GENERAL DESCRIPTION

The UMA1016xT is a low power synthesizer for radio communications. Manufactured in bipolar technology, it is designed for a 70 to 1000 kHz channel spacing in the 500 to 1000 MHz band. The channel is programmed via a 3-wire serial bus. The internal dual register architecture allows a single synthesizer to be used in TDD systems. Fast switching between transmit and receive frequencies is achieved without the need for bus overhead. It also incorporates a sensitive, low power RF divider and a dead-zone-eliminated 3-state phase comparator. A power-down mode enables the circuit to be idled.

FEATURES

• RF input frequencies to 1 GHz

• Fully programmable RF divider

• 3-wire serial bus interface

• On-chip 3 to 16 MHz crystal oscillator

• Mask programmable ÷2 to ÷31 reference divider ratio

• Up to 1 MHz channel spacing

• Crystal frequency buffered output

• Dual register architecture for fast Tx/Rx switching in TDD single synthesizer systems

• Phase detector compensated for supply and temperature variations

• Power-down mode.

APPLICATIONS

• 900 MHz cordless telephones

• Portable battery-powered radio equipment.