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