DS8907 - Phase-Locked Loop Frequency Synthesizer

National Semiconductor

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Datasheet Details

Part number	DS8907
Manufacturer	National Semiconductor
File Size	164.84 KB
Description	Phase-Locked Loop Frequency Synthesizer
Datasheet	DS8907_NationalSemiconductor.pdf

DS8907 Product details

Description

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 for each frequency and logic state information for radio function inputs outputs The Colpitts reference oscillator for the PLL operates at

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.

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Published: Mar 30, 2005 |