Am/fm Digital Phase-locked Loop Synthesizer

The DS8906 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 a 20-bit shift regis- ter/latch for serial data entry. The device is designed to operate with a serial data controller generating the neces- sary division codes for each frequency, and Logic state infor- mation for Radio function inputs/outputs. The Colpitts reference Oscillator for the PLL operates at 4 MHz. A chain of dividers is used to generate a 500 kHz Clock signal for the external controller. Additional dividers generate a 12.5 kHz reference signal for FM and a 500 Hz reference signal for AM/SW. One of these reference signals is selected by the data from the controller for use by the phase Comparator Additional dividers are used to generate a 50 Hz Timing signal used by the controller for time-of- day. Data is transferred between the Frequency Synthesizer and the controller via a 3 wire bus system. This consists of a data input line, an enable line and a Clock line. When the enable line is low, data CAN be shifted from the controller into the Frequency Synthesizer When the enable line is tran- sitioned from low to high, data entry is disabled and data present in the Shift register is latched. By National Semiconductor Corporation
DS8906 's PackagesDS8906 's pdf datasheet

DS8906 Pinout, Pinouts
DS8906 pinout,Pin out
This is one package pinout of DS8906,If you need more pinouts please download DS8906's pdf datasheet.

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