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IR receiver features low supply current

Posted: 21 Jan 2009     Print Version  Bookmark and Share

Keywords:IR receiver  ambient light  gain control  IR emitter 

TSOP5038

Vishay Intertechnology has expanded its optoelectronics portfolio with the availability of a compact SMD IR receiver optimised for sensor and light barrier systems.

With its fast reaction times, insensitivity to supply voltage ripple and EMI noise, and low supply current of 0.85mA typical at 5 V, the fixed gain device provides consistent performance in all ambient light conditions.

In mid- to long-range reflective sensor systems and IR light barrier systems, such as garage door openers, urinals, and other "presence of object" systems, gain control must be handled differently than in remote applications.

In remote applications, the automatic gain control (AGC) adjusts the gain in response to ambient light levels, spurious noise, and other criteria in order for the receiver to continue responding to the data signal while rejecting stray noise. But variable gain is not desired in sensor applications, as this greatly complicates the design. In addition, sensor applications require fast reaction times in order to operate at a continuous 38-kHz signal.

The TSOP5038 solves both of these problems by offering a high fixed gain in all ambient light environments, and allows a short burst repetition time that results in a fast 300-µs reaction time. Continuous signals at 38kHz or 38kHz bursts may be used to drive the IR emitter. To simplify the design, an internal IR filter suppresses visible light.

To further simplify designs, the TSOP5038 features a photo detector and preamplifier in one package. The highly sensitive device offers a 0.5-mW/sqm typical irradiance and a supply voltage from 2.7 V to 5.5 V. The receiver is complaint with RoHS 2002/95/EC and WEEE 2002/96/EC.

Samples and production quantities of the TSOP5038 are available now, with lead times of eight weeks for large orders.





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