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
â 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.
â 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.
â 4.5 or 7.2MHz crystal.
â Twelve selectable reference frequencies (1, 3, 5, 9, 10, 3.125, 6.25, 12.5, 25, 30, 50 and 100kHz).
â Phase comparator.
⢠Insensitive band control.
⢠Unlock detection.
⢠Sub-charge pump for high-speed locking.
⢠Deadlock clear circuit.
â C2B input/output data interface.
â Power-ON reset circuit.
â Built-in MOS transistor for a low-pass filter.
â 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).
â 5V supply.
â 24-pin DIP (LC72140) and 24-pin MFP (LC72140M).
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