AT71231

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Description

    The  AT72131K and AT72131KM are PLL frequency synthesizers for use in tuners in radio/cassette players They allow high-performance AM/FM tuners to be implemented easily.

Features

  • High speed programmable dividers

  • FMIN:10 to 160MHZ………….pulse swallower(built-in divide-by-two prescaler)

  • AMIN:2 to 40MHZ……………..pulse swallower

  • 0.5 to 10MHZ…………..direct division

  • IF counter

  • IFIN:0.4 to 12  MHZ…………….AM/FM IF counter

  • Reference frequencies

  • Twelve selectable frequencies (4.5 or 7.2MHZ crystal)

  • 100,50,25,15,12.5,6.25,3.125,10,9,5,3,1KHZ

  • 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 date I/O

  • Support CCB format communication with the system controller

  • Operating ranges

  • Supply voltage……….4.5 to 5.5V

  • Operating temperature……….-40 to+85ºC

  • Packages:DIP22S/SOP20

Block Diagram