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COMBOSOLAR 数据表(PDF) 30 Page - Texas Instruments |
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COMBOSOLAR 数据表(HTML) 30 Page - Texas Instruments |
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30 / 57 page  AVDD 2 External 1-nF noise reduction capacitor AVDD R R AGND Inside the AFE031 4 kW bias Internal REF2 External 1- F noise reduction capacitor m PA_V S R R PA_GND Inside the AFE031 4 kW PA_V 2 S bias Internal REF1 AFE031 SBOS531D – AUGUST 2010 – REVISED MAY 2012 www.ti.com REF1 and REF2 Blocks The REF1 and REF2 blocks create midscale power-supply biasing points used internally to the AFE031. Each reference divides its respective power-supply voltage in half with a precision resistive voltage divider. REF1 provides a PA_VS/2 voltage used for the PA, while REF2 provides an AVDD/2 voltage used for the Tx PGA, Tx Filter, Rx PGA1, Rx Filter, and Rx PGA2. Each REF block has its output brought out to an external pin that can be used for filtering and noise reduction. Figure 36 and Figure 37 show the proper connections of the external noise-reducing capacitors. These capacitors are optional, but are recommended for best performance. Figure 36. REF1 Functional Diagram Figure 37. REF2 Functional Diagram 30 Copyright © 2010–2012, Texas Instruments Incorporated Product Folder Link(s): AFE031 |
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