MLX90109 Datasheet, PDF (2/9 Pages) List of Unclassifed Manufacturers – 125kHz RFID Integrated Transceiver

MLX90109
125kHz RFID Integrated Transceiver
MLX90109 Electrical Specifications
DC Operating Parameters T_A = -40^oC to 85^oC, V_DD = 5V (unless otherwise specified)
General test conditions (see test set up blockdiagram) Creader= 21pF, Qreader=17, Lreader =75uH, Zant=1kOhm
T: 100% tested, C: guaranteed by Design & Characterization
Parameter
Symbol
Test Conditions
Min Typ Max Units
Supply Voltage
VDD
4.5 5 5.5 V T
Operating Resonance Freq. Fres
100
150 kHz C
Fres Temperature detuning
Quality factor Antenna
∆ ( T)Fres
Qant
See footnote ¹
-1
+1 % T
10
50
C
Antenna Impedance
Power down Current
Zant
IDDsleep
MODU = 5V
1
10 kΩ C
1 uA T
Max. Operating Current
Coil pin clamping Voltage
IDDmax
Vclamp
MODU = 1V, excluding antenna driver
current
Max Antenna Driver Current Idrivemax DC equivalent, See footnote ²
MODU power up current
Imodupor See footnote ³
MODU power down voltage Vmodupd See footnote ⁴
MODU minimum voltage Vmodumin See footnote ⁵
0.6
1.5 mA T
21
26 V T
5
8.5 mA C
60 uA C
4.2 4.35 4.5 V C
0.8
VC
Max. Antenna Voltage swing Vantmax MODU = 1V
8.0
8.6 Vpp T
Modulation depth
∆Vant
MODU switched between 0.5 and 1.5V, 1.4 2 2.6 V T
1 _{A minimum Quality factor is required in order for the reader to recover the transponder signal. The maximum}
quality factor is not limited, since the transponder signal is picked up even.
2 _{Antenna driver current is dimensioned, so as to guarantee that for Zant, within the specified range, the antenna}
driver can act as a perfect current source to drive the resonant circuit.
For a typical Zant~ωL*Q = 1kOhm (e.g. L= 67uH, Q=19), and MODU at 1V, MLX90109 will force 4V antenna
amplitude, therefore should supply 4mA current amplitude on the first harmonic sine wave.
Duty cycle is 50%, therefore the equivalent DC current consumption for such a system is 1.3mA.
3 _{Power up is realized by forcing a current into MODU through the external correction network. This will release}
an internal strap to VDD of the MODU pin.
4 _{The MLX90109 goes in power down mode when the MODU pin is brought to VDD.}
5 _{Voltages below Vmodumin, may cause the antenna Voltage to drop below VSS+0.3V. This will degrade the}
performance of the current driver. There is always a slight overshoot of the antenna voltage due to the antenna
resonance.
6 _{Since the modulation is realized by altering (∆duty )the duty cycle around the 50% value, the driver current}
setting influences directly the modulation depth, as Moddepth=Zant*Idrive*∆duty.
MLX90109 Parallel Resonant transceiver
Page 2 of 9
Rev 1.4 19-Dec-00