LLCC68 datasheet(75/111 Pages) SEMTECH

75 / 111 page

LLCC68

Data Sheet

Rev. 1.1

DS.LLCC68.W.APP

Dec 2024

75 of 111

Semtech

LLCC68

www.semtech.com

13.1.13 CalibrateImage

The function CalibrateImage(...) allows the user to calibrate the image rejection of the device for the device operating frequency

band.

For more details on the specific frequency bands, see Section 9.2.1 "Image Calibration for Specific Frequency Bands" on page 56 .

13.1.14 SetPaConfig

The SetPaConfig is controlled as mentioned below.

• paDutyCycle controls the duty cycle (conduction angle). The maximum output power, the power consumption, and the harmonics

drastically change with paDutyCycle. The values given across this datasheet are the recommended settings to achieve the best

efficiency of the PA, obtained on Semtech's reference design PCB. Changing the paDutyCycle affects the distribution of the power in

the harmonics and should be selected to work in conjunction with a given matching network.

• hpMax selects the size of the PA. The maximum output power can be reduced by reducing the value of hpMax. The valid range is

between 0x00 and 0x07 and 0x07 is the maximum supported value to achieve +22dBm output power. Increasing hpMax above 0x07

could cause early aging of the device could damage the device when used in extreme temperatures.

• deviceSel is reserved and has always the value 0x00.

• paLut is reserved and has always the value 0x01.

Table 13-19: CalibrateImage SPI Transaction

Byte

Data from host

Opcode = 0x98

freq1

freq2

Table 13-20: SetPaConfig SPI Transaction

Byte

Data from host

Opcode = 0x95

paDutyCycle

hpMax

deviceSel

reserved and always

0x00

paLut

reserved and always

0x01

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