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| TDA5250D2 Datasheet, PDF (71/97 Pages) Infineon Technologies AG – ASK/FSK 868MHz Wireless Transceiver | |||
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confidential
TDA 5250 D2
preliminary
Applications
4.6.4 Peak Detector â Power Down Mode
For a safe and fast threshold value generation the peak detector is turned on
by the sequencer circuit (see Section 3.4.18) only after the entire receiving
path is active.
In the off state the output of the positive peak detector is tied down to GND and
the output of the negative peak detector is pulled up to VCC.
Logic
Power Down Mode
Data
Filter
+ Peak
Detector
off
- Peak
Detector
off
PDP
13
R1 100k SLC
14
R2 100k
PDN
12
Vcc
0V
CP
Vcc
CN
Vcc
Figure 4-29 Peak detector - power down mode
PKD_PWDN.wmff
Signal
Vcc
Neg. Peak Detector (pin12)
Data Signal
Threshold (pin14)
0
Power ON
Pos. Peak Detector (pin13)
Power Down
2,2ms
Power ON
Peak Detector Power ON
Figure 4-30 Power down mode
t
PkD_PWDN3.wmf
Wireless Components
4 - 31
Specification, July 2002
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