INA849: TINA Simulation for single supply

Chen Gao

Part Number: INA849
Other Parts Discussed in Thread: INA333

Hi,

I tried emulating the AFE circuitry according to the following application. (input: 32mVpp/300Hz, G=67)

I can get the expected results with INA 333/ 332 using following circuitry (single power supply 5V, offset input, offset Ref ) but not work for INA849 with single supply + input offset.

I attached the simulation files for both INA333 and INA849 ( W/ and W/O offset). Can you pls advice some recommendation ?

INA_Simulation.zip

over 4 years ago

0 kai klaas69 over 4 years ago

Guru 140200 points

Hi Chen,

the recommended supply voltage of INA849 is 8V minimum. See section 7.3 of datasheet. 5V as in your case is too low.

Kai

0 Chen Gao over 4 years ago in reply to kai klaas69

TI__Prodigy 375 points

Hi kai,

Actually I tried 12V single supply for the simulation not it won't work.

I am wondering if something wrong for the modeling or for the hardware circuitry.

+1 kai klaas69 over 4 years ago in reply to Chen Gao

Guru 140200 points

Hi Chen,

the datasheet says that the input voltage of INA849 must stay 2.5V away from the supply voltages. See section 7.5.

Kai

+1 Raymond Zhang1 over 4 years ago in reply to Chen Gao

TI__Guru* 77501 points

Hi Gao,

Here is an example of the circuit. As Kai indicated, you need to establish the proper Vcm for the input.

INA849 E2E 07272022.TSC

If you have additional questions, please let us know.

Best,

Raymond

0 Chen Gao over 4 years ago in reply to Raymond Zhang1

TI__Prodigy 375 points

Thanks all. The Vcm is the cause.

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INA849: TINA Simulation for single supply