SX1242 Просмотр технического описания (PDF) - Semtech Corporation

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SX1242

Low Cost Integrated Transmitter IC 344.940 MHz RF Transmitter

Semtech Corporation 

ADVANCED COMMUNICATIONS & SENSING

SX1242

Integrated Transmitter IC

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

Symbol Description

FXOSC Crystal Frequency

LM

Crystal Motional Inductance

CM

Crystal Motional Capacitance

RS

Crystal Serial Resistance

C0

Crystal Shunt Capacitance

CL

Load Capacitance

Conditions

Min

Typ

26

26

-

12.655

-

2.962

-

20

-

1.0

-

15

Max

Unit

26

MHz

-

mH

-

fF

100

Ohms

7.0

pF

-

pF

4.2. Reference Design Schematic

C11

POD_INI

1 TX EN VDD 8

2 DATA GND 7

3 NC

NC 6

4 NC

NC 5

C2

Q1

C5

C6

U1 SX1242

1 GND RFOUT 8

2 DATA VDD 7

3 GND TX EN 6

4 XTAL VDD 5

VDD

C3

L1

C7

C10

L2

L3

C4

C12

C8

SX1242, Rev 1, November 2010

©2010 Semtech Corp.

Figure 5. Application Module Schematic

Page 9

www.semtech.com

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