SX1242, Rev 1, November 2010

©2010 Semtech Corp.

SX1242

www.semtech.com

Page 9

Integrated Transmitter IC

ADVANCED COMMUNICATIONS & SENSING

DATASHEET

4. Application Information

4.1. Crystal Specification

The SX1242 is designed to operate with a low-cost 26 MHz crystal. The recommended crystal specification is tabulated

below in Table 6.

Table 6

SX1242 Quartz Crystal Reference Oscillator Specification

4.2. Reference Design Schematic

Figure 5. Application Module Schematic

Symbol

Description

Conditions

Min

Typ

Max

Unit

FXOSC

Crystal Frequency

26

26

26

MHz

LM

Crystal Motional Inductance

-

12.655

-

mH

CM

Crystal Motional Capacitance

-

2.962

-

fF

RS

Crystal Serial Resistance

-

20

100

Ohms

C0

Crystal Shunt Capacitance

-

1.0

7.0

pF

CL

Load Capacitance

-

15

-

pF

TX EN

DATA

VDD

NC

NC

NC

NC

GND

1

2

3

45

6

7

8

POD_INI

GND

DATA

RFOUT

XTAL

TX EN

VDD

GND

VDD

1

2

3

45

6

7

8

U1

SX1242

VDD

C10

C11

L1

C7

C6

C5

C3

C4

C8

L2

L3

C2

Q1

C12