XE1209C012TRLF Ver la hoja de datos (PDF) - Semtech Corporation

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XE1209C012TRLF

30 – 70 kH Ultra Low Power CMOS Transceiver

Semtech Corporation 

XE1209

Ultra Low Power CMOS Transceiver

Transmitter

The transmitter performs the modulation of an input bit-stream. The main parts of this block are a DDS (Direct

Digital Synthesizer), generating a digital signal with a modulated period, and a power amplifier generating a square-

wave output current controlled by the output of the DDS.

Carrier detector

The function of this block is to detect the presence of a signal at the carrier frequency fc.

Clock generator

The clock generator is composed of a quartz oscillator generating the reference signal at 32.768 kHz, and a PLL

(Phase Locked Loop), whose function is to deliver a signal at a frequency which is a multiple of the oscillator

output; the multiplying factor is programmable on two values.

Service block

This block provides the whole circuit with the required voltage references and current sources.

Digital part

The digital part has two main functions:

• implement the 3-wire interface for the communication with the external microcontroller.

• generate all the internal signals according to the selected mode of operation and the content of the configuration

register

The product has four operating modes:

• a standby mode (M1), where all the blocks are powered off (in this mode, the oscillator can be either on or off

according to the value of a bit (called OSC) stored in the configuration register),

• a carrier detector mode (M2), where only the carrier detector is active,

• a transmitter mode (M3), where the transmitter is powered on,

• A receiver mode (M4), where the receiver is powered on.

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