AD7711, AD7785, AD7792, AD7794 Specifications

Hi,

I would like to know MAX values for the specifications of the four ADCs below.

Please tell me these value.

ADCs
・ AD7711
・ AD7785
・ AD7792 / 93
・ AD7794 / 95

Specifications
・ Offset Error (max)
・ Ofset Error Drift vs Temperature (max)
・ Full-Scale Error (max)
・ Gain Drift vs Temperature (max)

Best regards,
Yuya



Shortage addition
[edited by: Yuya at 12:40 AM (GMT 0) on 30 Apr 2020]
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  • 0
    •  Analog Employees 
    on Apr 30, 2020 4:11 AM

    Hi Yuya,

    These are old products and the datasheet only specified the typical values. Let me check if we have data for max values. May I know what is your applications? We usually recommend newer products if it is for new designs, and the recommended replacement for the above parts are AD7124-4/AD7124-8 B grade. It has all the building blocks of the above ADCs with a better performance.

    In terms of the errors above, I think performing calibrations should remove those errors. If you could provide more details about the applications then that would be great,

    Thanks,

    Jellenie

  • Hi, Jellenie

    Actually, it is a project that my customers are considering, so I cannot publish the details of the application here.

    I also think that the new product is good, and I am proposing the AD7124-8, but the customer is considering it widely.

    If you have the maximum data, I would appreciate it if you could let me know.

    Best regards,

    Yuya

  • 0
    •  Analog Employees 
    on May 4, 2020 2:20 AM in reply to Yuya

    Hi,

    I'm not sure if we have data for max values, but in terms of offset and gain error, the errors can be minimize in the order of the noise when performing system calibrations. AD7124 offers this calibration mode. The AD7124 has low offset and low gain drift. To minimize drift errors it is also advisable to perform calibrations every time that the channel, gain and temperature is change.

    The AD7124 has 4 calibration modes. Internal offset and gain error calibrates the drift performance of the ADC. This is usually done to fine tune offset and gain error when it is exposed across temperature range. A one time internal calibration after power up would be sufficient. Meanwhile the System calibration compensates for offset and gain from the front end and external circuitry. Some of these external component drift across time, for example a load cell in the front end accuracy drift and need to perform system calibration to fine tune offset and gain cause by the drift.

    Thanks,

    Jellenie

  • Hi,

    I understand that the AD7124-8 excels. I also understand that calibration can also minimize errors.

    However, my customer wants to know whether there is maximum value data of the electrical characteristics of the AD7711, AD7785, etc. Also, if there is data, I would like to know the value as well.

    Did you find the data?

    If you do not have the data, please reply that there is no data.

    Best regards,

    Yuya

  • +1
    •  Analog Employees 
    on May 11, 2020 12:44 PM in reply to Yuya

    Hi

    Apologies. I can't find max value data for older products mentioned above. Most of them are specified at typical values only.

    If in case that these errors are affecting their measurements. It is worth suggesting them the calibration procedure and the product recommendation AD7124 with better offset and gain errors. It could possibly help them to less worry about the maximum specs that they have requested.

    Thanks,

    Jellenie

  • Hi,

    Thank you for confirmation.
    I understood that there was only typical value.

    Best regards,

    Yuya

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