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HT16C2T3/HT16E2T3/HT16G2T3, HT16C2T4/HT16E2T4/HT16G2T4, HT12C2T3/HT12E2T3, HT12C2T4/HT12E2T4 -- 216/212RF Encoder General Description The HT16x2Tx/HT12x2Tx are a series of encoders which include a 300M~450MHz ASK transmitter for remote control system applications. These highly integrated devices are true "switchin, antenna-out" monolithic devices. They are capable of encoding information consisting of N address bits and 16- N data bits. Each address/data input can be set to one of two logic states. The programmed addresses/data is transmitted together with the header bits via RF upon receipt of a trigger signal. The capability to select a DATA trigger on the HT16x2Tx/HT12x2Tx further enhances the application flexibility of the 216 series of encoders. The devices offer high performance in the areas of power delivery and operating temperature. In terms of power, the devices are capable of delivering +10 dBm into a 50W load. This power level enables a small form factor transmitter such as a key fob transmitter to operate near the maximum limit of transmission regulations. In terms of temperature, the devices can operate from -40°C to 85°C with minor frequency drift. When compared with SAW solutions, wider operation temperatures are obtainable. The also offer exceptional ease of use. It is only necessary to provide a crystal reference frequency source, which has a frequency equal to the RF carrier frequency divided by 32, together with a few additional external components to implement a complete and versatile transmitter. The devices operate using ASK/OOK - Amplitude Shift Keying/On-Off Keyed - UHF receiver types from wide-band super-regenerative radios to narrow-band, high performance superheterodyne receivers.
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