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.