LLCC68 datasheet(15/111 Pages) SEMTECH

15 / 111 page

LLCC68

Data Sheet

Rev. 1.1

DS.LLCC68.W.APP

Dec 2024

15 of 111

Semtech

LLCC68

www.semtech.com

3.4 Crystal Specifications

The reference frequency accuracy is defined by the complete system, and should take into account precision of the transmitter and the

receiver, as well as environmental parameters such as extreme temperature limits. In a LoRaWAN system, the expected reference

frequency accuracy on the end-device should be about +/- 30ppm under all operating conditions. This includes initial error, temperature

drift and ageing over the lifetime of the product.

3.5 Electrical Specifications

The electrical specifications are given with the following conditions unless otherwise specified:

• VBAT_IO = VBAT = 3.3V, all current consumptions are given for VBAT connected to VBAT_IO

• Temperature = 25°C

• FXOSC = 32MHz, with specified crystal

• FRF = 434/490/868/915 MHz

• All RF impedances matched

• Transmit mode output power defined into a 50load impedance

• FSK BER = 0.1%, 2-level FSK modulation without pre-filtering, BR = 4.8kb/s, FDA = ± 5kHz, BW_F = 20kHz double-sided

• LoRa PER = 1%, packet 64 bytes, preamble 8 symbols, CR = 4/5, CRC on payload enabled, explicit header mode

• RX/TX specifications given using default RX gain step and direct tie connection between Rx and Tx

• Blocking immunity, ACR and co-channel rejection are given for a single tone (CW) interferer and referenced to sensitivity +3dB

• Optional TCXO and RF Switch power consumption always excluded

Caution!

Throughout this document, all receiver bandwidths are expressed as “double-sideband”. This is valid for LoRa and FSK modulations.

Table 3-4: Crystal Specifications

Symbol

Description

Min

Typ

Max

Unit

FXOSC

Crystal oscillator frequency

MHz

CLOAD

Crystal load capacitance

C0XTAL

Crystal shunt capacitance

0.3

0.6

RSXTAL

Crystal series resistance



CMXTAL

Crystal motional capacitance

1.3

1.89

2.5

DRIVE

Drive level

100



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