The MLX90121 from Melexis is an ISO compliant 13,56 MHz RFID transceiver IC. Its main features include user-selectable modulation depth in write mode, while single subcarrier, FSK and PSK modulations are recognised in the read mode. The receiver is based on a diode envelope detector, followed by an IF filter and amplifier. A logarithmic amplifier is used for single subcarrier detection, ensuring fast and clean data recovery. The limiting output of the log amp is used for FSK and PSK recovery.
The transmitter uses a built-in open drain output transistor, which can provide up to 250 mW of RF power to a 50 Ω load with a 5 V power supply using the recommended matching network. This is suitable for most short- to mid-range applications. A simplified antenna and matching network can be used, at the expense of a reduced reading range, for example in handheld reader applications.
The chip is configured with a serial interface. A synchronisation signal is available when the majority voting is used. The part contains FSK (423/484 kHz) and PSK (847 kHz) decoders and a programmable encoder to facilitate data handling with a low-cost microcontroller. The encoder can be programmed with six different patterns. The chip can also be used as an analog frontend, in direct mode.
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