描述 Description

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.

特性 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.