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Atmel Electronic Components Datasheet

ATA2536T Datasheet

Low-voltage IR Receiver ASSP

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ATA2536T
Low-voltage IR Receiver ASSP
DATASHEET
Features
Highly integrated device with no external components except PIN diode
Supply-voltage range: 2.7V to 5.5V
High sensitivity due to automatic sensitivity adaptation (AGC) and automatic strong
signal adaptation (ATC)
Automatic supply voltage adaptation
High immunity against disturbances from daylight and lamps
Small size and innovative pad layout
Available for carrier frequencies between 36kHz to 40kHz
TTL and CMOS compatible
Applications
Home entertainment applications
Home appliances
Remote control equipment
9226C-AUTO-05/14


Atmel Electronic Components Datasheet

ATA2536T Datasheet

Low-voltage IR Receiver ASSP

No Preview Available !

1. Description
The Atmel® IC ATA2536T is a complete IR receiver for data communication 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 ATA2536T is recommended in LCD TV application (noise environment by backlight interference) with
IR protocols using 375µs maximum burst length of data bits, available with standard frequencies (36, 37, 38, 40kHz) and 3
different noise suppression regulation types (standard, lamp, short burst). The ATA2536T operates in a supply voltage range
of 2.7V to 5.5V.
The function of the Atmel ATA2536T can be described using the block diagram of Figure 1-1 on page 2. The input stage has
two main functions. Firstly, 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 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
Modulated IR Signal
min 6 or 10 Pulses
Oscillator
AGC/ATC and Digital Control
GND
ATA2536T
2 ATA2536T [DATASHEET]
9226C–AUTO–05/14


Part Number ATA2536T
Description Low-voltage IR Receiver ASSP
Maker ATMEL
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ATA2536T Datasheet PDF






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