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ADS1118: How to Measure Related Parameters

Depeng Man
Intellectual 2030 points
Part Number: ADS1118

Hello Team,

My main problems are as follows:

I'm using TI's 16 bit high precision ADC chip. The name of the chip is ADS1118IDGSR. At present, I want to test the static and dynamic parameters of this chip.

Static parameters include DNL, INL offset error, and Full scale gain error

Dynamic parameters include:THD SINAD ENOB SNR SFDR

My current questions are as follows:

1. I see that your website has this evaluation board for ADC. Can I apply for one piece for free in the name of the company? The links are as follows:

www.ti.com.cn/.../ADS1018EVM -everything&usecase=hardware

2. I don't have an evaluation board now, but I still want to test these parameters. Ask me how to build a test platform, what test instrument to use, what are the test steps, and what are the test results? (I don't want to see the instructions in English, but it's better to have them in Chinese)

3. If our company does not have these test equipments, I would like to go to an outside institution to test them. Can you help us see where in Nanjing can ADC parameters be tested?

Appendix 1 is the specification for this ADC and Appendix 2 is the specification for the EVM demo board.

Thank you.

  • 0
    TI__Mastermind 18900 points

    Hello Depeng,

    At a high level, I find this to be an interesting request. The datasheet guarantees most of these parameters in the electrical characteristics tables. In fact, we measure these parameters on every single device with test equipment before shipping them out to a customer. If a device doesn't meet the spec, we throw it away. Therefore, it is redundant to measure it on something like the EVM. If you were to do it a real system it might make some sense but I would have assumed that you already had a testing infrastructure before that step.

    Is there something that the datasheet does not cover? Or is this an exercise to double-check known parameters against the datasheet to validate your test methodology?

    In other words, I don't see value in the request. However, I will help you the best I can.

    The first is to review the parameters if you are not very familiar with them in the context of ADCs. This can be found on the TI Precision Labs (TIPL) video series with the following videos. The high level goal of the test should be obvious after reviewing these videos:

    The difficult steps relate to ensuring your test equipment (and hardware, such as EVM layout) does not interfere with your testing, and calculating the values themselves.

    For calculating the values, you should be able to calculate a lot of the AC specifications using the GUI and EVM. There is an analysis page that should calculate the numbers for you. Using the https://www.ti.com/tool/ANALOG-ENGINEER-CALC there is also a page that will help you calculate the parameters based on ADC data you collect.

    For test equipment, it kind of depends but the audio precision can help with providing a clean AC input signal: https://www.ap.com/analyzers-accessories/apx555/ . Think there are even logic analyzers that might be able to help you calculate those parameters.

    I'll email you directly about question 1.

    Best,

    -Cole