SX1243IULTRT Просмотр технического описания (PDF) - Semtech Corporation

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SX1243IULTRT

Low Cost Low Current Integrated Transmitter 310 to 928MHz Frequency Agile

Semtech Corporation 

WIRELESS & SENSING

SX1243

Integrated Transmitter IC

DATASHEET

This product datasheet contains a detailed description of the SX1243 performance and functionality.

1. Circuit Description

1.1. General Description

The SX1243 is a fully-integrated multi-band, single chip transmitter IC capable of FSK and OOK modulation of an input

data stream.

It contains a frequency synthesizer which is a fractional-N sigma-delta PLL. For frequency modulation (FSK), the

modulation is made inside the PLL bandwidth. For amplitude modulation (OOK), the modulation is performed by turning on

and off the output PA.

The frequency reference used by the PLL is generated by a 22, 24 or 26 MHz crystal oscillator, depending on the

frequency band of interest.

The Power Amplifier (PA), connected to the RFOUT pin, can deliver 0 dBm or +10 dBm in a 50 Ω load. Each of these two

output powers need a specific matching network when efficiency needs to be optimized.

The circuit can be configured via a simplified TWI interface, constituted of pin CTRL and DATA. The pins of this interface

are also used to transmit the modulating data to the chip.

Another key feature of the SX1243 is its low current consumption in Transmit and Sleep modes and its wide voltage

operating range from 1.8 V to 3.7 V. This makes the SX1243 suitable for low-cost battery chemistries or energy harvesting

applications.

1.2. Block Diagram

The figure below shows the simplified block diagram of the SX1243 die mounted in a DFN8 package.

NRESET

1

DATA

2

GND

3

XTAL

4

PA

CP

M/N

PFD

Sigma

/Delta

RFOUT

8

7 TX_READY

CTRL

6

VDD

5

1.8 to 3.7 V

Figure 1. SX1243 Simplified Block Diagram and BOM

SX1243, Rev 3, May 2012

©2012 Semtech Corporation

Page 3

www.semtech.com

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