SP5026

The SP5026 is a programming variant of the SP5510, allowing the design of one tuner with either 1²C bus or 3-wire bus format depending on which device is inserted. The SP5026, when used with a TV varicap tuner, forms a complete phase locked loop tuning system. The circuit consists of a divider-by-8 prescaler with its own preamplifier and at 5-bit programmable divider controlled by a serially-loaded data register. Four open-collector outputs, each independently programmable, are included. The device has two modes of operation, selected by the "mode select" input. In mode 1, the comparison frequency is 7.8125kHz and the programmable divider MSB is bypassed; mode 2 comparison frequency is 3.90625kHz. The comparison frequencies are both obtained from a 4MHz crystal controlled on-chip oscillator.