SBOA594 August   2024 OPA2990

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1 Introduction
  5. 2 Circuit Description
  6. 3 Supporting Multiple Output Ranges
  7. 4 Resistor Sizing, M2 Selection, and Other Design Considerations
  8. 5 Mode and Range Control
  9. 6 Supply Level for Current Output
  10. 7 Supply Levels for Voltage Output
  11. 8 Protection Features
  12. 9 Measurement Results
  13. 10Power Consumption
  14. 11Error Monte-Carlo Analysis
  15. 12Rise and Fall Times
  16. 13Building Multi-Channel Output
  17. 14Summary
  18. 15References

13 Building Multi-Channel Output

The combined V/I circuit can be connected to a standard DAC to build configurable multi-channel output module. The DAC8050x family is a good fit for this, it offers 1 up to 8 channels, with 16b of resolution, and 1LSB INL, buffered voltage output, it has also the counterparts in 12, and 14 bits (DAC6050x, and DAC7050x). The DAC has integrated 2.5V reference which is available on external pin.

The DAC output range can be adjusted to either 2.5V or 1.25V but setting the DAC GAIN to either x1 or x2 enabling the DAC to achieve the easily implement the 0-5V output range.

Figure 13-1 shows a simplified block diagram for a 2-channel configurable range AOUT. Each of BUF1 and BUF2 represent the V/I circuit proposed.

2-Channel Output Block Diagram Figure 13-1 2-Channel Output Block Diagram