DESCRIPTION
The SC72131 is phase-locked loop (PLL) LSI for digital turning systems (DTS).
The LSI is use to configure high-performance digital tuning systems,such as radio/cassette players. They allow high-performance AM/FM tuners to be implemented easily.

FEATURES
* Built-in prescalers. Operate at input frequency ranging from 10~160MHz during FMIN input and at 0.5~40MHz during AMIN input.
* 12 possible reference frequencies (with 4.5 or 7.2 MHz crystal) 1, 3, 5, 9, 10, 3.125, 6.25, 12.5, 15, 25, 50 and 100 kHz
* Built-in 20bit general-purpose counter for such as measuring intermediate frequency (IF), IF input frequency ranging from 0.4M~12MHz.
* Has an unlock detector circuitˈan dead zone control circuit and an deadlock clear circuit
* Built-in MOS transistor for forming an active low-pass filter
* 4 N-channel open-drain output ports (OFF withstanding Voltage: 13V) and 2 input or output ports.
* Serial data I/O
  — All functions controlled through 4 serial bus lines
* Operating ranges
  — Supply voltage.....................… 5.0±0.5 V
  — Operating temperature........–40 to +85° C
* Packages
  — SDIP-22-300-1.78
  — SOP-20-300-1.27

APPLICATIONS
* Digital Tuning Systems