UMA1021 Datasheet | NXP Semiconductors

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 parator to implement a phase-locked loop. QUICK REFERENCE DATA SYMBOL VDD1, VDD2 VCC Itot Itot(pd) f RF fxtal fph(p) 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 parator 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 Ni Cd 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 serial programming bus. Separate power and ground pins are provided to the analog (charge pump) and digital circuits. The ground leads should be externally short-circuited to prevent large currents flowing across the die and thus causing damage. VDD1 and VDD2 must also be at the same potential (VDD). VCC must be equal to or greater than VDD for wider control range of the Voltage Controlled Oscillator (VCO), e.g. VDD = 3 V and VCC = 5 V. The charge pump current (phase detector gain) is fixed by an external resistor at pin ISET and controlled via the serial interface. Only a passive loop filter is necessary; the charge pump functions within a wide voltage pliance range to improve the overall system performance. TYP. - - 10 5 - - 200 - MAX. 5.5 5.5 - - 2200 35 - +85 UNIT V V m A µA MHz MHz k Hz °C...