GENERAL DESCRIPTION

The UMA1018M 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

? Integrated digital-to-analog converter

? Dual power-down modes.

APPLICATIONS

? 900 MHz mobile telephones

? Portable battery-powered radio equipment.