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參數(shù)資料
| 型號： | TDA5251F1 |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 英文描述： | ASK/FSK 315MHz Wireless Transceiver |
| 中文描述： | 詢價/ FSK信號315MHz的無線收發(fā)器 |
| 文件頁數(shù)： | 40/88頁 |
| 文件大小： | 2086K |
| 代理商： | TDA5251F1 |
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TDA5251 F1
Version 1.0
Application
Preliminary Specification
40
2003-02-18
Confidential
The noise figure of the LNA-input-matching network is equal to its losses. The input matching
network is always a compromise of sensitivity and selectivity. The loaded Q should not get too high
because of 2 reasons:
more losses in the matching network and hence less sensitivity
tolerances of components affect matching too much. This will cause problems in a tuning-free mass
production of the application. A good CAE-tool will help to see the effects of component tolerances
on the input matching more accurate by tweaking each value.
A very high selectivity can be reached by using SAW-filters at the expense of higher cost and lower
sensitivity which will be reduced by the losses of the SAW-Filter of approx. 4dB.
Image-suppression:
Due to the quite high 1
st
-IF of the frontend, the image frequency is quite far away. The image
frequency of the receiver is at:
The image suppression on the evalboard is about 12dB.
LO-leakage:
The LO of the 1
st
Mixer is at:
The LO-leakage of the evalboard on the RF-input is about –102dBm.
3.1.3
Switch in TX-Mode
The evalboard can be set into the TX-Mode by grounding the RX/TX-jumper on the evalboard or
programming the TDA5251 to operate in the TX-Mode. If the IC is programmed to operate in the
TX-Mode, the RX/TX-pin will act as an open drain output at a logical LOW. Then a DC-current can
flow from VCC to GND via L1, L2, D1, R1 and D2.
Now both pin-diodes are biased with a current of approx. 0.3mA@3V and have a very low
impedance for RF.
MHz
MHz
IF
f
SIGNAL
f
IMAGE
f
525
105
*
2
315
*
2
[3 – 5]
[3 – 6]
MHz
MHz
RECEIVE
f
LO
f
420
3
4
*
315
3
4
*
1
,
*
2
R
DIODE
PIN
FORWARD
V
CC
V
DIODE
PIN
I
[3 – 7]
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相關代理商/技術參數(shù) |
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|---|---|
| TDA5251F1_07 | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:ASK/FSK 315MHz Wireless Transceiver |
| TDA5251XUMA1 | 制造商:Infineon Technologies AG 功能描述:RF Transceiver ASK/FSK 2.5V/3.3V/5V T/R 制造商:Infineon Technologies AG 功能描述:CONTROL - Tape and Reel 制造商:Infineon Technologies AG 功能描述:TXRX FSK/ASK SGL LP TSSOP-38 |
| TDA5252 | 功能描述:射頻接收器 ASK/FSK WIRELESS TRANSCEIVER RoHS:否 制造商:Skyworks Solutions, Inc. 類型:GPS Receiver 封裝 / 箱體:QFN-24 工作頻率:4.092 MHz 工作電源電壓:3.3 V 封裝:Reel |
| TDA5252G2 | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:ASK/FSK 915MHz Wireless Transceiver |
| TDA5252XUMA1 | 制造商:Infineon Technologies AG 功能描述:RF Transceiver ASK/FSK 2.5V/3.3V/5V 38-Pin TSSOP T/R 制造商:Infineon Technologies AG 功能描述:CONTROL - Tape and Reel 制造商:Infineon Technologies AG 功能描述:TXRX FSK/ASK SGL LP TSSOP-38 |
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