LLCC68 datasheet(3/111 Pages) SEMTECH

3 / 111 page

LLCC68

Data Sheet

Rev. 1.1

DS.LLCC68.W.APP

Dec 2024

3 of 111

Semtech

LLCC68

www.semtech.com

Table of Contents

1. Architecture.......................................................................................................................... 11

2. Pin Connection ..................................................................................................................... 12

2.1 I/O Description .......................................................................................................... 12

2.2 Package View ............................................................................................................. 13

3. Specifications........................................................................................................................ 14

3.1 ESD Notice ................................................................................................................. 14

3.2 Absolute Maximum Ratings ....................................................................................... 14

3.3 Operating Range ........................................................................................................ 14

3.4 Crystal Specifications ................................................................................................. 15

3.5 Electrical Specifications ............................................................................................. 15

3.5.1 Power Consumption .................................................................................... 16

3.5.2 General Specifications ..................................................................................... 18

3.5.3 Receive Mode Specifications........................................................................... 19

3.5.4 Transmit Mode Specifications ....................................................................... 21

3.5.5 Digital I/O Specifications ................................................................................. 21

4. Circuit Description................................................................................................................ 22

4.1 Clock References ....................................................................................................... 22

4.1.1 RC Frequency References................................................................................ 22

4.1.2 High-Precision Frequency Reference............................................................... 22

4.1.3 XTAL Control Block .......................................................................................... 23

4.1.4 TCXO Control Block.......................................................................................... 24

4.2 Phase-Locked Loop (PLL) ........................................................................................... 24

4.3 Receiver ..................................................................................................................... 25

4.3.1 Intermediate Frequencies ............................................................................... 25

4.4 Transmitter ................................................................................................................ 27

4.4.1 Power Amplifier Specifics .............................................................................. 28

4.4.2 Power Amplifier Summary............................................................................... 30

5. Power Distribution ............................................................................................................... 31

5.1 Selecting DC-DC Converter or LDO Regulation .......................................................... 31

5.1.1 Option A: DC-DC Regulator.............................................................................. 32

5.1.2 Option B: LDO Regulator ................................................................................. 32

5.1.3 Consideration on the DC-DC Inductor Selection ............................................. 33

5.2 Flexible DIO Supply .................................................................................................... 33

6. Modems ............................................................................................................................... 34

6.1 LoRa® Modem ........................................................................................................... 34

6.1.1 Modulation Parameter.................................................................................... 34

6.1.2 LoRa Packet Engine.......................................................................................... 36

6.1.3 LoRa Frame...................................................................................................... 36

6.1.4 LoRa Time-on-Air............................................................................................. 37

6.1.5 LoRa Channel Activity Detection (CAD) ........................................................... 37

6.1.6 RSSI Calibration................................................................................................ 37

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