ISO224: Noise issue at the Differential Output

Hi Jyothish,

Have you added any input or output filtering? Can I please see your input, your output with the observed noise, and a schematic/layout of your project? Then I will be able to better advise.

Thank you,

Eva

Hi Jyothish,

Thank you for the information. If the input appears noise free, next you could check whether the power supplies are noise free. You could also add output filtering to help mitigate the noise. Do you have a layout picture as well?

Best regards,

Eva

I have tried acquiring the power supply voltage also, it came leass than 2mv

Hi Jyothish,

What is the input signal you are applying? Have you added any output filtering yet?

Best regards,

Eva

The input is 1VDC and no filtering used for the input.

Hi Jyothish,

If there is no noise on the input, but noise on the output, please add filtering to the output as suggested. Ensure you are operating within the recommended operating conditions and use the suggested power supply values. Also ensure you are using separate grounds on the high-voltage and low-voltage sides. I can further advise if you share the layout and input signal waveforms. 

Thank you,

Eva

While output filtering is generally discouraged due to the presence of 10 kHz signals, I plan to implement a filter for testing purposes. Could you recommend a standard cutoff frequency for the specific Texas Instruments IC.

The grounds are separate for the input as well as output and power supply are as per the operating condition range.