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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LLCC68 датащи(PDF) 27 Page - Semtech Corporation |
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LLCC68 датащи(HTML) 27 Page - Semtech Corporation |
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27 / 111 page  LLCC68 Data Sheet Rev. 1.1 DS.LLCC68.W.APP Dec 2024 27 of 111 Semtech LLCC68 www.semtech.com 4.4 Transmitter The transmit chain uses the modulated output from the modem bank which directly modulates the fractional-N PLL. An optional pre-filtering of the bit stream can be enabled to reduce the power in the adjacent channels, also dependent on the selected modulation type. The default maximum RF output power of the transmitter is +22dBm. The RF output power is programmable with 32dB of dynamic range, in 1dB steps. The power amplifier ramping time is also programmable to meet regulatory requirements. The power amplifier is supplied by the regulator VR_PA and the connection between VR_PA and RFO is done externally to the chip. VR_PA, supplied through VDD_IN, is taken directly from the battery and in this case maximum output power is limited by supply voltage at VDD_IN. • Figure 4-3: PA Supply Scheme in DC-DC Mode 1.8 to 3.7V VBAT LDO DC-DC DCC_SW VREG (1.55V) VDD_IN (1.8 to 3.7V) REG PA VR_PA (up to 3.1V) RFO PA LP CORE (RX) (PLL) 6 (1.55V) |
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