Make your own free website on Tripod.com
Home

uPD2812 PLL Integrated Circuits


Overview

This 27 MHz band, PLL frequency synthesizer LSI chip is designed specifically for CB transceivers. The integrated circuit`s incorporates PLL circuitry and a controller for CB applications on a single CMOS chip.
This PLL-circuit use a 8 bit BCD binary programmable divide-by-N counter or 6 bit ROM programmable divide-by-N counter. The ROM-table is programmed from factory to 40 channels.

PinNameDecription
1GNDGround
2FINVCO Oscillator Input
3MSMode Select - HIGH=40 Channels ROM - LOW=Binary input (N=3-255)
4POProgramable Divider Output
5DOReference Divider Output
6AOLoop filter Amplifier Output
7AILoop filter Amplifier Input
8PDPhase Detector output
9LDLoop Detector output - Locked=HIGH Unlocked=LOW
10VDDPositive Power Supply (+5Volt)
11IInhibit
12P1Binary programable input 1
13P2Binary programable input 2
14P3Binary programable input 3
15P4Binary programable input 4
16P5Binary programable input 5
17P6Binary programable input 6
18P7Binary programable input 7
19P8Binary programable input 8
201/2RReferency frequency divided by 2
21RIReferency oscillator Input (X-tal)
22RORefeerency oscillator Output (X-tal)

Explanation of pin function terms



CB Radio Banner Exchange