INA214-Q1: To change gain 90

Luke Park

Part Number: INA214-Q1

Tool/software:

Hi, Team

One of my key customer, KyungShin need 90 Gain INA part. So INA214-Q1 is closest part and asking how to change gain to 90.

we know INA214-Q1 has 100 Gain. customer wants to change it as 90. So 1kohm is inserted at +in/-in as shown below picture.

Is this schematic is possible to be 90 GAIN from INA214-Q1? if not, can you recommend?

2 months ago

0 Levi DV 2 months ago

TI__Expert 8095 points

Hello,

The simplest way to change the total gain of the system would be to change the shunt resistor. If the shunt resistor is 90% of the current value, then it will be equivalent to having a gain of 90 from the amplifier.

Let me know if you have any more questions,

Levi DV

0 Luke Park 2 months ago in reply to Levi DV

TI__Prodigy 695 points

Hi Levi

Thanks for your comments.

Do you think adding 1kohm at IN+/IN- is not right solution?

0 Levi DV 2 months ago in reply to Luke Park

TI__Expert 8095 points

Hello,

No, adding resistance on the inputs of the device can be detrimental to the device operation and can cause the device output to have an increased error due to the voltage drop across the 1kΩ resistor.

Levi DV

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INA214-Q1: To change gain 90