The Melexis TH72002 ASK 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 to 350 MHz. The transmitter's carrier frequency is determined by the frequency of the reference crystal. The integrated phase-locked loop (PLL) synthesizer ensures that carrier frequencies, ranging from 290 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.
Features
Application examples
Fully integrated PLL-stabilized VCO
Frequency range from 290MHz to 350MHz
Single-ended RF output
ASK achieved by on/off keying of internal power amplifier up to 40kbit/s
Wide power supply range from 1.95V to 5.5V
Operating temp. range from -40°C to +125°C
Very low standby current
On-chip low voltage detector
High over-all frequency accuracy
Adjustable output power range from -10dBm to max. +11dBm
Adjustable current consumption from 3.2mA to 10.3mA
