BUF802: Input offset voltage

Eddie Koh

Part Number: BUF802

Customer is using BUF802 in the standalone configuration. Their application does not need the DC performance on the BUF802 that the composite loop provides, so the standalone configuration will make their design much simpler.

It was noted that the input offset voltage is nominally -600mV from the datasheet, which is observed in simulation.

1. Does this degrade the output swing of the BUF802?

2. Is there a way to minimize or remove it, or is the only option to AC couple the output?

over 2 years ago

0 Nick Nauman over 2 years ago

TI__Expert 6050 points

Hi Eddie,

1. The output swing will not be affected by the input offset voltage of the BUF802. In order to achieve an output voltage of 0V, the input voltage must be 600mV. Therefore, in order to achieve the lowest output swing (Vs- + 3.4), the input voltage would need to be (Vs- +4). In order to achieve the highest output swing (Vs+ - 1.9), the input voltage would need to be (Vs+ - 1.3).

2. I recommend looking at these resources: SLOA059B and TI Precision Labs - Input Offset Voltage Video. These have good information about what input offset voltage is and how to compensate for it.

Please let me know if you have any other questions.

Thanks,

Nick