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參數(shù)資料
| 型號(hào)： | TDA5211 |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 英文描述： | ZENER,SML4744,15V,5%,1W |
| 中文描述： | 詢價(jià)/ FSK信號(hào)單一轉(zhuǎn)換接收器 |
| 文件頁數(shù)： | 28/52頁 |
| 文件大?。?/td> | 1469K |
| 代理商： | TDA5211 |
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Applications
4 - 8
TDA 5211
Wireless Components
Specification, May 2001
4.6
ASK/FSK Switch Functional Description
The TDA5211 is containing an ASK/FSK switch which can be controlled via
Pin 15 (MSEL). This switch is actually consisting of 2 operational amplifiers that
are having a gain of 1 in case of the ASK amplifier and a gain of 11 in case of
the FSK amplifier in order to achieve an appropriate demodulation gain charac-
teristic. In order to compensate for the DC-offset generated especially in case
of the FSK PLL demodulator there is a feedback connection between the
threshold voltage of the bit slicer comparator (Pin 20) to the negative input of
the FSK switch amplifier. This is shown in the following figure.
ask_fsk_datapath.WMF
Figure 4-7
ASK/FSK mode datapath
4.6.1
FSK Mode
The FSK datapath has a bandpass characterisitc due to the feedback shown
above (highpass) and the data filter (lowpass). The lower cutoff frequency f2 is
determined by the external RC-combination. The upper cutoff frequency f3 is
determined by the data filter bandwidth.
The demodulation gain of the FSK PLL demodulator is 140μV/kHz. This gain is
increased by the gain v of the FSK switch, which is 11. Therefore the resulting
dynamic gain of this circuit is 1.5mV/kHz within the bandpass. The gain for the
DC content of FSK signal remains at 140μV/kHz. The cutoff frequencies of the
bandpass have to be chosen such that the spectrum of the data signal is influ-
enced in an acceptable amount.
In case that the user data is containing long sequences of logical zeroes the
effect of the drift-off of the bit slicer threshold voltage can be lowered if the offset
voltage inherent at the negative input of the slicer comparator (Pin20) is used.
The comparator has no hysteresis built in.
R
1
=100k
R
2
=100k
v = 1
19
R
4
=30k
R
3
=300k
DATA Out
A
D
typ. 2 V
1.5 V......2.5 V
0.18 mV/kHz
FSK PLL Demodulator
RSSI (ASK signal)
C
1
R
ASK/FSK Switch
ASK
FSK
+
-
+
-
22
25
C
C
2
20
ASK mode : v=1
FSK mode : v=11
21
15
MSEL
FFB
OPP
SLP
SLN
Comp
-
+
Data Filter
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TDA5212 | ASK/FSK 915MHz Single Conversion Receiver |
| TDA5220 | ASK/FSK Single Conversion Receiver |
| TDA5221 | ASK/FSK Single Conversion Receiver |
| TDA5250 | ASK/FSK 868MHz Wireless Transceiver |
| TDA5250D2 | ASK/FSK 868MHz Wireless Transceiver |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TDA5211T | 制造商:Infineon Technologies AG 功能描述:315MHZ ASK/FSK SUPHET RCVR TSS |
| TDA5211XT | 制造商:Infineon Technologies AG 功能描述:RF Receiver ASK/FSK 5V 28-Pin TSSOP T/R |
| TDA5211XUMA1 | 制造商:Infineon Technologies AG 功能描述:RF Receiver ASK/FSK 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:IC FSK/ASK RECEIVER P-TSSOP-28 制造商:Infineon Technologies AG 功能描述:IC LP FSK/ASK SHR P-TSSOP-28 |
| TDA5212 | 功能描述:射頻接收器 CNTRL RF RECEIVER 928MHZ 5V 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 |
| TDA5212_06 | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:ASK/FSK 915MHz Single Conversion Receiver |
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