GENERAL DESCRIPTION

The UMA1020AM BICMOS device integrates prescalers, programmable dividers, and phase comparators to implement two phase-locked loops. The device is designed to operate from 3 NiCd cells, in pocket phones, with low current and nominal 5 V supplies.

FEATURES

• Low current from 3 V supply

• Fully programmable RF divider

• 3-line serial interface bus

• Second synthesizer to control first IF or offset loop frequency

• Independent fully programmable reference dividers for each loop, driven from external crystal oscillator

• Dual phase detector outputs to allow fast frequency switching

• Dual power-down modes.

APPLICATIONS

• 1 to 1.7 GHz mobile telephones

• Portable battery-powered radio equipment.