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XE1209 数据表(PDF) 3 Page - Semtech Corporation

部件名 XE1209
功能描述  Ultra Low Power CMOS Transceiver
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制造商  SEMTECH [Semtech Corporation]
网页  http://www.semtech.com
标志 SEMTECH - Semtech Corporation

XE1209 数据表(HTML) 3 Page - Semtech Corporation

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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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