XE1202AI027TRLF Semtech, XE1202AI027TRLF Datasheet - Page 13

• Manufacturer Part Number: XE1202AI027TRLF
• Description: Narrow Band 433/868/915MHz RF Transceiver
• Manufacturer: Semtech

4.1.5
The output power of the power amplifier is programmable on four values with the register “RTParam_Tpow” (see
the Configuration register section below), as shown in the table below, where RFOP values are given in Electrical
Specifications section.
The degree of filtering of the baseband data prior to the modulation of the LO carrier frequency is programmable
via the RTParam_Filter register:
This is illustrated in Figure 6, where DATAIN is the input bit stream to be transmitted:
© Semtech 2006
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the input bit stream is directly applied to the frequency synthesizer without any pre-filtering
(RTParam_Filter=0)
the input bit stream is pre-filtered before being applied to the frequency synthesizer; with this filtering, each
edge of the bit stream is linearly smoothed with a staircase transition (RTParam_Filter=1)
Transmitter
RTParam_FEI
RTParam_FEI
Demodulated
Demodulated
DataOut_FEI
DataOut_FEI
counter_out
counter_out
ffdemod_out
ffdemod_out
datain
datain
data
data
en
en
Figure 5: Timing diagram of an FEI measurement when “RTParam_Fsel” = 0
(the number of transitions on “counter_out” is for illustration only)
RTParam_Tpow
0
0
Table 8: output power settings
0 0
0 1
1 0
1 1
BIT B0
BIT B0
14
X
X
BIT B0+1
BIT B0+1
RFOP1
RFOP2
RFOP3
RFOP4
Output power
XE1202A TrueRF™
TS_FE
TS_FE
BIT B0+2
BIT B0+2
BIT B0+3
BIT B0+3
BIT B0+4
BIT B0+4
N
N
N
N
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