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SPIRIT1 bảng dữ liệu(PDF) 8 Page - STMicroelectronics

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Introduction
SPIRIT1
8/94
Doc ID 022758 Rev 3
2
Introduction
A simplified block diagram of the SPIRIT1 is shown in Figure 1.
Figure 1.
SPIRIT1 block diagram
The receiver architecture is low-IF conversion. The received RF signal is amplified by a two-
stage low-noise amplifier (LNA) and down-converted in quadrature (I and Q) to the
intermediate frequency (IF). LNA and IF amplifiers make up the RX front-end (RXFE) and
have programmable gain. At IF, I/Q signals are digitized by ADCs. The demodulated data is
then provided to an external MCU either through the 96-byte RX FIFO, readable via SPI, or
directly using a programmable GPIO pin. A 128-bit AES co-processor is available to perform
(offline) data encryption/decryption to secure data transfer.
The transmitter part of the SPIRIT1 is based on direct synthesis of the RF frequency. The
power amplifier (PA) input is the LO generated by the RF synthesizer, while the output level
can be configured between -30 dBm and +11 dBm in 0.5 dB steps. The data to be
transmitted can be provided by an external MCU either through the 96-byte TX FIFO
writable via SPI, or directly using a programmable GPIO pin. The SPIRIT1 supports
frequency hopping, TX/RX and antenna diversity switch control, extending the link range
and improving performance.
The SPIRIT1 has a very efficient power management (PM) system.


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