INA4290: Termination of unused pin

Muhammad Fariz Bin Nor Azhar

Prodigy 70 points

Part Number: INA4290

Hi TI,

What termination should be made for the unused pin of this current sense amplifier?

Thank you.

Best regards,

Fariz

over 1 year ago

0 kai klaas69 over 1 year ago

Guru 140200 points

Hi Fariz,

I would connect both inputs of the channel in question to the supply voltage of INA4290.

Kai

0 Peter Iliya over 1 year ago

TI__Mastermind 32205 points

Hey Fariz,

I am looking this over and will respond shortly.

Best,

Peter

0 Peter Iliya over 1 year ago in reply to Peter Iliya

TI__Mastermind 32205 points

Hello Fariz,

So you could simply short the input pins and float them, but their Vcm will drift and this could create some offset error in the channel you are using via the device’s 140 dB typical channel-to-channel ratio. This offset error is small, even with the maximum 120V difference between the two channels, this only results in +/-12uV = 120*10^(-140/20) of input offset error.

You can negate this error by shorting the unused input pin to the same bus voltage output f the other channels.

Sincerely,

Peter

0 Muhammad Fariz Bin Nor Azhar over 1 year ago in reply to Peter Iliya

Prodigy 70 points

Thank you for your advice Peter and Kai.

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INA4290: Termination of unused pin