DS8907 - National Semiconductor

DS8907 Phase-Locked Loop Frequency Synthesizer

The DS8907 is a PLL synthesizer designed specifically for use in AM FM radios It contains the reference oscillator a phase comparator a charge pump a 120 MHz ECL I2L dual modulus programmable divider and an 18-bit shift register latch for serial data entry The device is designed to operate with a serial data controller generating the necessary division codes.

Features

Y Y Y Y Y Y Y Uses inexpensive 4 MHz reference crystal FIN capability greater than 120 MHz allows direct synthesis at FM frequencies FM resolution of 25 kHz allows usage of 10 7 MHz ceramic filter distribution Serial data entry for simplified control 50 Hz output for ‘‘time-of-day’’ reference driven from separate low power VCCM 5-open collector buffered outputs for controlling various radio functions Separate AM and FM inputs AM input has 15 mV (typical) hysteresis Connection Diagram Dual-In-Line Package Order Number DS8907N See NS Package Number N20A TL F 7511
  – 1 Top View TRI-STATE.