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.

Pin	Name	Decription
1	GND	Ground
2	FIN	VCO Oscillator Input
3	MS	Mode Select - HIGH=40 Channels ROM - LOW=Binary input (N=3-255)
4	PO	Programable Divider Output
5	DO	Reference Divider Output
6	AO	Loop filter Amplifier Output
7	AI	Loop filter Amplifier Input
8	PD	Phase Detector output
9	LD	Loop Detector output - Locked=HIGH Unlocked=LOW
10	VDD	Positive Power Supply (+5Volt)
11	I	Inhibit
12	P1	Binary programable input 1
13	P2	Binary programable input 2
14	P3	Binary programable input 3
15	P4	Binary programable input 4
16	P5	Binary programable input 5
17	P6	Binary programable input 6
18	P7	Binary programable input 7
19	P8	Binary programable input 8
20	1/2R	Referency frequency divided by 2
21	RI	Referency oscillator Input (X-tal)
22	RO	Refeerency oscillator Output (X-tal)

Explanation of pin function terms

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