參數(shù)資料
型號(hào)： TDA5251F1
廠商： INFINEON TECHNOLOGIES AG
英文描述： ASK/FSK 315MHz Wireless Transceiver
中文描述： 詢價(jià)/ FSK信號(hào)315MHz的無(wú)線收發(fā)器
文件頁(yè)數(shù)： 67/88頁(yè)
文件大?。?/td> 2086K
代理商： TDA5251F1
TDA5251 F1
Version 1.0
Application
Preliminary Specification
67
2003-02-18
Confidential
3.7.1
Frequency Window for Data Rate Detection
The high time of data is used to measure the frequency of the data signal. For Manchester coding
either the data frequency or half of the data frequency have to be detected corresponding to one
high time or twice the high time of data signal.
A time period of 3*2*T is necessary to decide about valid or invalid data.
window_count_timing.wmf
Figure 3-31
Window Counter timing
Example to calculate the thresholds for a given data rate:
- Data signal manchester coded
- Data Rate: 2kbit//s
- f
clk
= 13,125 MHz
Then the period equals to
respectively the high time is 0,25ms.
We set the thresholds to +-10% and get: T1= 0,225ms and T2= 0,275ms
The thresholds TH1 and TH2 are calculated with following formulas
t
0
0
1
0
T
2*T
DATA
possible
GATE 1
possible
GATE 2
0
1
T1
2*T1
T2
2*T2
0
t
t
0,5ms
2kbit/s
1
T
2
[3 – 36]
4
f
T1
TH1
clk
[3 – 37]
4
f
T2
TH2
clk
[3 – 38]
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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
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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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