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OPA1632: Output clipping

Sia Rezaei
Prodigy 60 points
Part Number: OPA1632

Tool/software:

Hi,

I'm testing a simple test circuit with this chip. It is a differential amp.

  1. Input resistors are 5.6k and feedback resistors are 11.3k.
  2. Both inputs and outputs are isolated with capacitors, so no DC current.
  3. There is only a 10k load resistor across the outputs
  4. Supply voltage is 28V

I'm seeing that the opamp clips at ~17V peak-to-peak (i.e. ±8.5V). At this voltage the current is 1.7mA. 

According to Figure 6-9 in the datasheet, the opamp should be able to output >25Vpp with a 10k load.

Since my supply is  ±14V, I expect it to be able to output at least  ±11V, what gives?

(without the 10k load it does not clip.)

Thanks,

  • 0
    TI__Mastermind 22494 points

    Hello Sia,

    Good question; let me take a look at this issue for you.  I appreciate you sharing your circuit setup details and information for me to consider.

    I agree that you need to find resolution here with the circuit performance.

    Best,

    Alec