SX1231
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
3.4. Transmitter Description
The transmitter of SX1231 comprises the frequency synthesizer, modulator and power amplifier blocks.
3.4.1. Architecture Description
LNA
Receiver Chain
RFIO
PA0
Local
Oscillator
PA1
PA2
PA_BOOST
Figure 5. Transmitter Block Diagram
3.4.2. Bit Rate Setting
When using the SX1231 in Continuous mode, the data stream to be transmitted can be input directly to the modulator via
pin 9 (DIO2/DATA) in an asynchronous manner, unless Gaussian filtering is used, in which case the DCLK signal on pin 10
(DIO1/DCLK) is used to synchronize the data stream. See section 3.4.5 for details on the Gaussian filter.
In Packet mode or in Continuous mode with Gaussian filtering enabled (refer to section 5.5 for details), the Bit Rate (BR) is
controlled by bits BitRate in RegBitrate:
FXOSC
-------------------
BR =
BitRate
Amongst others, the following Bit Rates are accessible:
Rev 2 - Nov 2009
Page 19
www.semtech.com
SEMTECH [ SEMTECH CORPORATION ]
