LC72131K
Overview
The LC72131K and LC72131KMA are PLL frequency synthesizers for use in tuners in radio/cassette players. They allow high-performance AM/FM tuners to be implemented easily.
Features
- High speed programmable dividers
- FMIN: 10 to 160MHz …………………….. pulse swallower (built-in divide-by-two prescaler)
- AMIN: 2 to 40MHz ………………………. pulse swallower 0.5 to 10MHz …………………….. direct division
- IF counter
- IFIN: 0.4 to 12MHz ………………………. AM/FM IF counter
- Reference frequencies
- Twelve selectable frequencies (4.5 or 7.2MHz crystal)
- 100, 50, 25, 15, 12.5, 6.25, 3.125, 10, 9, 5, 3, 1k Hz
- Phase parator
- Dead zone control
- Unlock detection circuit
- Deadlock clear circuit
- Built-in MOS transistor for forming an active low-pass filter
- I/O ports
- Dedicated output ports: 4
- Input or output ports: 2
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