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ADS131A04: ADS131A04 design related consultation

Vayne Li
Intellectual 640 points
Part Number: ADS131A04

Tool/software:

Hi Teams,

Can I connect the ADS131A04 to a single ended signal with a voltage of -1.5V~1.5V? Can I use a single power supply for the ADC?

If possible, should the ADC be set to single ended? How should it be connected? I have external sensors that output -1.2V~1.2V, but there are few peripheral circuits and space limitations.

  • 0
    TI__Mastermind 42445 points

    Hi Vayne,

    Yes, ADS131A04 can be used to measure a bipolar signal under the ground, like -1.5V~1.5V you mentioned. What you need to do are:

    1. Provide 3.3V clean power supply to AVDD of the ADC.
    2. Enable internal negative charge pump by setting VNCPEN bit to 1 in the A_SYS_CFG register.
    3. Select a reference source by setting the INT_REFN bit. By default, external voltage reference is selected.

    For hardware connection, you only need to apply your signal to INxP pin, and short INxN pin to your ground. The figure 102 in the datasheet shows an application example for voltage measurement ( You can ignore the 'Neutral' that is used in a metering application).

    BR,

    Dale

  • 0 in reply to Dale Li
    Intellectual 640 points

    Hi Dale,

    Thank you for your reply!

    Let me ask another question, what is the reference voltage for a single power supply of 3.3V can measure -1.5V~1.5V？

  • 0 in reply to Vayne Li
    TI__Mastermind 42445 points

    Hi Vayne,

    You can select the internal reference voltage 2.442V. The external reference voltage range is 2.0~AVDD – 0.5.

    BR,

    Dale