MLX90109CDC-AAA-000-RE Datasheet MLX90109EDC-AAA-000-RE, MLX90109CDC-AAA-000-SP, MLX90109EDC-AAA-000-TU | P4-P6

3901090109

Rev 011

3 Maximum ratings

Supply voltage (V

with respect to V

)

Input voltage on any pin (except COIL, DATA and CLOCK)

Input voltage on COIL, DATA and CLOCK

Maximum junction temperature

Table 1: Absolute maximum ratings

Exceeding the absolute maximum ratings may cause permanent damage. Exposure to absolute

rated condition

s for extended periods may affect device reliability.

Pad definitions and descriptions

Pad Name Function

COIL Oscillator output

Ground

SPEED Data rate selection :

2kbaud

MODU

Input for amplitude setting

MODE

Decoding mode selection

CLOCK

Clock output of decoder

DATA

Data output of decoder

Power Supply

Table 2: Pin description MLX90109

MLX90109

125kHz RFID Transceiver

Page 4 of 16

Symbol

Condition

Min Max

DC -0.3 6

Input voltage on any pin (except COIL, DATA and CLOCK)

-0.3 V

+0.3

clamp

-0.3 15

150

Exceeding the absolute maximum ratings may cause permanent damage. Exposure to absolute

s for extended periods may affect device reliability.

Pad definitions and descriptions

2kbaud

or 4kbaud

Input for amplitude setting

Decoding mode selection

: Biphase or Manchester

Clock output of decoder

Data output of decoder

Plastic SO8

MLX90109

125kHz RFID Transceiver

Data Sheet

Jun/12

Unit

Volts

+0.3

Volts

ºC

Exceeding the absolute maximum ratings may cause permanent damage. Exposure to absolute

-maximum-

MLX90109

125kHz RFID Transceiver

3901090109 Page 5 of 16 Data Sheet

Rev 011 Jun/12

5 MLX90109 Electrical Specifications

DC Operating Parameters T

= -40

C to 85

C, F

res

= 125kHz, V

= 3.1 to 5.5V

Antenna parameters: L

ant

= 73.6uH, Q

ant

=17.3Ω, Z

ant

=1kΩ

Parameter.

Symbol Test Conditions Min Typ Max Units

Supply Voltage V

3.1 5.5 V

Resonance Frequency F

res

(Depends on the resonance

frequency of the antenna)

100 125 150 kHz

Frequency drift with temperature

∆ F

res

(T)

res

= 125 kHz -1 +1 %

Sensitivity

(note 1)

sens

(Depends on the application)

10 30 mV

Amplitude Offset

(note 2)

0 0.15 0.35 V

Power down voltage

(on MODU pin)

=5V

=3.1V

4.0

2.2

4.9

3.0

Power up voltage

(on MODU pin)

=5V

=3.1V

3.2

1.3

4.3

2.4

Power down Current I

DD,pn

MODU

= V

0 1.5

µA

Supply Current (excluding

antenna supply current)

(note 3)

=5V, V

MODU

= 0.8V 1.8 3.0 mA

Antenna supply current

(note 4)

DD,ant

(Depends on the application) 2.8 mA

Leakage current on pins COIL,

MODE, SPEED, MODE, DATA

leak

(Power down) 1.0

µA

Output voltage DATA and

CLOCK pin

Pull-up resistance R

> 2kΩ

0.4 V

Table 3: Electrical specifications

Note 1: The sensitivity is defined as the minimum

amplitude of the 2kHz- modulation, generated by the

transponder, demodulated and decoded by the reader.

This parameter depends on the application:

• the value of V

• the antenna

• the code sent to the reader

Note 2: The antenna amplitude voltage is:

Vant = V

– V

MODU

+ V

Note 3: The supply current of the device depends on the

antenna drive current I

DD,ant

Typically: I

≈ 1.3 mA + I

DD,ant

/ 6.3

Note 4: The antenna supply current (called I

DD,ant

) is the

equivalent DC supply current driven by the chip through

the antenna.

MLX90109

125kHz RFID Transceiver

3901090109 Page 6 of 16 Data Sheet

Rev 011 Jun/12

6 Block Diagram

7 General Description

7.1 Loop Gain Oscillator

The oscillator frequency is locked on the antenna resonance frequency. The clock is derived from the

oscillator. In this way, its characteristics are locked to the transmission frequency. As the antenna is used to

determine the carrier frequency, the antenna is always perfectly tuned to resonance. Consequently the

MLX90109 is not sensitive to zero modulation (the so-called “zero modulation” is the phenomena whereby

the tag does modulate properly, but no amplitude modulation can be observed at the reader coil).

7.2 Peak Detector

The peak detector of the transceiver detects the AM signal generated by the tag. This signal is filtered and

amplified by an on-chip switched capacitor filter before feeding the digital decoder. The same signal is fed

back to close the loop of the antenna voltage.

7.3 Band-Pass Filter

By setting the SPEED pin to V

or to GND, the filtering characteristics are optimized for either 2 or 4 kbaud.

The MLX90109 makes an internal first-order filtering of the envelope that changes according to the setting of

the SPEED pin, to fit the Biphase and Manchester data spectrum:

2kbaud (speed pin to V

) : 400Hz to 3.6kHz

4kbaud (speed pin to V

) : 800Hz to 7.2kHz

P1-P3 P4-P6 P7-P9 P10-P12 P13-P15 P16-P16

MLX90109CDC-AAA-000-RE

Mfr. #:

Buy MLX90109CDC-AAA-000-RE

Manufacturer:

Melexis

Description:

RFID Transponders 125 kHz RFID Reader IC

Lifecycle:

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MLX90109CDC-AAA-000-RE

MLX90109CDC-AAA-000-RE

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