TDA5255E1 Datasheet, PDF (64/93 Pages) Infineon Technologies AG – ASK/FSK 434MHz Wireless Transceiver

Confidential
TDA5255 E1
Version 1.1
Application
DataSlicer
+
-
Slicer Threshold
Contr.
Logic
DATA
28
+ Peak
Detector
Data
Filter
Signal
100k
R
- Peak
Detector
PDP
13
R1 100k
SLC
14
R2 100k
PDN
12
C_P
Vcc
C_N
Vcc
SLC_PkD.wmf
Figure 3-26 Slicer Level using Peak Detector
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 resistance values and the external capacitors.
t _posPkD = 100 k W × C _p
[3 – 32]
Signal
t _negPkD = 100 k W × C _n
[3 – 33]
Signal
t_posPkD
Pos. Peak Detector (pin13)
negPkD
Figure 3-27 Peak Detector timing
Preliminary Specification
64
Threshold SLC(pin14)
Neg. Peak Detector (pin12)
t
PkD_timing.wmf
2002-11-28