Audio ASSP | LC72121MA

PLL Frequency Synthesizers for Electronic Tuning

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The LC72121MA are high input sensitivity (20 mVrms at 130 MHz) PLL frequency synthesizers for 3 V systems. These ICs are serial data compatible with the LC72131K/KMA, and feature the improved input sensitivity and lower spurious radiation (provided by a redesigned ground system) required in high-performance AM/FM tuners.

  • 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 15MHz (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.
  • Serial data I/O :
    Support 'computer control bus' format communication with the system controller.
  • Operating ranges
    Supply voltage: 2.7 to 3.6 V
    Operating temperature: -40 to +85°C

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LC72121MA-AH

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Obsolete

CAD Model

Pb

A

H

P

SOIC-24 W / MFP-24SJ

751DB

4

260

REEL

2000

N

PLL Frequency Synthesizer

-

-

200

2.7

3.6

-40

85

Price N/A

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