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UMA1021 - Low-voltage frequency synthesizer for radio telephones

General Description

The UMA1021AM BICMOS device integrates a prescaler, programmable dividers, and a phase comparator to implement a phase-locked loop.

Key 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.

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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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.