XE1203F データシートの表示（PDF） - Semtech Corporation

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XE1203F

433 MHz / 868 MHz / 915 MHz Low-Power, Integrated UHF Transceiver

Semtech Corporation 

XE1203F

4 GENERAL DESCRIPTION

The XE1203F is a direct conversion (Zero-IF) half-duplex data transceiver. The circuit operates in three different

ISM frequency bands (433 MHz, 868 MHz and 915 MHz) and uses 2-level FSK modulation/demodulation to provide

a complete transmission link. It is capable of operating at data rates between 1.2 and 152.3 kbit/s, making it ideally

suited for applications where high data rates are required. It also supports the Konnex standard where the bit rate is

32.7 kbit/s. The device includes dedicated Barker encoder/decoder hardware that may be activated to

modulate/demodulate the transmitted signal to reduce in-band interferences.

The XE1203F is a highly programmable device – channel, bit rate, frequency deviation, output power, base band

filter bandwidth, sensitivity vs. linearity, RSSI feature, and many other parameters – which makes it extremely

flexible, to meet a large number of end user requirements.

The main functional blocks of the XE1203F are the receiver, the transmitter, the frequency synthesizer and some

service blocks. The device also includes a series of configuration and status registers. In a typical application, the

XE1203F is programmed by a microcontroller via the 3-wire serial bus SI, SO, SCK to write to and read from these

registers.

The Receiver converts the incoming 2-level FSK modulated signal into a synchronized bit stream.

The Transmitter performs the modulation of the carrier by an input bit stream and the transmission of the

modulated signal.

The Frequency Synthesizer generates the local oscillator (LO) signal for the receiver section as well as the

continuous phase FSK modulated signal for the transmitter section.

The Service Blocks provide the internal voltage and current sources and provide all the necessary functions for the

circuit to work properly.

The Configuration Registers are a set of variable-length registers that are used to store various settings to

operate the XE1203F transceiver circuit. They are listed below in Table 4. Refer to Section 5.2 for the detailed

descriptions of these registers. These registers are accessed in write or read mode through the 3-wire serial bus, as

described in Section 5.1.

Name

ConfigSwitch

RTParam

FSParam

SWParam

DataOut

ADParam

Pattern

Description

1-bit data to switch between 2 sets of user-predefined SWParam Configuration Registers

Receiver and transmitter parameters

LO, Bitrate, Deviation and other frequency parameters

2 sets of user-predefined configuration registers

Status register which can be read through the 3-wire serial interface

Additional parameters

Reference pattern for the “pattern recognition” feature

Table 4: Configuration Registers

Naming convention: throughout this document, each individual bit in a particular Configuration Register includes the

name of this register followed by a bit identifier. For example, RTParam_Band are the “Band” bits within the

RTParam register.

The Digital Interface provides internal control signals for the whole circuit according to the configuration register

settings.

4.1 THE RECEIVER SECTION

The receiver converts the incoming 2-level FSK modulated signal into a synchronized bit stream. The receiver is

composed of a low-noise amplifier, two down-conversion mixers, two base band filters, two base band amplifiers,

two limiters, a demodulator and a bit synchronizer. The bit synchronizer translates the output of the demodulator

into a glitch-free bit stream available on the pin DATA. It also generates a synchronized clock, DCLK, which can be

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