TDA5250D2 Datasheet, PDF (69/97 Pages) Infineon Technologies AG – ASK/FSK 868MHz Wireless Transceiver

confidential
TDA 5250 D2
preliminary
Applications
4.6.2 Peak Detectors
Table 4-13 Sub Address 00H: CONFIG
Bit Function
Description
Default
SET
D15 SLICER
0= LP, 1= Peak Detector
0
1
The TDA5250 has two peak detectors built in, one for positive peaks in the
data stream and the other for the negative ones.
Necessary external components:
- Pin12: C_N
- Pin13: C_P
Data
Filter
DataSlicer
+
-
Slicer Threshold
Contr.
Logic
DATA
28
+ Peak
Detector
Signal
100k
R
- Peak
Detector
PDP
13
R1 100k
SLC
14
R2 100k
PDN
12
C_P
Vcc
C_N
Vcc
Figure 4-26 Slicer Level using Peak Detector
SLC_PkD.wmf
For applications requiring fast attack and slow release from the threshold value
it is reasonable to use the peak detectors. The threshold value is generated by
an internal voltage divider. The release time is defined by the internal resist-
ance values and the external capacitors.
τ _posPkD = 100 k Ω ⋅ C _p
[4 – 32]
τ _negPkD = 100 k Ω ⋅ C _n
[4 – 33]
Wireless Components
4 - 29
Specification, July 2002