LLCC68 datasheet(3/106 Pages) SEMTECH

3 / 106 page

LLCC68

Data Sheet

Rev. 1.0

DS.LLCC68.W.APP

July 2019

3 of 106

Semtech

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 ......................................................................................................................................... 26

4.4.1 Power Amplifier Specifics.................................................................................................26

4.4.2 Power Amplifier Summary ............................................................................................... 28

5. Power Distribution ....................................................................................................................................... 29

5.1 Selecting DC-DC Converter or LDO Regulation ................................................................... 29

5.1.1 Option A: DC-DC Regulator ............................................................................................. 30

5.1.2 Option B: LDO Regulator .................................................................................................. 30

5.1.3 Consideration on the DC-DC Inductor Selection..................................................... 31

5.2 Flexible DIO Supply ........................................................................................................................ 31

6. Modems ........................................................................................................................................................... 32

6.1 LoRa® Modem ................................................................................................................................... 32

6.1.1 Modulation Parameter ......................................................................................................32

6.1.2 LoRa® Packet Engine .......................................................................................................... 35

6.1.3 LoRa® Frame .......................................................................................................................... 35

6.1.4 LoRa® Time-on-Air............................................................................................................... 36

6.1.5 LoRa® Channel Activity Detection (CAD) .................................................................... 36

6.2 FSK Modem ........................................................................................................................................ 38

6.2.1 Modulation Parameter ......................................................................................................38

6.2.2 FSK Packet Engine............................................................................................................... 39

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