GENERAL DESCRIPTION

The UMA1017M BICMOS device integrates prescalers, a programmable divider, and 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 5 V supplies.

The synthesizer operates at RF input frequencies up to 1.25 GHz. The synthesizer has a fully programmable reference divider. All divider ratios are supplied via a 3-wire serial programming bus.

FEATURES

• Low current from 3 V supply

• Fully programmable RF divider

• 3-line serial interface bus

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

• Dual phase detector outputs to allow fast frequency switching

• Dual power-down modes.

APPLICATIONS

• 900 MHz mobile telephones

• Portable battery-powered radio equipment.