TDA5225 Datasheet, PDF (46/176 Pages) Infineon Technologies AG – Enhanced Sensitivity Multi-Channel Quad-Configuration Receiver

TDA5225
Functional Description
Transparent Mode - Matched Filter (TMMF)
The received data after the Matched Filter (Two-Chip Matched Filter) with an additional
SIGN function is provided via the DATA_MATCHFIL signal (PPx pin). In this mode
sensitivity measurements with ideal data clock can be performed very simple. For further
details see the block diagram in Figure 15.
Sensitivity in this transparent mode is significantly depending on the implemented clock
and data recovery algorithm of the user software in the application controller.
TDA5225
data
interface
RX data
scheduler
Figure 23 Data interface for the Transparent Mode
Transparent Mode - Raw Data Slicer (TMRDS)
This mode supports processing of data even without bi-phase encoding (e.g. NRZ
encoding) by providing the received data via the One-Chip Matched Filter on the DATA
signal (PPx pin). See more details in the block diagram in Figure 15.
Sensitivity in this transparent mode is significantly depending on the implemented clock
and data recovery algorithm of the user software in the application controller.
The data interface can be seen from Figure 23.
Self Polling capabilities are possible as well, so Constant On-Off Mode and Wake-up on
RSSI can be used. See also example for Configuration B in Figure 24. The needed On
time (latency through TDA5225) is configured in the corresponding On time registers of
the chip. The interrupt for Wake-Up Config B (WUB) is enabled and suitable RSSI
thresholds are set.
If the RSSI signal is in a valid threshold area, the TDA5225 changes to Run Mode Self
Polling and an interrupt can be signaled to the Application Controller.
In case the RSSI signal is outside the valid threshold area, the chip stays in Self Polling
Mode and the external controller gets no interrupt (as the desired RSSI level is not
reached).
Data Sheet
46
V1.0, 2010-02-19