TDA5251F1 Datasheet, PDF (65/88 Pages) Infineon Technologies AG – ASK/FSK 315MHz Wireless Transceiver

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Logic
Power Down Mode
Data
Filter
+ Peak
Detector
off
- Peak
Detector
off
PDP
13
R1 100k _SLC
14
R2 100k
PDN
12
Vcc
0V
C_P
Vcc
C_N
Vcc
Figure 3-27 Peak detector - power down mode
Signal
Vcc
Neg. Peak Detector (pin12)
Data Signal
TDA5251 F1
Version 1.0
Application
PKD_PWDN.wmff
Threshold (pin14)
2,2ms
0
Pos. Peak Detector (pin13)
Power ON
Power Down
Power ON
Peak Detector Power ON
t
Figure 3-28 Power down mode
PkD_PWDN3.wmf
3.7
Data Valid Detection
In order to detect valid data two criteria must be fulfilled.
One criteria is the data rate, which can be set in register 06h and 07h. The other one is the received
RF power level, which can be set in register 08h in form of the RSSI threshold voltage. Thus for
using the data valid detection FSK modulation is recommended.
Preliminary Specification
65
2003-02-18