GENERAL DESCRIPTION

The UMA1021M BICMOS device integrates a prescaler, programmable dividers, and a phase comparator to implement a phase-locked loop.

The device is designed to operate from 3 NiCd cells, in pocket phones, with low current and nominal 3 V supplies.

FEATURES

• Low phase noise

• Low current from 3 V supply

• Fully programmable main divider

• 3-line serial interface bus

• Independent fully programmable reference divider, driven from external crystal oscillator

• Dual charge pump outputs

• Hard and soft power-down control.

APPLICATIONS

• 900 MHz and 2 GHz mobile telephones

• Portable battery-powered radio equipment.