LLCC68 datasheet(27/106 Pages) SEMTECH

tên linh kiện	LLCC68

Giải thích chi tiết về linh kiện	Long Range, Low Power, sub-GHz RF Transceiver

PDF	106 Pages

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nhà sản xuất	SEMTECH [Semtech Corporation]

Trang chủ	http://www.semtech.com

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27 / 106 page

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

LLCC68 bảng dữ liệu(PDF) 27 Page - Semtech Corporation