LC72131 - PLL Frequency Synthesizers

LC72131 - PLL frequency synthesizers

Overview

The LC72131 and LC72131M are PLL frequency synthesizers for use in tuners in radio/cassette players.
They allow high-performance AM/FM tuners to be implemented easily.

Applications: PLL frequency synthesizer
Functions:
• High speed programmable dividers
— FMIN: 10 to 160 MHz ..........pulse swallower (built-in divide-by-two prescaler)
— AMIN: 2 to 40 MHz ..............pulse swallower 0.5 to 10 MHz ...........direct division
• IF counter
— IFIN: 0.4 to 12 MHz ...........AM/FM IF counter
• Reference frequencies
— Twelve selectable frequencies (4.5 or 7.2 MHz crystal) 1, 3, 5, 9, 10, 3.125, 6.25, 12.5, 15, 25, 50 and 100 kHz
• Phase comparator
— Dead zone control
— Unlock detection circuit
— Deadlock clear circuit
• Built-in MOS transistor for forming an active low-pass filter
• I/O ports
— Dedicated output ports: 4
— Input or output ports: 2
— Support clock time base output
• Serial data I/O
— Support CCB format communication with the system controller.
• Operating ranges
— Supply voltage........................4.5 to 5.5 V
— Operating temperature............–40 to +85°C
• Packages
— DIP22S/MFP20