RF Transmitter 433MHz FSK

The TH72011 FSK transmitter IC's carrier frequency is determined by the frequency of the reference crystal fref. The integrated phase-locked loop (PLL) synthesizer ensures that carrier frequencies, ranging from 380 to 450 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 380 to 450 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 to 5.5 V
Operating temperature range -40 °C to +125 °C
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 -11 dBm to +10 dBm
Adjustable current consumption from 3.4 mA to 10.6 mA
8-pin Small Outline Integrated Circuit (SOIC)