SA7026

The SA7026 BICMOS device integrates programmable dividers, charge pumps and a phase comparator to implement a phase-locked loop. The SA7026 is designed to operate from 3 NiCd cells, in pocket phones, with low current and nominal 3 V supplies.

The synthesizer of SA7026 operates at VCO input frequencies up to 1.3 GHz. The synthesizer has fully programmable main, auxiliary and reference dividers. All divider ratios are supplied via a 3-wire serial programming bus.

Separate power and ground pins of SA7026 are provided to the analog and digital circuits. The ground leads should be externally short-circuited to prevent large currents flowing across the die and thus causing damage. V_DDCP must be greater than or equal to V_DD.

The charge pump current (gain)of SA7026 is set by an external resistance at RSET pin. Passive loop filters could be used; the charge pump operates within a wide voltage compliance range to provide a wider tuning range.