HT16x2Tx/HT12x2Tx
216/212 RF Encoder
Features
Operating voltage: 2V ~ 3.6V
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Low standby current: 1µA (typ.) at VDD=3V
Data trigger function
Provides 2 compound Data trigger pins
Minimum four transmission words
Integrated oscillator – no external resistor
Positive polarity data codes
Integrated complete UHF transmitter
Frequency range 300MHz to 450MHz
Support ASK/OOK modulation
Output power up to 10dBm
Minimal external components
20-pin SSOP
Applications
Burglar alarm systems
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Smoke and fire alarm systems
Personal alarm system
Car/Garage door controllers
Home/office/car security systems
Cordless telephones
Other remote control systems
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 “switch-
in, 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 50Ω 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 super-
heterodyne receivers.
Rev. 1.00
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HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
