SX1233IMLTRT Semtech, SX1233IMLTRT Datasheet - Page 32

• Manufacturer Part Number: SX1233IMLTRT
• Description: RF Transceiver Extended Bands Japan-Korea
• Manufacturer: Semtech

Specifications of SX1233IMLTRT

• Transmitting Current: 95mA
• Data Rate: 600Kbps
• Rf Ic Case Style: QFN
• No. Of Pins: 24
• Supply Voltage Range: 1.8V To 3.6V
• Operating Temperature Range: -40°C To +85°C
• Receiving Current: 17mA

signed result is loaded in FeiValue in RegFei, in 2’s complement format. The time required for an FEI evaluation is 4 times
the bit period.
To ensure a proper behavior of the FEI:
The 20 dB bandwidth of the signal can be evaluated as follows (double-side bandwidth):
The frequency error, in Hz, can be calculated with the following formula:
3.5.15. Automatic Frequency Correction
The AFC is based on the FEI block, and therefore the same input signal and receiver setting conditions apply. When the
AFC procedure is done, AfcValue is directly subtracted to the register that defines the frequency of operation of the chip,
F
When the AFC is automatically triggered (AfcAutoOn = 1), the user has the option to:
Rev 5 - June 2011
ADVANCED COMMUNICATIONS & SENSING
RF
The operation must be done during the reception of preamble
The sum of the frequency offset and the 20 dB signal bandwidth must be lower than the base band filter bandwidth
Each time the receiver is enabled, if AfcAutoOn = 1
Upon user request, by setting bit AfcStart in RegAfcFei, if AfcAutoOn = 0
Clear the former AFC correction value, if AfcAutoClearOn = 1
. The AFC can be launched:
Preamble-modulated input signal
Figure 14. FEI Process
BW
FEI
Signal level > Sensitivity
20 dB
SX1239 in Rx mode
=
Set FeiStart
Yes
F
=
FeiValue
FeiDone
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STEP
3
Read
2
= 1
= 1
×
⎛
⎝
×
F
FeiValue
DEV
No
+
BR
------ -
2
⎞
⎠
DATASHEET
www.semtech.com
SX1233