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Si4355-B1A-FM датащи(PDF) 11 Page - Silicon Laboratories |
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Si4355-B1A-FM датащи(HTML) 11 Page - Silicon Laboratories |
11 / 34 page Si4355 Rev 1.0 11 3. Functional Description Figure 2. Si4355 Functional Block Diagram 3.1. Overview The Si4355 is an easy-to-use, size efficient, low current wireless ISM receiver that covers the sub-GHz bands. The wide operating voltage range of 1.8–3.6 V and low current consumption make the Si4355 an ideal solution for battery powered applications. The Si4355 uses a single-conversion mixer to downconvert the FSK/GFSK or OOK modulated receive signal to a low IF frequency. Following a programmable gain amplifier (PGA) the signal is converted to the digital domain by a high performance ADC allowing filtering, demodulation, slicing, and packet handling to be performed in the built-in DSP, increasing the receiver’s performance and flexibility versus analog based architectures. The demodulated signal is output to the system MCU through a programmable GPIO or via the standard SPI bus by reading the 64-byte Rx FIFO. A high precision local oscillator (LO) is used and is generated by an integrated VCO and Fractional-N PLL synthesizer. The Si4355 operates in the frequency bands of 283–350, 425–525, and 850–960 MHz. Additional system features, such as 64 byte Rx FIFO, preamble detection, sync word detector and CRC, reduce overall current consumption, and allow for the use of lower-cost system MCUs. Power-on-reset (POR), and GPIOs further reduce overall system cost and size. The Si4355 is designed to work with an MCU, crystal, and a few passives to create a very compact and low-cost system. 3.2. Receiver Chain The internal low-noise amplifier (LNA) is designed to be a wide-band LNA that can be matched with three external discrete components to cover any common range of frequencies in the sub-GHz band. The LNA has extremely low noise to suppress the noise of the following stages and achieve optimal sensitivity; so, no external gain or front-end modules are necessary. The LNA has gain control, which is controlled by the internal automatic gain control (AGC) algorithm. The LNA is followed by an I-Q mixer, filter, programmable gain amplifier (PGA), and ADC. The I-Q mixers downconvert the signal to an intermediate frequency. The PGA then boosts the gain to be within dynamic range of the ADC. The ADC rejects out-of-band blockers and converts the signal to the digital domain where filtering, demodulation, and processing is performed. Peak detectors are integrated at the output of the LNA and PGA for use in the AGC algorithm. Rx Modem Synthesizer LNA PGA ADC Rx Chain Battery Voltage Sensor Aux ADC 25-32MHz XO SDN RXp RXn VDD GPIO0 GPIO1 nSEL SDI SDO SCLK nIRQ XOUT XIN GPIO2 GPIO3 |
Аналогичный номер детали - Si4355-B1A-FM |
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Аналогичное описание - Si4355-B1A-FM |
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