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DAC11001APFBT Datasheet(PDF) 26 Page - Texas Instruments |
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DAC11001APFBT Datasheet(HTML) 26 Page - Texas Instruments |
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26 / 42 page  1 V V 2 R 1 A x 1 G R § · ¨ ¸ © ¹ DAC110 01 DUT 1 M 1 M G V G I R SENS E R 1 R 2 C 1 C 2 OPA828 INA188 INA188 VREFP VREFN OPA 828 OPA 828 REFNF REFNS REFPF REFPS R CABL E R CABL E + ± + ± + ± 1 2 SW 26 DAC11001A, DAC91001, DAC81001 SLASEL0 – OCTOBER 2019 www.ti.com Product Folder Links: DAC11001A DAC91001 DAC81001 Submit Documentation Feedback Copyright © 2019, Texas Instruments Incorporated 9 Application and Implementation NOTE Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality. 9.1 Application Information The DACx1001 family of DACs are targeted for high-precision applications where ultra-high dc accuracy, ultra- low noise, fast settling, or high total harmonic distortion (THD) is required. The DACx1001 provides 20-bit monotonic resolution. This device finds application in high-performance source measure unit (SMU), battery test equipment (BTE), arbitrary waveform generation (AWG), and closed-loop control applications such as microelectromechanical system (MEMS) actuators, linear actuators, precision motor control, lens autofocus control in precision microscopy, lens control in mass spectrometer, beam control in electron beam lithography, and so on. 9.2 Typical Application 9.2.1 Source Measure Unit (SMU) A source measure unit (SMU) is a common building block in memory and semiconductor test equipment and bench-top source measure units. A DAC is used in an SMU to force a desired voltage or a current to a device- under-test (DUT). Figure 15 provides a simplified circuit diagram of the force-DAC in an SMU. Figure 15. Source Measure Unit 9.2.1.1 Design Requirements • Force voltage range: ±10 V • Force current range: ±20 mA 9.2.1.2 Detailed Design Procedure The DAC11001A is an excellent choice for this application to meet the 20-bit resolution requirement. Switch SW is used to toggle between force-voltage and force-current modes, as shown in Figure 15. The OPA828 is a high- precision amplifier that provides a good balance between dc and ac performance, and can supply ±30-mA output current. The INA188 is a zero-drift instrumentation amplifier with gain selected with an external resistor. The external resistor is not shown in the drawing for simplicity. The gain resistor is not required for a gain of 1. Equation 2 shows the calculation of the voltage gain when switch SW is in position 1. (2) |
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