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DAC8811ICDGKRG4 数据表(PDF) 13 Page - Texas Instruments |
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DAC8811ICDGKRG4 数据表(HTML) 13 Page - Texas Instruments |
13 / 29 page L REF R2 R3 / R1 I x V x D R3 -2.5V ” VOUT ” +2.5V (-10s G sOUT G +10V) 10 k: 10 k: 5 k: OUT REF D V - 1 x V 32,768 § · ¨ ¸ © ¹ 0 ” VOUT ” +2.5V 13 DAC8811 www.ti.com SLAS411D – NOVEMBER 2004 – REVISED FEBRUARY 2016 Product Folder Links: DAC8811 Submit Documentation Feedback Copyright © 2004–2016, Texas Instruments Incorporated Feature Description (continued) Figure 21. Positive Voltage Output Circuit 8.3.3 Bipolar Output Circuit The DAC8811, as a 2-quadrant multiplying DAC, can be used to generate a unipolar output. The polarity of the full-scale output IOUT is the inverse of the input reference voltage at VREF. Some applications require full 4-quadrant multiplying capabilities or bipolar output swing. As shown in Figure 22, external op amp U4 is added as a summing amp and has a gain of 2X that widens the output span to 5 V. A 4- quadrant multiplying circuit is implemented by using a 2.5-V offset of the reference voltage to bias U4. According to the circuit transfer equation given in Equation 2, input data (D) from code 0 to full scale produces output voltages of VOUT = -2.5 V to VOUT = +2.5 V. (2) External resistance mismatching is the significant error in Figure 22. Figure 22. Bipolar Output Circuit 8.3.4 Programmable Current Source Circuit A DAC8811 can be integrated into the circuit in Figure 23 to implement an improved Howland current pump for precise voltage to current conversions. Bidirectional current flow and high voltage compliance are two features of the circuit. With a matched resistor network, the load current of the circuit is shown by Equation 3: (3) The value of R3 in the previous equation can be reduced to increase the output current drive of U3. U3 can drive ±20 mA in both directions with voltage compliance limited up to 15 V by the U3 voltage supply. Elimination of the circuit compensation capacitor C1 in the circuit is not suggested as a result of the change in the output impedance ZO, according to Equation 4: |
类似零件编号 - DAC8811ICDGKRG4 |
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类似说明 - DAC8811ICDGKRG4 |
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