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DAC8801IDGKT Folha de dados(PDF) 11 Page - Burr-Brown (TI) |
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DAC8801IDGKT Folha de dados(HTML) 11 Page - Burr-Brown (TI) |
11 / 16 page www.ti.com Bipolar Output Circuit V OUT + D 16, 384 * 1 V REF (2) R FB OPA277 U4 −2.5 V 3 VOUT 3 +2.5 V VOUT 10 kW 10 kW +2.5 V VREF VDD VDD GND DAC8801 OPA277 U2 IOUT C1 C2 5 kW − + − + (+10 V) (−10 V 3 VOUT 3 +10 V) Programmable Current Source Circuit I L + (R2 ) R3) R1 R3 V REF D (3) VDD VDD VREF VREF DAC8801 U1 RFB OPA277 U2 IOUT GND 150 kW R14 15 kW R24 C1 10 pF OPA277 U2 15 kW R2 50 W R34 50 W R3 VOUT 150 kW R1 IL LOAD − + + − DAC8801 SLAS403A – NOVEMBER 2004 – REVISED DECEMBER 2004 The DAC8801, 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. Figure 22. Bipolar Output Circuit A DAC8801 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. A application of this circuit includes a 4-mA to 20-mA current transmitter with up to a 500- Ω load. With a matched resistor network, the load current of the circuit is shown in Equation 3: Figure 23. Programmable Bidirectional Current Source Circuit 11 |
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