LC7120 PLL Frequency Synthesizer

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 6 bit ROM programmable divide-by-N counter. The ROM-table is programmed from factory.

Pin	Name	Description
1	P1	Programmable input 1
2	P2	Programmable input 2
3	P3	Programmable input 3
4	P4	Programmable input 4
5	P5	Programmable input 5
6	P6	Programmable input 6
7	IFS	IF Select - HIGH=10.695MHz LOW=9.785MHz
8	T/R	Transmit=LOW Receive=HIGH
9	Vcc	Positive Supply Voltage
10	RI	X-tal Input
11	RO	X-tal Output
12	RB	Oscillator Output (Buffered)
13	1/2R	Referency oscillator output divided by 2
14	F in	VCO Frequency Input
15	LD2	Loock Detector 2
16	LD1	Loock Detector 1
17	PD	Phase Detector Output
18	AI	Loop filter Amplifier Input
19	AO	Loop filter Amplifier Output
20	GND	Ground

This counter shows the number of hits since the 29th January 2000

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