TDA5252G2 Datasheet, PDF (63/86 Pages) Infineon Technologies AG – ASK/FSK 915MHz Wireless Transceiver

TDA5252 G2
Version 1.1
Application
Signal
Signal
τ_posPkD
Pos. Peak Detector (pin13)
Threshold SLC(pin14)
τ _negPkD
Neg. Peak Detector (pin12)
Figure 3-24 Peak Detector timing
Component calculation: (rule of thumb)
t
PkD_timing.wmf
C _p ≥ ^{2 ⋅ TL1}
100kΩ
C _n ≥ ^{2 ⋅ TL2}
100kΩ
T_L1 – longest period of no signal change (LOW signal)
[3 – 34]
T_L2 – longest period of no signal change (HIGH signal) [3 – 35]
3.6.3 Peak Detector - Analog output signal
The TDA5255 data output can be digital (pin 28) or in analog form by using the peak detector output
and changing some settings.
To get an analog data output the slicer must be set to lowpass mode (Reg. 0, D15 = LP = 0) and
the peak detector capacitor at pin 12 or 13 has to be changed to a resistor of about 47kOhm.
Data Sheet
63
2007-02-26