DESCRIPTION

The SC9257 is phase-locked loop (PLL) LSIs for digital tuning systems (DTS) with built in 2 modulus prescalers. All functions ate controlled through 3 serial bus lines. These LSIs are used to configure high-performance digital tuning system.

FEATURES

* Optimal for configuring digital tuning systems in high-fi tuners and car stereos.

* built-in prescalers. Operate at input frequency ranging from 30~150 MHz during FMIN input (with 2 modulus prescaler) and at 0.5~40MHz during AMIN input (with 2 modulus prescaler or direct dividing).

* 16 bit programmable counter, dual parallel output phase comparator, crystal oscillator and reference counter.

* 3.6MHz, 4.5MHz, 7.2MHz or 10.8MHz crystal oscillators can be used.

* 15 possible reference frequencies. ( When using 4.5MHz crystal)

* Built-in 20 bit general-purpose counter for such uses as measuring intermediate frequencies (IFIN1 and IFIN2) and low frequency pilot signal cycles (SCIN).

* High-precision (±0.55~±7.15µs) PLL phase error detection.

* Numerous general-purpose I/O pins for such uses as peripheral circuit control.