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參數(shù)資料
| 型號(hào)： | 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(yè)數(shù)： | 7/9頁(yè) |
| 文件大?。?/td> | 143K |
| 代理商： | MLX90109 |
MLX90109
125kHz RFID Integrated Transceiver
MLX90109 Parallel Resonant transceiver
Page 7 of 9
Rev 1.4 19-Dec-00
Applications Information
MLX90109 Read/Write demokit:
Above schematic is used in a demokit which
allows to
read and write
the MLX90111 with 2cm diameter aircoils
at 2 and 4kbaud, using Manchester and
Biphase encoding
up to 7cm
whilst consuming only 5mA, inlcuding antenna
current.
An Atmel microcontroller (AT90S8515) was used
to have enough ports to drive a ledbar.
Antenna parameters:
- Lr= 89uH, Cr= 18nF
- Qr=30
- Rpar= Optional parallel resistance
Coil design considerations
Let's start from an operation frequency of 120
kHz. In order for the antenna not to get detuned
by stray capacitance to ground, it is good not to
have a high L value. In this way C is big and the
detuning is minimal.
The field of the coil is proportional to the number
of windings and to the current flowing through it:
H ~ N.I = N.V/(
ω
.L)
with V the ac voltage across the coil, and
ω
.L
the impedance of the coil.
Furthermore the inductance of the coil is
proportional to the square of the number of
windings.
L = Lo*N
2
With Lo the inductance of 1 turn.
So
H ~ V/(
ω
.Lo.N)
Reducing the number of turns on the coil is good
for improving the field strength as well as for
making the construction of the coil easier.
Antenna impedance specification is determined
by the current that the antenna driver can
supply. Outside the specification, the feedback
loop will not operate as designed for, and
functionality will deteriorate drastically.
Zant = Zr // Rpar with Zr = Lr/(Rl*Cr)
VDD
C
D
=100nF
1
8
7
6
5
2
3
4
1
1
Rr, Lr, Cr
uctrl
DataIN
ClockIN
C1=47nF
C2=68nF
1
4
39k
MODE
SPEED
VDD
Read/
Write
M
9
uctrl
Rpar
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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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