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XE1203F
Figure 10: Data exchange during reception mode with Barker the feature enabled
When using the Barker encoding in transmitter mode, the RTParam_Barker parameter is set to “1” and the
baseband data at 1154 bit/s is applied through either the DATA or DATAIN depending to the status of
ADParam_disable_data_bidir. The data is spread into an encoded chip stream at 12.7 kcps by the Barker encoder.
This chip stream is directly applied to the frequency synthesizer without any pre-filtering.
When using the Barker coder/decoder feature in transmission mode, the DCLK pin is used to synchronize the data
coming from a microcontroller or another source. This DCLK clock is generated by the XE1203F. At the falling
edge of the each clock a new data bit (on DATA or DATAIN) should be supplied by the microcontroller or another
source. This data is sampled by the XE1203F at the next rising edge of DCLK. It is then spread by using an 11-bit
length Barker code. The Figure 11 shows the data exchange during the transmission mode when the Barker
feature is enabled.
dclk
@1154 Hz
information data
from a microcontroller
bit rate = 1154 bps
bit0
bit1
bit2
bit3
bit4
bit5
bit6
Spread data
@12.7 Kchps
spread
bit0
spread
bit1
spread
bit2
spread
bit3
spread
bit4
spread
bit5
Figure 11: Data exchange during transmission mode with the Barker feature enabled
4.3
THE FREQUENCY SYNTHESIZER
? Semtech 2008
16
www.semtech.com
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