SX1231-31SKB868-EVAL Semtech, SX1231-31SKB868-EVAL Datasheet - Page 19

• Manufacturer Part Number: SX1231-31SKB868-EVAL
• Description: development tool usb kit for sx1231 transceiver...
• Manufacturer: Semtech

3.4. Transmitter Description
The transmitter of SX1231 comprises the frequency synthesizer, modulator and power amplifier blocks.
3.4.1. Architecture Description
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:
Amongst others, the following Bit Rates are accessible:
Rev 4 - Nov 2010
ADVANCED COMMUNICATIONS & SENSING
PA_BOOST
RFIO
Figure 5. Transmitter Block Diagram
LNA
PA0
PA1
PA2
BR
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BitRate
F
XOSC
Receiver Chain
Oscillator
Local
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SX1231