ATA2526_09 Datasheet, PDF (1/14 Pages) ATMEL Corporation – Low-voltage IR Receiver ASSP

Features
• No External Components Except PIN Diode
• Supply-voltage Range: 2.7V to 5.5V
• High Sensitivity Due to Automatic Sensitivity Adaption (AGC) and Automatic Strong
Signal Adaption (ATC)
• Automatic Supply Voltage Adaptation
• High Immunity against Disturbances from Daylight and Lamps
• Small Size and Innovative Pad Layout
• Available for Carrier Frequencies between 33 kHz to 40 kHz and 56 kHz; Adjusted by
Zener Diode Fusing ±2.5%
• TTL and CMOS Compatible
Applications
• Home Entertainment Applications
• Home Appliances
• Remote Control Equipment
1. Description
The IC ATA2526 is a complete IR receiver for data communication that has been
developed and optimized for use in carrier-frequency-modulated transmission applica-
tions. 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 ATA2526 is available with standard frequencies
(33, 36, 37, 38, 40, 56 kHz) and 3 different noise suppression regulation types (stan-
dard, lamp, short burst), thus covering the requirements of different high-volume
remote control solutions (please refer to selection guide available for
ATA2525/ATA2526). The ATA2526 operates in a supply voltage range of 2.7V to
5.5V.
The function of the ATA2526 can be described using the block diagram of Figure 1-1
on page 2. 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.
Low-voltage
IR Receiver
ASSP
ATA2526
4905E–AUTO–09/09