INA183: Current output device

Naizeng Wang

Expert 4100 points

Part Number: INA183
Other Parts Discussed in Thread: INA138, INA139, INA169, INA168

Hi team,

The output signal of INA183 is voltage, do we have device with current output propotional to sensed voltage?

Nison

9 months ago

0 Peter Iliya 9 months ago

TI__Mastermind 28525 points

Hello Nison,

The only pure current-output, current-sense amplifier we have are INA138, INA139, INA168, INA169, and INA171.

The only other alternative to these devices is to configure a voltage output device into a current output using the Howland Current pump architecture specifically with an op amp buffer in the feedback to REF pin. These links below describe how to design these circuits.

https://www.ti.com/lit/an/sboa358/sboa358.pdf?ts=1619563437533&ref_url=https%253A%252F%252Fwww.google.com%252F

https://www.ti.com.cn/cn/lit/an/sboa513/sboa513.pdf?ts=1625166144274&ref_url=https%253A%252F%252Fwww.google.com%252F

Sincerely,

Peter

0 Naizeng Wang 8 months ago in reply to Peter Iliya

TI__Expert 4100 points

Hi Peter,

Which one should I choose, INA138 or INA139? What's the design consideration on choosing the device?

0 Peter Iliya 8 months ago in reply to Naizeng Wang

TI__Mastermind 28525 points

Hey Naizeng,

It depends upon what the system requirements and boundary operating conditions are.

You can see a side by side of the device electrical characteristics below. The main differences between INA138 and INA139 are their transconductance, max operating Vcm, IQ, IB, Vos, and output swing to rail.

Sincerely,

Peter

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INA183: Current output device