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MLX90109 Datasheet

  • MLX90109

  • 125kHz RFID Integrated Transceiver

  • 145.02KB

  • 9頁

  • ETC

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MLX90109
125kHz RFID Integrated Transceiver
Features and Benefits
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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, 鈥?/div>
Ordering Information
Part No.
MLX90109
Temperature Range
o
25 C
-40
o
C to 85
o
C
Package
SO: 150mils 8pins SOIC
Production parts available Q1 2001
Functional Diagram
Description
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.
DATA
The antenna amplitude can be adjusted
CLOCK
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.
VDD
VDD
Peak Det.
Clock
Loop Gain+
Osc.
GND
MODU
SPEED
Digital
demod.
SC filt
MLX90109
Comparator
COIL
Dataout
Clockout
MODE
MLX90109 Parallel Resonant transceiver
Page 1 of 9
Rev 1.4 19-Dec-00

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