SDAA088 September   2025 AMC0100R , AMC0311R , AMC0311R-Q1 , AMC0330D , AMC0330R , AMC0330R-Q1 , AMC0330S , AMC0336

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Pairing Ratiometric Output Isolation Amplifier With ADC
    1. 2.1 Test Setup
    2. 2.2 REFIN Voltage Tracking
    3. 2.3 Ratiometric Configuration Noise Rejection
    4. 2.4 Spurious-Free Dynamic Range
    5. 2.5 Transient Response of REFIN to VOUT
    6. 2.6 Transfer Function of REFIN to VOUT
  6. 3Summary
  7. 4References

2.5 Transient Response of REFIN to VOUT

When the input voltage VIN is0V, the output voltage of the AMC0330R device is VOUT=VREFIN/2. This test investigates how quickly the output voltage VOUT responds to the changes in the reference voltage VREF. Figure 2-8 illustrates the test setup. The driving impedance is 25Ω. Figure 2-9 shows the transient response with CREFIN removed, Figure 2-10 shows the transient response with capacitor CREFIN=68nF assembled. In both cases the VOUT settling time is approximately 8µs. The configuration with the capacitor exhibits only a small overshoot.

Transient and Frequency Response Test Setup Figure 2-8 Transient and Frequency Response Test Setup
REFIN to OUT Transient Response (CREFIN not Assembled) Figure 2-9 REFIN to OUT Transient Response (CREFIN not Assembled)
REFIN to OUT Transient Response (CREFIN=68nF) Figure 2-10 REFIN to OUT Transient Response (CREFIN=68nF)