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ADS1299 - Dual supply question.

Other Parts Discussed in Thread: ADS1299, ADS1298, TLE2426

Hi!

I wanna make a "portable" device using ads1299 (bipolar supply).

Although, I couldn't find much info about its current consumption, but in ADS1298 page I noticed there is a 2.5 mA supply current (Typ) for AVDD.

In the ADS1299 datasheet it says the maximum input current (Continuous) is 10mA, so I assume the device works below that.

I was thinking of using a main battery of 9V to get it done:

9V >>  5V (L7805) >> +- 2,5V (TLE2426)

In FAQ section I found this:

e2e.ti.com/.../1461

He says he used a TLE2426 to get the +- 2,5V. Although it can output 20-40mA maximum (which would make the system work).

I realize that using an Alkaline 9v battery (PP3) wouldn't be the best, but as long as the system can work for as little as 10 minutes with a fresh battery, that's fine. I just want to evaluate if this configuration is going to work or not.

Thanks!