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XE1205
5.3
TRANSMITTE R SECTION
The XE1205 is set to transmit mode when MCParam_Select_mode is low by setting MCParam_Chip_mode(1:0) to “10”.
If MCParam _Select_mode is high the XE1205 is set to transmit mode by setting pins SW(1:0) to “10”.
Th e data directly modulates the LO, or an (optional) pulse shaping filter can be used resulting in an adjacent channel
power down to -37dBm at 25kHz for an output power up to 10dBm.
In continuous mode the transmitted data is sent directly to the frequency synthesizer.
In buffered mode the data is first written into the sixteen byte FIFO via the SPI interface; data from the FIFO is used to
m odulate the frequency synthesizer.
5.3.1
Output power
The output power of the power amplif ier is programmable on four values with the register TXParam_Power (please refer
to section 7.2.4 below), as shown in Table 10, where RFOP values are given in the Electrical Specifications section
4.2.2.
TXParam_POWER
00
01
10
11
Output power
RFOP1
RFOP2
RFOP3
RFOP4
T able 10: Output power settings
5.3.2
Transmitter in continuous mode
The transmitter works in continuous mode if the bit MCParam_Buffered_ mode is low. The transmit data should be
applied to pin DATA if register bit Data_ unidir is low or pin NSS_DATA if reg ister bit Data_unidir is high. Figure 11 shows
the transmitter chain in continuous mode:
MCParam_Data_unidir
0
0
DATA
modulator
1
Data shaping
filter
datain
1
NSS_DATA
TXParam_Filter
IRQ_1
Figure 11: Transmitter data path in continuous mode
The pulse shaping function is enabled by setting TXParam_Filter to ‘1’. If the filtering option is selected, the DCLK signal
is used as data clock in the transmi ssion and this clock is generated at a frequency according to the selected bit rate.
The DCLK signal is supplied to the mi crocontroller via the pin IRQ_1 which must update th e data on the falling edge. The
d ata is sampled at the rising edge of DCLK and filtered.
Figure 12 shows an example of filtered data for a bit rate of 4.8kbit/s and a frequency deviation of 5 kHz:
? Semtech 2008
18
www.semtech.com
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