Audio ASSP | LC72121M

PLL Frequency Synthesizer for Electronic Tuning

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The LC72121M is high input sensitivity PLL frequency synthesizer for 3 V systems. This IC is serial data compatible with the LC72131, and feature the improved input sensitivity and lower spurious radiation (provided by a redesigned ground system) required in high-performance AM/FM tuners.

  • PLL frequency synthesizer for 3 V systems
  • High-speed programmable divider
    FMIN: 10 to 160 MHz ... Pulse swallower technique
    (With built-in divide-by-2 prescaler)
    AMIN: 2 to 40 MHz ... Pulse swallower technique
    0.5 to 10 MHz ... Direct division technique
  • IF counter
    IFIN: 0.4 to 15 MHz ... For AM and FM IF counting
  • Reference frequency
    One of 12 reference frequencies can be selected
    (using a 4.5 or 7.2 MHz crystal element)
    1, 3, 5, 9, 10, 3.125, 6.25, 12.5, 15, 25, 50, and 100 kHz
  • Phase comparator
    Supports dead zone control.
    Built-in unlocked state detection circuit
    Built-in deadlock clear circuit
  • An MOS transistor for an active low-pass filter is built in.
  • I/O ports
    Output-only ports: 4 pins
    I/O ports: 2 pins
    Supports the output of a clock time base signal.
  • Operating ranges
    Supply voltage: 2.7 to 3.6 V
    Operating temperature: -40 to 85°C

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