UMA1020

INTEGRATED CIRCUITS DATA SHEET UMA1020AM Low-voltage dual frequency synthesizer for radio telephones Product specification Supersedes data of November 1994 File under Integrated Circuits, IC03 1995 Jul 06 Philips Semiconductors Product specification Low-voltage dual frequency synthesizer for radio telephones FEATURES 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 Dual power-down modes. APPLICATIONS 1 to 1.7 GHz mobile telephones Portable battery-powered radio equipment. GENERAL DESCRIPTION The UMA1020AM 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. QUICK REFERENCE DATA SYMBOL VCC, VDD ICC + IDD PARAMETER supply voltage principal synthesizer supply current principal and auxiliary synthesizer supply current ICCPD, IDDPD fVCO fAI fXTAL fPPC fAPC Tamb current in power-down mode per supply principal input frequency auxiliary input frequency crystal reference input frequency principal phase comparator frequency auxiliary phase comparator frequency operating ambient temperature CONDITIONS VCC ≥ VDD auxiliary synth...