The DS8908B is a PLL synthesizer designed specifically for use in AM FM radios It contains the reference oscillator a phase comparator a charge pump an operational amplifier a 120 MHz ECL I2L dual modulus programmable divider and a 19-bit shift register latch for serial data entry The device is designed to operate with a serial data controller generating the necesary division codes for each frequency and logic state information for radio function inputs outputs A 3 96 MHz pierce oscillator and divider chain generate a 1 98 MHz external controller clock a 20 kHz 10 kHz 9 kHz and a 1 kHz reference signals and a 50 Hz time-of-day signal The oscillator and divider chain are sourced by the VCCM pin thus providing a low power controller clock drive and time-of-day indication when the balance of the PLL is powered down