SX1240 Просмотр технического описания (PDF) - Semtech Corporation

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SX1240

Low Cost Integrated Transmitter IC 434 MHz and 868 MHz Band RF Transmitter

Semtech Corporation 

ADVANCED COMMUNICATIONS & SENSING

SX1240

Integrated Transmitter IC

DATASHEET

5. Application Information

5.1. Crystal Specification

The SX1240 is designed to operate with a low-cost 26 MHz crystal.

Table 9 SX1240 Quartz Crystal Reference Oscillator Specification

Symbol Description

Conditions

Min

FXOSC Crystal Frequency

26

LM

Crystal Motional Inductance

-

CM

Crystal Motional Capacitance

-

RS

Crystal Serial Resistance

-

C0

Crystal Shunt Capacitance

-

CL

Load Capacitance

-

5.2. Reference Design Schematics

Typ

26

12.655

2.962

20

1.0

15

Max

Unit

26

MHz

-

mH

-

fF

100

Ohms

7.0

pF

-

pF

VCC

R1

C6

C5

P1

GND

10

Data

9

8

7

R6

Ctrl

GND

6

5

Q1

4

3

2

VBAT

R_VBAT

GND

1

1

XTAL

MHDR1X10

26 MHz

GND

Q2

GND GND

L1

U1 SX1240

1 GND

RFOUT 8

2 DATA

GND 7 GND

3 GND

4 XTAL

SCK

VBAT

6

5 VCC

2

R2

GND

NC

C1

L2

C7

GND

R3

VCC

NC

GND

1

3

R4

0R0

xtal

26 MHz

24

GND

C2

C3

L3

C8

Antenna1

RFIO1

LM

C4

C11

GND

GND

GND

GND

Figure 9. Application Module Schematics (See BoM for Optional Components)

SX1240, Rev 1, Oct 2010

©2010 Semtech Corp.

Page 14

www.semtech.com

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