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LLCC68 Datasheet(PDF) 27 Page - Semtech Corporation

Part # LLCC68
Description  Long Range, Low Power, sub-GHz RF Transceiver
PDF  106 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. 1.0
DS.LLCC68.W.APP
July 2019
27 of 106
Semtech
www.semtech.com
This is illustrated in the following figure:
Figure 4-3: VR_PA versus Output Power on the LLCC68
The internal regulator for VR_PA has a little less than 200 mV of drop-out, which means VBAT must be 200 mV higher than
the published VR_PA voltages in order to attain the corresponding output power. For example, for Pout = +20 dBm, VR_PA
= 2.5 V is required, which means that the LLCC68 will be able to maintain Pout = +20 dBm on the 2.7 V < VBAT < 3.7 V voltage
range. Below 2.7 V, the output power will degrade as VBAT reduces.
As can be seen from the blue curve on Figure 4-3: VR_PA versus Output Power on the LLCC68, the LLCC68 will be capable
of supplying almost 1.7 V when VBAT = 1.8 V, which, in turn, will make the output power plateau at +17 dBm for all power
settings above +17 dBm.
The following plot confirms the linearity of the output power, as long as the VBAT voltage is high enough to supply the
required VR_PA voltage:
Figure 4-4: Power Linearity on the LLCC68



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