AFE for AD7768-4

Hi, I am attempting to design an analog input circuitry based on the AD7768-4. The application calls for a single-ended, AC-coupled input, with a range of +/- 8V. Max frequency is ~100kHz.

I am looking for suggestions/reference design for this particular application, specifically suggestions as to what front-end amplifier is suitable. I am also open to suggestions to use ADC chips other than the AD7768-4.

The end product is a portable vibration data logger, interfacing with IEPE vibration transducers. Any suggestions greatly appreciated.

Thanks.

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  • 0
    •  Analog Employees 
    on Jan 31, 2019 10:07 AM

    Hi,

    The recommended drivers for AD7768 are ADA4945-1, ADA4896-2, ADA4940-1 for Fast Power Mode; ADA4945-1, LTC6363, ADA4805-2 for Low Power Mode; and ADA4945-1, ADA4807-2, ADA4940-1 for Median Power Mode. The AD7768 can operate up to 5V analog supply so you have to design your AFE that will meet the AD7768 input specification. We have an application note for AD7768 AN-1384 that you may found helpful, but in terms of designing the AFE, I would also suggest to ask question to Amplifiers Community so more people from the community can help out. It is necessary to take note some important considerations in designing your signal conditioning to meet your required specifications. If you could also be more specific on the requirement may also help, that is the required offset, gain and noise level etc. for what you want to measure.

    Thanks,

    Jellenie

Reply
  • 0
    •  Analog Employees 
    on Jan 31, 2019 10:07 AM

    Hi,

    The recommended drivers for AD7768 are ADA4945-1, ADA4896-2, ADA4940-1 for Fast Power Mode; ADA4945-1, LTC6363, ADA4805-2 for Low Power Mode; and ADA4945-1, ADA4807-2, ADA4940-1 for Median Power Mode. The AD7768 can operate up to 5V analog supply so you have to design your AFE that will meet the AD7768 input specification. We have an application note for AD7768 AN-1384 that you may found helpful, but in terms of designing the AFE, I would also suggest to ask question to Amplifiers Community so more people from the community can help out. It is necessary to take note some important considerations in designing your signal conditioning to meet your required specifications. If you could also be more specific on the requirement may also help, that is the required offset, gain and noise level etc. for what you want to measure.

    Thanks,

    Jellenie

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