INA240-Q1: INA240-Q1

Giridhar N

Prodigy 180 points

Part Number: INA240-Q1
Other Parts Discussed in Thread: INA240

Hi Team,

I am using INA240A1-Q IC in my project.

Circuit:

Shall i use Rs ( R0505 & R0506) value from 330 ohm (>300ohm) in place of 30 ohms ??
Are these values impacting the any gain error and CMRR value?? Are there any other parameter effects?

For 30.01 ohm ==> Common mode cut-off frequency = 241MHz and Differential mode cut-off frequency = 12.06MHz.
For 330 ohm ==> Common mode cut-off frequency = 21.9 MHz and Differential mode cut-off frequency = 1.10MHz.

over 2 years ago

+1 kai klaas69 over 2 years ago

Guru 140200 points

Hi Giridhar,

section 9.1.1 of datasheet answers your question.

Also keep in mind that the added protection diodes can introduce an unwanted imbalance between the inputs caused by uneven junction capacitances. This can degrade the common mode rejection of INA240.

Kai

0 Guang Zhou over 2 years ago

TI__Mastermind 34960 points

Hi,

As Kai mentioned, larger input resistors can have some impact to accuracy. Therefore it is a good idea to keep them reasonably small, unless it is not an option

Regards, Guang

0 Giridhar N over 2 years ago in reply to kai klaas69

Prodigy 180 points

Hi Kai,

Thank you for the quick response.

Regards,

Giridhar.

0 Giridhar N over 2 years ago in reply to Guang Zhou

Prodigy 180 points

Hi Guang,

Thank you for the your response.

Regards,

Giridhar.

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INA240-Q1: INA240-Q1