The MLX90109 125kHz RFID Integrated Transceiver is highly integrated for 125kHz ASK transponders. It has a parallel antenna, which improves the reader's power efficiency compared to serial antenna implementations. The PCB size is minimized with SO8 reader IC and minimum external components. The MLX90109 also has an integrated hardwired decoder for Biphase and Manchester ASK, 2kbit and 4kbit transponders. It allows for direct amplitude modulation on the reader antenna for downlink to transponder. The device has power down mode with brown out protection and optimized system cost. It is also easy to design and implement.
The MLX90109 is a highly integrated 125kHz RFID transmitter‑receiver designed for parallel antenna configurations, offering improved power efficiency and minimal external components. It supports Biphase and Manchester ASK decoding for 2kbit and 4kbit transponders and includes on‑chip modulation control.
The document covers features and benefits, detailed electrical specifications, pinout, filter settings, digital decoding, noise cancellation, correction network design, bandwidth graphs, application information, unique features, cross‑reference data, absolute maximum ratings, and a FAQ section.
| Supply Voltage (VDD) Min | 4.5 V |
|---|---|
| Supply Voltage (VDD) Typ | 5 V |
| Supply Voltage (VDD) Max | 5.5 V |
| Operating Resonance Frequency (Fres) Min | 100 kHz |
| Operating Resonance Frequency (Fres) Typ | 150 kHz |
| Antenna Impedance (Zant) Min | 1 kΩ |
| Antenna Impedance (Zant) Typ | 10 kΩ |
| Coil Pin Clamping Voltage (Vclamp) | 21 – 26 V |
No, the MLX90109 does not affect the antenna resonance frequency; spread and temperature drift are determined only by the discrete antenna components.
Yes, the device is insensitive to DC magnetic levels.
Power‑down mode is entered by setting the MODU pin to VDD, which causes the antenna voltage to fade and stops oscillations.
The SPEED pin selects filter characteristics: set to VDD for 4 kbaud operation or to GND for 2 kbaud operation.