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參數(shù)資料
| 型號： | MLX90109 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 125kHz RFID Integrated Transceiver |
| 中文描述： | 125KHz的RFID集成收發(fā)器 |
| 文件頁數(shù)： | 5/9頁 |
| 文件大?。?/td> | 143K |
| 代理商： | MLX90109 |
MLX90109
125kHz RFID Integrated Transceiver
MLX90109 Parallel Resonant transceiver
Page 5 of 9
Rev 1.4 19-Dec-00
Correction network
For a typical application, where 2kbaud date has to
be sent to a transponder using a Manchester or
Biphase encoding scheme, the most important
harmonics lie in a bandwidth between 400Hz and
3.6kHz.
As can be seen from the graphs below, the antenna
parameters can significantly reduce the available
bandwidth [FL, FH].
With a suitable correction network, the 3dB points
can be shifted to extend the possibilities.
Important system parameters are data rate, antenna
inductance (Lreader) and antenna quality factor
(Qreader).
In the time domain we optimize the shape of the
amplitude modulation on the reader antenna by
applying that correction network.
Calculation
In the graph below the transfer function of the
MLX90109 is given.
The first Zero (Fi) is determined the by the
MLX90109 and is typically 70Hz.
The Poles (FL and FH) are set by the Open loop
Gain (G=2mA/V) of the MLX90109 and the
Antenna Impedance Zant, which is system
dependent.
In
the
dependency of both poles on applied inductance
and for 2 quality factors are reflected. It is clear
that the bandwidth reduces significantly with
increase of Qreader.
Remark: Amax = G*Zant
graphs
below
the
A correction network with a single pole/zero couple
can increase the bandwidth by moving FH to FHH.
A more complex correction network with 2 pole/zero
couples can also improve the signal loss in case of
important low frequency harmonics (DC like signals).
In the Frequency domain this means FL is shifted
towards Fi
dB(Vampl/Vmodu)
f
i
f
L
f
H
A
max
MLX90109
Correction network with ... single pole/zero:
... double pole/zero:
MLX90109 + different correction networks
f
i
f
L
f
H
f
HH
f
i
f
L
f
H
f
HH
0
0
0
-A
max
A
max
Frequency Domain
Time Domain
F
H
-> F
HH
F
L
-> F
i
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MLX90109_06 | 制造商:MELEXIS 制造商全稱:Melexis Microelectronic Systems 功能描述:125kHz RFID Transceiver |
| MLX90109CDC-AAA-000-RE | 制造商:Melexis Semiconductors 功能描述:IC TXRX RFID 125KHZ 8SOIC 制造商:Melexis Semiconductors 功能描述:125 KHz RFID Transceiver |
| MLX90109CDC-AAA-000-TU | 制造商:Melexis Semiconductors 功能描述:IC TXRX RFID 125KHZ 8SOIC 制造商:Melexis Semiconductors 功能描述:125 KHz RFID Transceiver |
| MLX90109EDC-AAA-000-RE | 功能描述:IC RFID TXRX 125KHZ 8-SOIC RoHS:是 類別:RF/IF 和 RFID >> RFID IC 系列:MLX90121 其它有關(guān)文件:CR14 View All Specifications 標(biāo)準(zhǔn)包裝:1 系列:- RF 型:收發(fā)器 頻率:13.56MHz 特點(diǎn):ISO14443-B 封裝/外殼:16-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:16-SO 包裝:Digi-Reel® 其它名稱:497-5719-6 |
| MLX90109EDC-AAA-000-SP | 制造商:Melexis Semiconductors 功能描述:MLX90109 Series 3.1 to 5.5 V 125 kHz Surface Mount RFID Transceiver - SOIC-8 |
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