LMP7721: Current Measurement

sasi kumar1

Part Number: LMP7721

HI,

We are designing a differential pulse stripping voltammetry, in that we are using LMP7721 as a trans-impedance amplifier we have gone through the datasheet but unable to find the current requirement level of that IC.

we like to know the sensing current range to be applied to the trans-impedance amplifier

over 5 years ago

0 Raymond Zhang1 over 5 years ago

TI__Guru* 77501 points

Hi Sasi,

Q: we like to know the sensing current range to be applied to the trans-impedance amplifier

The sensing current range is depending on the feedback resistor of the TIA configuration, see the application link below. The TIA Vout's transfer function is Vout = -RI_in, where I_in is the input current of a sensor application.

https://www.ti.com/lit/an/sboa268a/sboa268a.pdf?ts=1608139632474&ref_url=https%253A%252F%252Fwww.google.com%252F

https://www.ti.com/lit/ug/tidu535/tidu535.pdf?ts=1608223156929&ref_url=https%253A%252F%252Fwww.google.com%252F

Here is the current performance of the LMP7721 amplifier.

I am also including pH reference design, since you are doing voltammetry application

https://www.ti.com/lit/an/snoa529a/snoa529a.pdf?ts=1608146451650&ref_url=https%253A%252F%252Fwww.google.com%252F

https://www.ti.com/lit/ds/symlink/lmp91200.pdf?ts=1608224160863&ref_url=https%253A%252F%252Fwww.google.com%252F

If you have other questions, please let us know.

Best,

Raymond

Amplifiers

Amplifiers forum

LMP7721: Current Measurement