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ATMEL Corporation - IR RECEIVER ASSP

Numéro de référence T2525
Description IR RECEIVER ASSP
Fabricant ATMEL Corporation 
Logo ATMEL Corporation 





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T2525 fiche technique
Features
No Ewxtwewrn.DaaltCaSohmeepto4Un.ecnomts Except PIN Diode
Supply-voltage Range: 4.5V to 5.5V
Highest Sensitivity Due to Automatic Sensitivity Adaption (AGC) and Automatic Strong
Signal Adaption (ATC)
Highest Immunity Against Disturbances from Daylight and Lamps
Available for Carrier Frequencies between 30 kHz to 76 kHz; Adjusted
by Zener Diode Fusing
TTL and CMOS Compatible
Suitable Minimum Burst Length 10 Pulses/Burst
Applications
Home Entertainment Applications (Audio/Video)
Home Appliances
Remote Control Equipment
IR Receiver
ASSP
T2525
1. Description
The IC T2525 is a complete IR receiver for data communication that was 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 T2525 is available with broadest range of carrier frequencies (30, 33, 36,
37, 38, 40, 44, 56, 76 kHz) and 5 different noise suppression regulation types (stan-
dard, lamp, noise, short burst, data rate) covering requirements of high-end remote
control solutions (please refer to selection guide available for T2525/ATA2526). The
T2525 operates in a supply voltage range of 4.5V to 5.5V.
The function of T2525 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.
4657F–AUTO–10/06

PagesPages 12
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