GENERAL DESCRIPTION
The UMA1015M is a low-power dual frequency synthesizer for radio communications which operates in the 50 to 1100 MHz frequency range. Each synthesizer consists of a fully programmable main divider, a phase and frequency detector and a charge pump. There is a fully programmable reference divider common to both synthesizers which operates up to 35 MHz. The device is programmed via a 3-wire serial bus which operates up to 10 MHz.

FEATURES
• Two fully programmable RF dividers up to 1.1 GHz
• Fully programmable reference divider up to 35 MHz
• 2 : 1 or 1 : 1 ratio of selectable reference frequencies
• Fast three-line serial bus interface
• Adjustable phase comparator gain
• Programmable out-of-lock indication for both loops
• On-chip voltage doubler
• Low current consumption from 3 V supply
• Separate power-down mode for each synthesizer
• Up to 4 open-drain output ports.

APPLICATIONS
• Cordless telephone
• Hand-held mobile radio.