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DAC8811IBDGKT 数据表(PDF) 10 Page - Texas Instruments |
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DAC8811IBDGKT 数据表(HTML) 10 Page - Texas Instruments |
10 / 21 page www.ti.com GND OPA277 −2.5V GND 0 3 VOUT 3 +2.5V VOUT IOUT OPA277 C1 RFB DAC8811 VDD VDD +2.5V Reference VIN VOUT VREF − + − + Bipolar Output Circuit V OUT + D 32, 768 * 1 V REF (2) R FB OPA277 U4 −2.5V 3 VOUT 3 +2.5V (−10V 3 VOUT 3 +10V) VOUT 10 kW 10 kW +2.5V (+10V) VREF VDD VDD GND DAC8811 OPA277 U2 IOUT C1 C2 5 kW − + − + Programmable Current Source Circuit I L + (R2 )R3) R1 R3 V REF D (3) DAC8811 SLAS411B – NOVEMBER 2004 – REVISED FEBRUARY 2007 APPLICATION INFORMATION (continued) Figure 21. Positive Voltage 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. External resistance mismatching is the significant error in Figure 22. Figure 22. Bipolar Output 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: 10 Submit Documentation Feedback |
类似零件编号 - DAC8811IBDGKT |
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类似说明 - DAC8811IBDGKT |
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