Overview

The LC72122V is a low-voltage (1.8 to 3.6 V) PLL frequency synthesizer IC that allows portable TV (VHF)/FM/AM tuners to be constructed easily.

Features

• High-speed programmable frequency divider

— FMIN: 10 to 250 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 nine frequencies (crystal oscillator: 75 kHz) 1, 2.5, 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

— Sub-charge pump for fast frequency locking

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

• I/O ports

— Dedicated output ports: 3

— 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: 1.8 to 3.6 V

— Operating temperature: –20 to +70°C

• Package

—SSOP20