TDA5225 Datasheet, PDF (75/176 Pages) Infineon Technologies AG – Enhanced Sensitivity Multi-Channel Quad-Configuration Receiver

TDA5225
Functional Description
2.7.3 Definition of Power Level
The reference plane for the power level is the input of the receiver board. This means,
the power level at this point (P_r) is corrected for all offsets in the signal path (e.g.
attenuation of cables, power combiners etc.).
The specification value of power levels in terms of sensitivity is related to the peak power
of P_r in case of On-Off Keying (OOK). This is noted by the unit dBm peak.
Specification value of power levels is related to a Manchester encoded signal with a
Manchester duty cycle of 50% in case of ASK modulation.
An RF signal generator usually displays the level of the unmodulated carrier (P_carrier).
This has following consequences for the different modulation types:
Table 6
Power Level
Modulation
scheme
Realization with RF signal
generator
ASK
AM 100%
ASK
Pulse modulation (=OOK)
FSK
FM with deviation Δf:
f₁ = f_carrier - Δf
f₂ = f_carrier + Δf
Power level specification
value
P_r = P_carrier + 6dB
P_r = P_carrier
P_r = P_carrier
For power levels in sensitivity parameters given as average power, this is noted by the
unit dBm. Peak power can be calculated by adding 3 dB to the average power level in
case of ASK modulation and a Manchester duty cycle of 50%.
2.7.4 Symbols of SFR Registers and Control Bits
CONTROL
CONTROL
Figure 51 SFR Symbols
Symbolizes unique SFR registers or SFR control bit (s),
which are common for all configuration sets .
Symbolizes SFR registers or SFR control bit (s) with
Multi-Configuration capability (protocol specific).
In case of SFR register, the name starts with A _, B_, C_
or D_, depending on the selected configuration. This is
generally noted by the prefix „x _“.
Data Sheet
75
V1.0, 2010-02-19