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LLCC68 Datasheet(PDF) 27 Page - Semtech Corporation

Part # LLCC68
Description  Long Range, Low Power, sub-GHz RF Transceiver
PDF  111 Pages
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Manufacturer  SEMTECH [Semtech Corporation]
Direct Link  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

LLCC68 Datasheet(HTML) 27 Page - Semtech Corporation

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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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