RF PLL synthesizer integrated circuit, double RF input both up to 1.1 GHz, power supply 2.7 to 5.5V, SMD SO-16 package, with dual modulus prescaler 64/65 or 128/129, 3-wires serial input (Data/Enable/Clock)
The double synthesizer is often used as first LO and LO for the second IF for the second PLL