MLX90109_06 Datasheet, PDF (2/15 Pages) Melexis Microelectronic Systems – 125kHz RFID Transceiver

MLX90109
125kHz RFID Transceiver
Table of Contents
1 Functional diagram .................................................................................................................................... 1
2 Description................................................................................................................................................. 1
3 Maximum ratings........................................................................................................................................ 3
4 Pad definitions and descriptions ................................................................................................................. 3
5 MLX90109 Electrical Specifications............................................................................................................ 4
6 Block Diagram ........................................................................................................................................... 5
7 General Description ................................................................................................................................... 5
7.1 Loop Gain Oscillator ............................................................................................................................ 5
7.2 Peak Detector...................................................................................................................................... 5
7.3 Band-Pass Filter.................................................................................................................................. 5
7.4 Digital demodulator.............................................................................................................................. 6
7.5 Antenna voltage definition.................................................................................................................... 6
7.6 Power Down mode .............................................................................................................................. 6
7.7 Write operation .................................................................................................................................... 6
8 System design parameters......................................................................................................................... 7
8.1 Auto start-up condition......................................................................................................................... 7
8.2 Antenna current ................................................................................................................................... 7
8.3 Antenna Impedance............................................................................................................................. 8
9 Typical configuration: READ ONLY ............................................................................................................ 9
9.1 Application diagram ............................................................................................................................. 9
9.2 Absolute minimum schematic .............................................................................................................. 9
9.3 Power consumption ........................................................................................................................... 10
9.4 Noise cancellation ............................................................................................................................. 10
9.5 Integrated decoding........................................................................................................................... 10
9.6 Close coupling................................................................................................................................... 10
10 Typical configuration: READ/WRITE ON/OFF keying (FDX-B100).......................................................... 11
10.1 Application diagram ......................................................................................................................... 11
11 Standard information regarding manufacturability of Melexis products with different soldering processes 12
12 ESD Precautions.................................................................................................................................... 12
13 FAQ....................................................................................................................................................... 13
13.1 Is it possible to make proportional modulation (depth less than 100%) with the MLX90109?............. 13
13.2 How should I read data information from a transponder up to 15cm? ............................................... 13
13.3 Is it possible to increase the output power of the MLX90109 transceiver?......................................... 13
13.4 Are there any specific coils available for the MLX90109 transceiver? ............................................... 13
13.5 What are the recommended pull-up values on DATA and CLOCK pins? .......................................... 13
14 Package Information .............................................................................................................................. 14
14.1 Plastic SO8...................................................................................................................................... 14
15 Disclaimer.............................................................................................................................................. 15
3901090109
Rev 008
Page 2 of 15
Data Sheet
Jun/06