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IR receivers built for 3D TV glasses

Posted: 05 Aug 2010 ?? ?Print Version ?Bookmark and Share

Keywords:infrared? receiver? LCD? 3D? TV?

Vishay Intertechnology Inc. has released a pair of infrared receivers developed specifically for the LCD shutter glasses used with 3D-ready TV sets.

The TSOP75D25 and TSOP35D25 IR receivers are designed to be assembled into active 3D glasses, where they receive infrared signals from the TV set and ensure the glasses' LCD shutters open and close in proper synchronization to create the 3D effect.

The receivers are designed to operate on a carrier frequency of 25kHz, which is lower than that used by standard remote control systems and thus helps avoid possible interference from TV and set-top box remote controls. Because TV remote control emitters and receivers operate at a wavelength of 940 nm, the TSOP75D25 and TSOP35D25 are designed to receive the 3D synchronization signals from an 830 nm or 850 nm emitter, further avoiding the possibility of interference.

The TSOP75D25 and TSOP35D25 pack a photodiode, amplifier, automatic gain control, band pass filter, demodulator, and control IC into a single tiny package. The TSOP75D25 measures 2.3 mm x 3.0 mm x 6.8 mm and has dual lenses while the TSOP35D25 measures 4.0 mm x 5.3 mm x 7.5 mm and has a single lens.

The TSOP75D25 and TSOP35D25 are surface mount devices that can be mounted in a side or top view. They both have a viewing angle of 50?.

Pricing and availability: Samples are available now. Production orders have a lead time of six to eight weeks. Pricing for U.S. delivery in small quantities is $1.00.

- EE Times

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