Overview

The LC72140 and LC72140M are high-performance, phase-locked loop (PLL) frequency synthesizers that operate over the VHF, MW and LW wave bands. They feature excellent frequency tracking, making them ideal as a reference frequency source for use in AM/FM radio receivers. The LC72140 and LC72140M operate from a 5V supply. The LC72140 is available in 24-pin DIPs, and the LC72140M, in 24-pin MFPs.

Features

● High-speed programmable dividers for

• 10 to 160MHz on FMIN using pulse swallower.

• 0.5 to 40.0MHz on AMIN using pulse swallower and direct division.

● General-purpose counters (used together with the SD in IF count mode).

• HCTR for 0.4 to 25.0MHz frequency measurement.

• LCTR for 10 to 500kHz frequency measurement and 1Hz to 20kHz period measurement.

● 4.5 or 7.2MHz crystal.

● Twelve selectable reference frequencies (1, 3, 5, 9, 10, 3.125, 6.25, 12.5, 25, 30, 50 and 100kHz).

● Phase comparator.

• Insensitive band control.

• Unlock detection.

• Sub-charge pump for high-speed locking.

• Deadlock clear circuit.

● C2B input/output data interface.

● Power-ON reset circuit.

● Built-in MOS transistor for a low-pass filter.

● Inputs/outputs (using five general-purpose input/output ports).

• Maximum of seven inputs.

• Maximum of seven outputs (three n-channel open-drain and four CMOS outputs).

● 5V supply.

● 24-pin DIP (LC72140) and 24-pin MFP (LC72140M).