Overview

The LC72137 and LC72137M are PLL frequency synthesizers for use in radio/cassette players. They allow high-performance AM/FM tuners to be implemented easily.

Features

• High-speed programmable frequency divider

— FMIN: 10 to 160 MHz.....Pulse swallower (divide-by-two prescaler built in)

— AMIN: 2 to 40 MHz.........Pulse swallower 0.5 to 10 MHz......Direct division

• IF counter

IFIN: 0.4 to 12 MHz................For use as an AM/FM IF counter

• Reference frequency

— Selectable from one of eight frequencies (crystal oscillator: 75 kHz) 1, 3, 5, 3.125, 6.25, 12.5, 15, and 25 kHz

• Phase comparator

— Supports dead zone control

— Built-in unlock detection circuit

— Built-in deadlock clear circuit

• Built-in MOS transistor for forming an active low-pass filter

• I/O ports

— Dedicated output ports: 4

— I/O ports: 2

— Supports clock time base output

• Serial Data I/O

— Supports CCB format communication with the system controller.

• Operating ranges

— Supply voltage: 2.5 to 3.6 V

— Operating temperature: –20 to +70°C

• Packages

—DIP22S/MFP20