SM5124A

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SM5124A PLL Synthesizer

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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 ROM programmable divide-by-N counter. The ROM-table is programmed from factory to 40 channels.

Pin | Name | Description
--- | --- | ---
1 | Q in | Internal quartz crystal oscillator circuit input
2 | Q out | Internal quartz crystal oscillator circuit output
3 | VDD | Power supply 5,7 to 6,3 Volt
4 | LD | UNLOCKED signal output. Unlocked: Low, Locked: High
5 | DO | Phase detector output. Charge pump circuit for active filter
6 | AI | Amplifier input
7 | AO | Amplifier output
8 | T/R | Transmit/receiving switch. Transmit: High, Receive: Low
9 | F in | Programmable counter input
10 | P0 | Channel switching input
11 | P1 | Channel switching input
12 | P2 | Channel switching input
13 | P3 | Channel switching input
14 | P4 | Channel switching input
15 | P5 | Channel switching input
16 | P6 | Channel switching input
17 | P7 | Channel switching input
18 | VSS | Ground

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