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LC5121 PLL Frequency Synthesizer

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Overview

This 27 MHz band, PLL frequency synthesizer LSI chip is designed specifically for CB transceivers. The LC7185-8750 incorporates PLL circuitry and a controller for CB applications on a single CMOS chip. The controller handles the PLL circuitry, frequency data ROM, channel preset/recall RAM, and LED display driver. It also supports channel preset/recall, and emergency channel call.
This PLL-circuit use a ROM programmable divide-by-N counter. The ROM-table is programmed from factory.

Pin | Name | Description
--- | --- | ---
1 | SA | Display Segment A
2 | SB | Display Segment B
3 | SC | Display Segment C
4 | SD | Display Segment D
5 | SE | Display Segment E
6 | SF | Display Segment F
7 | SG | Display Segment G
8 | Vss | Ground
9 | XO | X-tal Output
10 | XI | X-tal Input
11 | GND | Ground
12 | F in | VCO Frequency Input
13 | Vcc | Positive Voltage Supply
14 | AO | Loop filter Amplifier Output
15 | AI | Loop filter Amplifier Input
16 | DO | Phase Detector Output
17 | LD | Loop Detected
18 | T/R | Transmit / Receive
19 | EMG | Channel 9
20 | U/D | Program UP / Program DOWN
21 | RFST |
22 | DI | Display Segment Select output

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