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, 1kHz

• Phase comparator

• 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  Support clock time base output

• Serial data I/O

• Support CCB format communication with the system controller.

• Operating ranges

• Supply voltage ........................4.5 to 5.5V  Operating temperature ............ -40 to +85C

• Packages

• DIP22S(300mil) / MFP20J(300mil)