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): 61/88頁
文件大?。?/td> 2086K
代理商: TDA5251F1
TDA5251 F1
Version 1.0
Application
Preliminary Specification
61
2003-02-18
Confidential
RSSI.wmf
Figure 3-22
Typ. RSSI Level (Eval Board) @3V
3.6
Data Slicer - Slicing Level
The data slicer is an analog-to-digital converter. It is necessary to generate a threshold value for the
negative comparator input (data slicer). The TDA5251 offers an RC integrator and a peak detector
which can be selected via logic. Independent of the choice, the peak detector outputs are always
active.
3.6.1
RC Integrator
Necessary external component (
Pin14
): C
SLC
This integrator generates the mean value of the data filter output. For a stable threshold value, the
cut-off frequency has to be lower than the lowest signal frequency. The cutoff frequency results from
the internal resistance R=100k and the external capacitor C
SLC
on
Pin14
.
Cut-off frequency:
Component calculation: (rule of thumb)
T
L
– longest period of no signal change
Table 3-12
Bit
D15
Sub Address 00H: CONFIG
Function
SLICER
Description
0= LP, 1= Peak Detector
Default
0
SET
0
ADC
0
100
200
300
400
500
600
700
800
900
1000
1100
1200
1300
-120
-110
-100
-90
-80
-70
-60
-50
-40
-30
-20
RF /dBm
R
high gain
low gain
Signal
SLC
off
cut
f
Min
C
k
f
100
2
1
[3 – 30]
k
T
C
L
SLC
100
3
[3 – 31]
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