SLYT878 April   2026 DAC8771 , DAC8775 , LMR51606 , LMR54406 , TLV9301 , XTR200

 

  1.   1
  2.   2
  3. 1 Choosing the right DC/DC
  4. 2 Controlling the DC/DC output
  5. 3 Example circuit using sourcing current
  6. 4 Example circuit using voltage feedback
  7. 5 Measurements and performance
  8. 6 Precision and noise
  9. 7 Settling time and dynamic performance
  10. 8 Conclusion
  11. 9 Additional resources
  12. 10About the author

6 Precision and noise

A high-resolution analog-to-digital converter measures the effect of the DC/DC ripples on the output, converting 16,000 samples with a 640Ω load at 4 mA and 20 mA, respectively.

Table 1 summarizes the noise calculation and corresponding precision.

Table 1 Noise performance of the adaptive circuit.
Output 4mA 20mA Unit
Mean 4.019 20.17 mA
Root mean square (RMS) noise 325 530 nA
Peak-to-peak noise 2.78 3.51 µA
RMS resolution 18.2 17.5 Bits

The results show that adaptive power doesn't affect the output stage performance, and can support 16-bit output resolution.