INA149: INA149

DRUILHE yvan

Part Number: INA149
Other Parts Discussed in Thread: TINA-TI

Hello,

For component INA149, can you give me the mathematical equations that calculate the differential impedance of 800K and common mode 200K
Thank you
Best regards.

over 5 years ago

0 Marek Lis over 5 years ago

TI__Guru 63740 points

Yvan,

Below please see the circuit configuration and simulation results of INA149 common-mode and differential input resistance.

0 DRUILHE yvan over 5 years ago in reply to Marek Lis

Intellectual 500 points

Hello,

Yes the simulation is correct, but can you to give me the equations for Zdiff = 800K and Zemc = 200K ?

Thank you for your help.

0 DRUILHE yvan over 5 years ago in reply to DRUILHE yvan

Intellectual 500 points

Can you please to send me design TINA for simulation.

I don't undertstand

I dont understand this simulation.pdf

0 Marek Lis over 5 years ago in reply to DRUILHE yvan

TI__Guru 63740 points

Yvan,

Attached please find the simulation file and free Tina-TI simulation tool used to simulate the common-mode and differential input resistance. VCVS with gain of G=-1 is used to drive the differential input of INA149 with two equal magnitude signals, which are 180 degrees out of phase, so the input common-mode voltage stays at zero.

e2e.ti.com/.../INA149-Rin_5F00_diff-and-Rin_2D00_cm.TSC

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INA149: INA149