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AFE031AIRGZRG4 Datasheet(PDF) 32 Page - Texas Instruments |
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AFE031AIRGZRG4 Datasheet(HTML) 32 Page - Texas Instruments |
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32 / 59 page ![]() AVDD 2 External 1-nF noise reduction capacitor AVDD R R AGND Inside the AFE031 4 kW bias Internal REF2 Copyright © 2017, Texas Instruments Incorporated 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 Copyright © 2017, Texas Instruments Incorporated 32 AFE031 SBOS531E – AUGUST 2010 – REVISED JUNE 2019 www.ti.com Product Folder Links: AFE031 Submit Documentation Feedback Copyright © 2010–2019, Texas Instruments Incorporated 9.2.5 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 35 and Figure 36 show the proper connections of the external noise-reducing capacitors. These capacitors are optional, but are recommended for best performance. Figure 35. REF1 Functional Diagram Figure 36. REF2 Functional Diagram |
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