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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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LLCC68 데이터시트(PDF) 71 Page - Semtech Corporation |
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LLCC68 데이터시트(HTML) 71 Page - Semtech Corporation |
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71 / 106 page  LLCC68 Data Sheet Rev. 1.0 DS.LLCC68.W.APP July 2019 71 of 106 Semtech www.semtech.com For more details on the specific frequency bands, see Section 9.2.1 "Image Calibration for Specific Frequency Bands" on page 51. 13.1.14 SetPaConfig SetPaConfig is controlled as mentioned below. paDutyCycle controls the duty cycle (conduction angle). The maximum output power, the power consumption, and the harmonics will drastically change with paDutyCycle. The values given across this datasheet are the recommended settings to achieve the best efficiency of the PA. Changing the paDutyCycle will affect 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 +22 dBm 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. 13.1.14.1 PA Optimal Settings PA optimal settings are used to maximize the PA efficiency when the requested output power is lower than the nominal +22 dBm. For example, the maximum output power in Japan is +10 dBm, and in China it is +17 dBm in some bands. Those optimal settings require: • a dedicated matching / PA load impedance • a specific tweaking of the PA settings, described in Table 13-21: PA Operating Modes with Optimal Settings Table 13-20: SetPaConfig SPI Transaction Byte 0 1 2 3 4 Data from host Opcode = 0x95 paDutyCycle hpMax deviceSel reserved and always 0x00 paLut reserved and always 0x01 Table 13-21: PA Operating Modes with Optimal Settings Output Power paDutyCycle hpMax deviceSel paLut Value in SetTxParams1 1. See Section 13.4.4 "SetTxParams" on page 79. +22 dBm 0x04 0x07 0x00 0x01 +22 dBm +20 dBm 0x03 0x05 0x00 0x01 +22 dBm +17 dBm 0x02 0x03 0x00 0x01 +22 dBm +14 dBm 0x02 0x02 0x00 0x01 +22 dBm |
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