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RF68

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6. Application Information

6.1. Crystal Specification

The RF68 is designed to operate with a low-cost 22, 24 or 26 MHz crystal

Table 13 RF68 Quartz Crystal Reference Oscillator Specification

Symbol

Description

Min

Typ

Max

Unit

FXOSC

Crystal Frequency

-

22

24

26

-

MHz

LM

Crystal Motional Inductance

-

14.970

13.700

12.655

-

mH

CM

Crystal Motional Capacitance

-

3.495

3.209

2.962

-

fF

RS

Crystal Serial Resistance

-

20

100

Ohms

C0

Crystal Shunt Capacitance

-

1.0

7.0

pF

CL

Load Capacitance

-

15

-

pF

6.2. Reference Design

Figure 11. Reference Schematic

The evaluation module, presented in Figure 11, allows for the seamless evaluation of the RF68 circuit. Several BOM

options are offered to evaluate the performance in all frequency bands.