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參數(shù)資料
| 型號(hào)： | 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(hào)單一轉(zhuǎn)換接收器 |
| 文件頁(yè)數(shù)： | 33/44頁(yè) |
| 文件大?。?/td> | 705K |
| 代理商： | TDA5221 |
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Applications
4 - 13
TDA 5221
preliminary
Wireless Components
Target Specification, October 2001
e-Fkt2.WMF
Figure 4-12
Voltage transient on capacitor C attached to pin 20
As an example the choice of C2 = 22nF and C = 47nF yields
τ
2
= 0.44ms
T
2
= 0.71ms
T
3
= 0.53ms
This means that in this case the inrush current could flow for a duration of
0.64ms but stops already after 0.49ms when the U
Smax
limit has been reached.
T3 should always be chosen to be shorter than T2.
It has to be noted finally that during the turn-on duration T2 the overall device
power consumption is increased by the 220μA needed to charge C.
The precharge circuit may be disabled if C2 is not equipped. This yields a T2
close to zero. Note that the sum of R4 and R5 has to be 600k
in order to pro-
duce 3V at the THRES pin as this voltage is internally used also as the refer-
ence for the FSK demodulator.
Us
T3
Uc
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| 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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