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