LLCC68 datasheet(27/111 Pages) SEMTECH

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

VR_PA (up to 3.1V)

RFO

PA LP

CORE

(RX)

(PLL)

(1.55V)

LLCC68 データシート(PDF) 27 Page - Semtech Corporation

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