tda5225 Infineon Technologies Corporation, tda5225 Datasheet - Page 38

• Manufacturer Part Number: tda5225
• Description: Enhanced Sensitivity Multi-channel Quad-conf Igurat Ion Receiver With Digital Slicer
• Manufacturer: Infineon Technologies Corporation

Figure 17
Threshold evaluation procedure
A statistical noise floor evaluation using read register RSSIPMF (RMS operation) leads
to the threshold x_WURSSITHy. The interferer thresholds x_WURSSIBLy and
x_WURSSIBHy are disabled when they are set to their default values.
For evaluation of the interferer thresholds, either use register RSSIPMF for RMS
operation or during SPM and WU (Wake-Up) on RSSI use register RSSIPWU to
statistically evaluate the interferer band. Finally the thresholds x_WURSSIBLy and
x_WURSSIBHy can be set. Further details can be seen in
RSSI Peak Detector
NOTE: If e.g. an interferer ends/starts too close after/to the beginning/end of the
observation time, then a decision level error can arise. This is due to the filter dynamics
(settling time). Further, for interferer thresholds evaluation in SPM this changes interferer
statistics. Several interferer measurements are recommended to suppress this, what
makes sense anyway for a better distribution.
Data Sheet
RSSI Blocking Thresholds
and
Chapter 2.6.2.2 Constant On-Off Time
wanted signal
wanted signal
noise floor
interferer
38
x_WURSSIBHy
x_WURSSITHy
x_WURSSIBLy
Figure
Functional Description
(COO).
10,
V1.0, 2010-02-19
Chapter 2.4.7
TDA5225