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MC145149 - Dual PLL Frequency Synthesizer

General Description

INPUT PINS OSCin, OSCout Reference Oscillator Input/Output (Pins 15, 16) These pins form a reference oscillator when connected to terminals of an external parallel

resonant crystal.

setting capacitors of appropriate value must be connected from OSCin and OSCout to ground.

Key Features

  • ternal reference, OSCout should be left open. fin1, fin2 Frequency Inputs (Pins 4, 7) Input frequency from an external VCO output. Each rising.
  • edge signal on fin1 decrements the N counter, and when appropriate, the A counter of PLL 1. Similarly, fin2 decrements the counters of PLL 2. These inputs have inverters biased on the linear region which allows ac coupling for signals as low as 500 mV p.
  • p. With square wave signals which swing from VSS to VDD, dc coupling may be used. DATA.

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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MOTOROLA SEMICONDUCTOR TECHNICAL DATA Order this document by MC145149/D MC145149 Dual PLL Frequency Synthesizer Interfaces with Dual–Modulus Prescalers The MC145149 contains two PLL Frequency Synthesizers which share a common serial data port and common reference oscillator. The device contains two 14–stage R counters, two 10–stage N counters, and two 7–stage A counters. All six counters are fully programmable through a serial port. The divide ratios are latched into the appropriate counter latch according to the last data bits (control bits) entered. When combined with external low–pass filters and voltage controlled oscillators (VCOs), the MC145149 can provide all the remaining functions for two PLL frequency synthesizers operating up to the device’s frequency limit.