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參數(shù)資料
| 型號： | TDA5221 |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 英文描述： | ASK/FSK Single Conversion Receiver |
| 中文描述： | 詢價(jià)/ FSK信號單一轉(zhuǎn)換接收器 |
| 文件頁數(shù)： | 29/44頁 |
| 文件大?。?/td> | 705K |
| 代理商： | TDA5221 |
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Applications
4 - 9
TDA 5221
preliminary
Wireless Components
Target Specification, October 2001
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.
This offset voltage is generated by the bias current of the negative input of the
comparator (i.e. 20nA) running over the external resistor R. This voltage raises
the voltage appearing at pin 20 (e.g. 1mV with R = 100k
). In order to obtain
benefit of this asymmetrical offset for the demodulation of long zeros the lower
of the two FSK frequencies should be chosen in the transmitter as the zero-
symbol frequency.
In the following figure the shape of the above mentioned bandpass is shown.
frequenzgang.WMF
Figure 4-8
Frequency characterstic in case of FSK mode
The cutoff frequencies are calculated with the following formulas:
v
0dB
3dB
v-3dB
f
20dB/dec
-40dB/dec
f1
f2
f3
gain (pin19)
DC
0.18mV/kHz
2mV/kHz
C
k
R
k
R
f
+
=
330
330
2
1
1
π
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| TDA5221INCT-ND | 制造商:Infineon Technologies AG 功能描述: |
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| TDA5225 | 功能描述:射頻接收器 Multi-Ch Quad-Config Recvr w/Digi Slicer 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 |
| TDA5225XUMA1 | 制造商:Infineon Technologies AG 功能描述:ENHANCED SENSITIVITY MULTI-CHANNEL QUAD-CONFIGURATION RECEIVER WITH DIGITAL SLICER 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 RCVR ASK/FSK MULTI QD 28TSSOP |
| TDA5230 | 功能描述:射頻接收器 LW PWR ASK/FSK SNGL CONVERSN MULT-CHAN 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 |
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