HT9831 -- 315/433MHz ASK Transmitter

General Description

The HT9831 is a highly integrated ASK transmitter IC for remote wireless applications in the 300 to 450MHz frequency band. This transmitter IC is a true "data-in, antenna-out" monolithic device making it very easy for users to implement a wireless system. It is only necessary to supply a crystal generated reference frequency, which is the RF carrier frequency divided by 32, and a few additional external parts to create a complete and versatile transmitter. The HT9831 is capable of delivering +9.5dBm into a 50ohms load. This power level is possible due to a small form factor transmitter (lossy antenna) which can operate near the maximum transmission regulation limit. The HT9831 utilises ASK/OOK - Amplitude Shift Keying/On-Off Keying- UHF receiver types from wide-band super-regenerative radios to narrow-band, high performance super-heterodyne receivers.

The HT9831 minimum ASK data rate is 10kbps which supports a more complicated control protocol.

To minimise power consumption, the HT9831 provides a data tracking function. In the Idle Mode, the internal PLL will be switched off, but when high to low data is received the PLL will be switched on and data will be transmitted without delay. The PLL will be turned off automatically and the HT9831 will return to the Idle Mode after no data input transients have been received for more than 300ms. As there is a reference clock output for the MCU, the MCU can use its internal RC clock ather than using an additional crystal for precise timing. With these combined features the HT9831 can provide
a power-saving and cost effective solution for a huge range of remote wireless applications.

Features

• Complete UHF ASK transmitter
• Frequency range 300MHz to 450MHz
• Data rates higher than 10kbps
• Output Power up to 10dBm
• Low voltage operation - down to 2.0V
• Data tracking function for device wake-up
• Reference clock output
• 8-pin SOP/TSSOP packages

新手教學

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