UMA1021

INTEGRATED CIRCUITS DATA SHEET UMA1021AM Low-voltage frequency synthesizer for radio telephones Product specification Supersedes data of 1998 Mar 03 File under Integrated Circuits, IC17 1998 Nov 19 Philips Semiconductors Product specification Low-voltage frequency synthesizer for radio telephones FEATURES Low phase noise Low current from 3 V supply Fully programmable main divider 3-line serial interface bus Independent fully programmable reference divider, driven from external crystal oscillator Hard and soft power-down control. APPLICATIONS 900 MHz and 2 GHz mobile telephones Portable battery-powered radio equipment. GENERAL DESCRIPTION The UMA1021AM BICMOS device integrates a prescaler, programmable dividers, and a phase comparator to implement a phase-locked loop. QUICK REFERENCE DATA SYMBOL VDD1, VDD2 VCC Itot Itot(pd) fRF fxtal fph(comp) Tamb PARAMETER digital supply voltage total supply current (IDD + ICC) total supply current in Power-down mode (IDD + ICC) RF input frequency crystal reference oscillator input frequency phase comparator frequency operating ambient temperature CONDITIONS VDD1 = VDD2 = VDD VCC = VDD = 5.5 V logic levels 0 V or VDD MIN. 2.7 2.7 − − 300 3 − −30 UMA1021AM The device is designed to operate from 3 NiCd cells, in pocket phones, with low current and nominal 3 V supplies. The synthesizer operates at RF input frequencies up to 2.2 GHz with a fully programmable reference divider. All divider ratios are supplied via a 3-wire ser...