UAA2082H

Advanced pager receiver

GENERAL DESCRIPTION

The UAA2082 is a high-performance low-power radio receiver circuit primarily intended for VHF, UHF and 900 MHz pager receivers for wide area digital paging systems, employing direct FM non-return-to-zero NRZ frequency shift keying FSK.

The receiver design is based on the direct conversion principle where the input signal is mixed directly down to the baseband by a local oscillator on the signal frequency. Two complete signal paths with signals of 90° phase difference are required to demodulate the signal.

All channel selectivity is provided by the built-in IF filters. The circuit makes extensive use of on-chip capacitors to minimize the number of external components.

The battery monitoring circuit has an external sense input and a 1.1 V detection threshold for easy operation in a single-cell supply concept.

The UAA2082 was designed to operate together with the PCA5000A, PCF5001 or PCD5003 POCSAG decoders, which contain a digital input filter for optimum call success rate.

FEATURES

• Wide frequency range: VHF, UHF and 900 MHz bands

• High sensitivity

• High dynamic range

• Electronically adjustable filters on chip

• Suitable for data rates up to 2400 bits/s

• Wide frequency offset and deviation range

• Fully POCSAG compatible FSK receiver

• Power on/off mode selectable by the chip enable input

• Low supply voltage; low power consumption

• 1-cell battery-low detection circuit

• High integration level

• Interfaces directly to the PCA5000A, PCF5001 and PCD5003 POCSAG decoders.

APPLICATIONS

• Wide area paging

• On-site paging

• Telemetry

• RF security systems

• Low bit-rate wireless data links.