UMA1018M - Low-voltage dual frequency synthesizer for radio telephones

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.

• 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.