General Description
The TH72001 FSK transmitter IC is designed for applications in the 315 MHz industrial-scientific-medical (ISM) band. It can also be used for any other system with carrier frequencies ranging from
290 MHz to 350 MHz.
The transmitter's carrier frequency fc is determined by the frequency of the reference crystal fref. The integrated PLL synthesizer ensures that carrier frequencies, ranging from 290 MHz to 350 MHz, can be achieved. This is done by using a crystal with a reference frequency according to: fref = fc/N, where N = 32 is the PLL feedback divider ratio.

*Fully integrated PLL-stabilized VCO
*Frequency range from 290 MHz to 350 MHz
*Single-ended RF output
*FSK through crystal pulling allows modulation from DC to 40 kbit/s
*High FSK deviation possible for wideband data transmission
*Wide power supply range from 1.95 V to 5.5 V
*Very low standby current
*On-chip low voltage detector
*High over-all frequency accuracy
*FSK deviation and center frequency independently adjustable
*Adjustable output power range from -12 dBm to +11 dBm
*Adjustable current consumption from 3.2 mA to 10.3 mA
*Conforms to FCC part 15 and similar standards
*8-pin Small Outline Integrated Circuit (SOIC)

Application Examples
*General digital data transmission
*Tire Pressure Monitoring Systems (TPMS)
*Remote Keyless Entry (RKE)
*Wireless access control
*Alarm and security systems
*Garage door openers
*Remote Controls
*Home and building automation
*Low-power telemetry systems


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