IR receivers operate on 26.2kHz carrier frequency

Vishay Intertechnology Inc. has announced a couple of infrared (IR) receivers that are compliant with the Consumer Electronics Association's CEA-2038 standard for IR synchronization of 3D glasses with TVs. The TSOP75D26 and TSOP35D26 are designed to operate on a carrier frequency of 26.2kHz, which is lower than that used by standard remote control systems and helps avoid possible interference from TV and STB remote controls, stated the company.

The devices claim to be the industry's first surface-mount IR receivers designed to be assembled into active 3D glasses, where they receive IR signals from the TV and ensure the glasses' LCD shutters open and close in proper synchronization to create the 3D effect. According to the company, the receivers allow TV manufacturers to reduce the cost of the active 3D glasses, one of the main barriers to broader adoption of 3D TVs. With adoption of the CEA-2038 standard and use of the TSOP75- and TSOP35D26 receivers, consumers will be able to watch 3D programs on any TV set, added Vishay.

The TSOP75D26 and TSOP35D26 are designed to receive the 3D synchronization signals from an 830nm emitter, further avoiding the possibility of interference. They are compliant with the standard's long encoding command sequence that features better immunity in noisy environments, indicated Vishay. Additionally, the products feature suppression of optical noise from compact fluorescent lights, LCD backlights and plasma panels.

The receivers integrate a photodiode, amplifier, automatic gain control, band pass filter, demodulator and control IC into a single tiny package that helps cut the weight of 3D glasses. They also flaunt ultra-low current consumption that the company said maximizes battery life. The TSOP75D26 and TSOP35D26 can be mounted in a side or top view, and have viewing angles of ±50° that allow for significant head movement without signal loss. The TSOP75D26 measures 2.3 x 3 x 6.8mm and has dual lenses while the TSOP35D26 measures 4 x 5.3 x 7.5mm and has a single lens.

Samples of the TSOP75D26 and TSOP35D26 are available now.