MLX90121

13.56MHz RFID Transceiver

3901090121

Page 1 of 26

Data Sheet

Rev. 007

Jan-2008

Features and Benefits

Conforms with ISO14443A

(1)(3)

Conforms with ISO14443B

(2)

Confroms with ISO15693

(3)

Programmable encoder and decoder

Low external component count

Applications

Portable data terminals

Access control readers

Contact-less payment terminals

Smart label printer

(1).Purchase of MLX90121s doesn’t imply any grant of any ISO14443A license. Customers are advised to sign patent licensing

agreements with all third parties, especially those companies listed in the introduction of the corresponding standard.

(2) RATP / Innovatron Technology

(3) Conformance with ISO/IEC15693 “long distance mode” (6.6kb/s ASK) and ISO/IEC14443A is limited to a temperature range from

O°C to 85°C.

Ordering Information

Part No.

Temperature Suffix

Package Code

Option code

MLX90121

C (0°C to 70°C)

FR (Lead free SSOP20, 20 9 mils)

--

MLX90121

E (-40°C to 85°C)

FR (Lead free SSOP20, 2 09 mils)

--

1. Functional Diagram

Microcontroller

MLX90121

Serial data

interface

TX

RX

Impedance

matching

Attenuation

resistor

Analog

functions

Digital

functions

2. Description

The MLX90121 is an ISO compliant 13.56MHz

RFID transceiver integrated circuit.

The main features include user selectable

modulation depth in write mode, whereas single

sub-carrier ASK, FSK and PSK modulations are

recognized in the read mode.

The receiver is based on a diode envelope

detector, followed by an IF filter and amplifier. A

logarithmic amplifier is used for single sub-

carrier ASK detection, ensuring fast and clean

data recovery. The limiting output of the log amp

is used for FSK and PSK recovery.

The transmitter uses a built in open drain output

transistor, which can provide up to 250 miliwatts

of RF power to a 50 ohms load with a 5 volts

power supply using the recommended matching

network. This is suitable for most short to mid

range applications. A simplified antenna and

matching network can be used, at the expense

of a reduced reading range, for example in

hand-held reader applications.

The chip is configured with a serial interface. A

synchronization signal is available when the

majority voting is used.

Digital part contains ASK, FSK (423 / 484kHz)

and

PSK

(847kHz)

decoders

and

a

programmable

encoder

to

facilitate

data

handling with a low cost microcontroller. The

encoder can be programmed with 6 different

patterns.

The chip can also be used as an analog front-

end, in direct mode.