MLX90109 Datasheet, PDF (1/9 Pages) List of Unclassifed Manufacturers – 125kHz RFID Integrated Transceiver

MLX90109
125kHz RFID Integrated Transceiver
Features and Benefits
- Highly Integrated transmitter-receiver for 125kHz ASK transponders
- Parallel antenna gives factor of Qreader improved power efficiency over serial antenna
implementations
- Minimum reader PCB size with SO8 reader IC and minimum external components
- Integrated hardwired decoding for Biphase and Manchester ASK, 2kbit and 4kbit
transponders.
- Direct amplitude modulation on the reader antenna for downlink to transponder.
- Power down mode with Brown out protection
- Optimized system cost
- Fast design-in, ease of implementation.
Applications
Car Immobilizers, portable readers, battery powered door locks, house held appliances, …
Ordering Information
Part No.
MLX90109
Temperature Range
25^oC
-40^oC to 85^oC
Package
SO: 150mils 8pins SOIC
Production parts available Q1 2001
Functional Diagram
Description
VDD
VDD
Peak Det.
COIL
GND
Clock
Loop Gain+
Osc.
MODU
SC filt
MLX90109
Comparator
Digital
demod.
Dataout
Clockout
SPEED MODE
DATA
CLOCK
The MLX90109 is a single chip inductive RFID
transmitter-receiver for the 125kHz range. It has
been conceived for minimum system cost, and
minimum power consumption, whilst offering all
required flexibility for a state of the art AM Read-
Write base station.
An external L and C are connected as a parallel
resonant circuit, which will determine the carrier
frequency and the oscillator frequency of the
reader. This eliminates zero modulation effects,
and avoids the need for an external oscillator.
The antenna amplitude can be adjusted
externally on the fly. This allows straightforward
modulation of the antenna amplitude to write to
the transponder.
The reader IC can easily be switched to power
down by switching the antenna amplitude to
zero.
The MLX90109 can be configured to decode the
transponder signal on-chip. In this case the
decoded signal is available through a 2-wire
interface of clock and data. For minimum
interface wiring, the undecoded transponder
signal can also be made available on a single
wire interface.
MLX90109 Parallel Resonant transceiver
Page 1 of 9
Rev 1.4 19-Dec-00