TDA5204E1 Infineon Technologies, TDA5204E1 Datasheet - Page 26

• Manufacturer Part Number: TDA5204E1
• Description: ASK Single Conversion Receiver 390MHz
• Manufacturer: Infineon Technologies

Wireless Components
4.5 Data Slicer Threshold Generation
The threshold of the data slicer can be generated in two ways, depending on
the signal coding scheme used. In case of a signal coding scheme without DC
content such as Manchester coding the threshold can be generated using an
external R-C integrator as shown in the following . 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 20k Ω .
Figure 4-5
Another possibility for threshold generation is to use the peak detector in con-
nection 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.
Figure 4-6
Data Slicer Threshold Generation with External R-C Integrator
Data Slicer Threshold Generation Utilising the Peak Detector
data
filter
data
filter
Pins:
peak detector
4 - 7
Pins:
19
C
26
R
R
R
19
20
U
threshold
20
data slicer
U
threshold
data slicer
C
data out
25
Specification, January 2001
data out
25
TDA 5204 E1
Applications
preliminary
Data_slice1.wmf
Data_slice2.wmf