General Description

The AS3990 UHF reader chip is an integrated analogue front end and data framing system for a 900MHz RFID reader system. Built in programming options make it suitable for a wide range of

applications in UHF RFID systems. Designed to simplify the design and implementation of an EPC

Class 1Gen2 reader, this IC requires only a standard 8Bit microcontroller with minimal other components.

Key Features

•  Fully compliant with ISO 18000 6a, 6b, 6c and EPC Class 1- Gen2 protocol using external MCU

•  EPC Class 1 -Gen2 framing support using low cost 8 Bit microcontroller

•  Direct data mode in the frequency range of 860 to 960 MHz enables propriety Protocol support

•  Internal power amplifier with level controlled 20dBm for short range applications

•  Modulator using ASK or PR-ASK modulation

•  Adjustable ASK modulation index

•  Automatic selection between I and Q Signal ensuring no “communication holes”

•  Built-in reception low-pass and high-pass filters having selectable corner frequencies.

•  On chip VCO and PLL covering complete RFID frequency range and frequency hopping support

•  Selectable receiver gain with AGC

•  Supported link frequencies from 40 up to 640kHz