TDA5212_06 INFINEON [Infineon Technologies AG], TDA5212_06 Datasheet - Page 28

• Manufacturer Part Number: TDA5212_06
• Description: ASK/FSK 915MHz Single Conversion Receiver
• Manufacturer: INFINEON [Infineon Technologies AG]

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 Figure 4-5. The time constant T
C integrator has to be significantly larger than the longest period of no signal
change T
please see Application Note „TDA521X_ANV1.1.“ chapter „4.11. Data Slicer“.
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
L
within the data sequence. For the calculation of the time constant T
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, December 2006
data out
25
Applications
TDA 5212
A
of the R-
Data_slice1.wmf
Data_slice2.wmf
A