corporation 

1. Description

The Atmel® IC T2526 is a complete IR receiver for data communication developed and optimized for use in carrier-

frequency-modulated transmission applications. The IC offers highest sensitivity as well as highest suppression of noise

from daylight and lamps. The Atmel T2526 is available with broadest range of frequencies (30, 33, 36, 37, 38, 40, 44, 56kHz)

and 3 different noise suppression regulation types (standard, lamp, short burst) covering requirements of high-end remote

control solutions (please refer to selection guide available for Atmel T2525/T2526). Atmel The T2526 operates in a supply

voltage range of 2.7V to 5.5V.

The function of the Atmel T2526 can be described using the block diagram of 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 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. All 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 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

Oscillator

Modulated IR signal

min 6 or 10 pulses

2. Pin Description

Table 2-1. Pin Description

Symbol

Function

VS

Supply voltage

OUT

Data output

IN

Input PIN-diode

GND

Ground

AGC/ATC

and digital control

GND

T2526

2

T2526 [DATASHEET]

4597J–AUTO–04/14

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