SLAAE64 may   2023 AFE58JD48 , DAC81001 , DAC8801 , DAC8830 , OPA2210 , REF50 , REF50E , THS4130

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Proposed Topologies
    1. 2.1 Proposal 1: Using R-2R DAC (DAC8830)
      1. 2.1.1 Highlighted Products
        1. 2.1.1.1 DAC8830
        2. 2.1.1.2 OPA2210
        3. 2.1.1.3 THS4130
        4. 2.1.1.4 REF5040
      2. 2.1.2 Design Circuit
      3. 2.1.3 PSpice-TI Simulation
    2. 2.2 Proposal 2: Using M-DAC (DAC8801)
      1. 2.2.1 Highlighted Products
        1. 2.2.1.1 DAC8801
        2. 2.2.1.2 OPA2210
        3. 2.2.1.3 THS4130
        4. 2.2.1.4 REF5010
      2. 2.2.2 Design Circuit
      3. 2.2.3 PSpice-TI Simulation
    3. 2.3 Proposal 3: Using Low-Noise R-2R DAC (DAC81001)
      1. 2.3.1 Highlighted Products
        1. 2.3.1.1 DAC81001
        2. 2.3.1.2 OPA2210
        3. 2.3.1.3 THS4130
        4. 2.3.1.4 REF5010
      2. 2.3.2 Design Circuit
      3. 2.3.3 PSpice-TI Simulation
  6. 3Conclusion
  7. 4References

2.2.3 PSpice-TI Simulation

Download the PSpice-TI simulation models for the relevant components from https://www.ti.com. The reference section of the circuit shown in Figure 2-6 can be simulated in PSpice-TI (shown in Figure 2-7) and noise analysis can be performed.


GUID-A2760E74-B339-4403-A114-199941C052CF-low.png

Figure 2-7 PSpice-TI Simulation for Reference Circuit (in previous image)

This noise is bandwidth-limited using the resistor-capacitor (R-C) filter at the output. Figure 2-8 shows the simulated results for the noise contribution from REF5010. Figure 2-9 shows the modeled noise contribution of the DAC8801 at the maximum output current.


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Figure 2-8 Noise Contribution From the Reference Circuit

GUID-20221116-SS0I-MRGT-BPQG-DM79FNPRVQFQ-low.svg

Figure 2-9 Noise Model for the DAC8801

Figure 2-10 shows the PSpice -TI simulation for the entire circuit.


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Figure 2-10 PSpice-TI Simulation of the Proposal 2 VCNTL Drive Circuit

Figure 2-11 shows the noise contribution of the proposal 2 circuit, the output noise of 1.703 nV/√Hz at 1 kHz indicates that such a drive circuit can drive about 64 to 128 channels simultaneously.


GUID-20221116-SS0I-VPLJ-HFW3-WWNNNQC7JVN8-low.png

Figure 2-11 Noise Contribution of the Proposal 2 Circuit