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COMBOSOLAR 数据表(PDF) 23 Page - Texas Instruments |
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COMBOSOLAR 数据表(HTML) 23 Page - Texas Instruments |
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23 / 57 page ![]() LPF MCU PGA PA 1 2 f 22 k p W · · · C = Note (2) Inside the AFE031 Tx_F_OUT Tx_PGA_ IN Tx_F_IN1 PA_OUT1 PA_OUT2 Tx_PGA_ OUT Tx_F_IN2 PA_IN C GPIO Note (1) DAC PGA LPF PA SPI MCU 1 2 f 22 k p W · · · C = Note (1) Inside the AFE031 Tx_PGA_IN Tx_PGA_ OUT Tx_F_ IN1 PA_OUT1 PA_OUT2 SCLK DIN DOUT CS Tx_F_ OUT Tx_F_ IN2 PA_IN C AFE031 www.ti.com SBOS531D – AUGUST 2010 – REVISED MAY 2012 The proper connections for the Tx signal path for DAC mode operation are shown in Figure 27. Operating in DAC mode results in the lowest distortion signal injected onto the ac mains. No additional external filtering components are required to meet CENELEC requirements for A, B, C or D bands when operating in DAC mode. (1) For capacitor value C, f is the desired lower cutoff frequency and 22 k Ω is the PA input resistance. Figure 27. Recommended Tx Signal Chain Connections Using DAC Mode In PWM mode (where pin 7 is a logical '0' and Enable1 Register bit location 5 is a logical '0'), the microprocessor general-purpose input/output (GPIO) can be connected directly to either one of the Tx Filter inputs; the unused input should remain unconnected. A lower distortion PWM signal generated from two PWM signals shifted in phase by 90 degrees can be also be input to the Tx Filter through the use of both inputs. Figure 28 and Figure 29 show the proper connections for single PWM and dual PWM operating modes, respectively. (1) Leave unused Tx Filter input unconnected. (2) For capacitor value C, f is the desired lower cutoff frequency and 22 k Ω is the PA input resistance. Figure 28. Recommended Tx Signal Chain Connections in PWM Mode Using One PWM Signal Copyright © 2010–2012, Texas Instruments Incorporated 23 Product Folder Link(s): AFE031 |
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