TDA5210 Datasheet, PDF (28/53 Pages) Infineon Technologies AG – ASK/FSK Single Conversion Receiver

TDA 5210
Applications
4.5 Data Slicer Threshold Generation
The threshold of the data slicer can be generated using an external R-C inte-
grator as shown in Figure 4-5. The cut-off frequency of the R-C integrator has
to be lower than the lowest frequency appearing in the data signal. In order to
keep distortion low, the minimum value for R is 20kΩ.
R
C
Pins: 19
data
filter
20
U_threshold
data out
25
data slicer
Figure 4-5
Data_slice1.wmf
Data Slicer Threshold Generation with External R-C Integrator
In case of ASK operation another possibility for threshold generation is to use
the peak detector in connection with two resistors and one capacitor as shown
in the following figure. The component values are depending on the coding
scheme and the protocol used.
R
C
R
Pins: ₂₆ 19
peak detector
20
U_threshold
data out
25
data slicer
data
filter
Figure 4-6
Data_slice2.wmf
Data Slicer Threshold Generation Utilising the Peak Detector
Wireless Components
4-7
Specification, May 2001