LLCC68 datasheet(25/111 Pages) SEMTECH

25 / 111 page

LLCC68

Data Sheet

Rev. 1.1

DS.LLCC68.W.APP

Dec 2024

25 of 111

Semtech

LLCC68

www.semtech.com

4.3 Receiver

The received RF signal is first amplified by a differential Low Noise Amplifier (LNA), then down-converted to low- IF intermediate frequency

by mixers operating in quadrature configuration. The I and Q signals are low-pass filtered and then digitized by a continuous time feedback

architecture  converter (ADC) allowing more than 80dB dynamic range. Once in the digital domain the signal is then decimated,

down-converted again, decimated again, channel filtered and finally demodulated by the selected modem depending on modulation

scheme: FSK modem or LoRa modem.

4.3.1 Intermediate Frequencies

The LLCC68 receiver mostly operates in low-IF configuration, expect for specific high-bandwidth settings.

Table 4-2: Intermediate Frequencies in FSK Mode

Setting Name

Bandwidth [kHz DSB]

Intermediate Frequency [kHz]

RX_BW_467

467.0

250

RX_BW_234

234.3

250

RX_BW_117

117.3

250

RX_BW_58

58.6

250

RX_BW_29

29.3

250

RX_BW_14

14.6

250

RX_BW_7

7.3

250

RX_BW_373

373.6

200

RX_BW_187

187.2

200

RX_BW_93

93.8

200

RX_BW_46

46.9

200

RX_BW_23

23.4

200

RX_BW_11

11.7

200

RX_BW_5

5.8

200

RX_BW_312

312.0

167

RX_BW_156

156.2

167

RX_BW_78

78.2

167

RX_BW_39

39.0

167

RX_BW_19

19.5

167

RX_BW_9

9.7

167

RX_BW_4

4.8

167

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