• State Resolved
  • Locked Locked
  • Replies 2 replies
  • Subscribers 46 subscribers
  • Views 615 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

ADS1158: How do I make -2.5V?

Danny Kim
Intellectual 300 points
Part Number: ADS1158
Other Parts Discussed in Thread: LM7705, LM27762

Hello

I'm working on a schematic with ADS1158.

However, ADS1158 uses -2.5V as REFN, AVSS.

Please let me know how I can make -2.5V.

Should I use the  LMC7600?

Thank you

  • 0
    TI__Mastermind 44680 points

    Hi Danny,

    The 5V analog supply for the ADS1158 can be from a bipolar +/-2.5V source, but it can also tolerate a unipolar 5V supply (AVDD =5V, AVSS = GND) if that is easier to implement in your design. However, if your input amplifier needs to be able to drive down to 0V, then some kind of negative supply will be required (at least for the amplifier).

    The LMC7600 could probably work, but you might also consider the LM27762 (which can generate both +/ 2.5V supplies and integrates LDOs to reduce the supply noise), or if you only need a negative supply for the amplifier you could use something like the LM7705 to generate the negative supply rail for the amplifier.

  • 0 in reply to Christopher Hall
    Intellectual 300 points

    Hi Christopher

    Thank you for introducing IC

    I will try the LM27762

    Thank you