INA199: Hi Frequency Current Application

user6083619

Prodigy 180 points

Part Number: INA199

Hi Ti.

I'm designing current sense circuit.

I want to sense 1~2MHz AC frequency.

But INA199 is available until 10kHz , I think.

Do you have another product which is suitable for me?

If you don't have, I'll try by using OPAMP ( ex TL9152 ) alternatively.

Can I ask you any advises or attention in this case?

Sincerly.

Yuzuru.

over 5 years ago

0 Carolus Andrews over 5 years ago

TI__Mastermind 23355 points

Dear Yuzuru,

Thanks for choosing the TI! Unfortunately, the fastest part we have available in the current sensing amplifiers portfolio is the INA293, which tops out at a bandwidth of 1MHZ, so if you need to sample signals of 2MHz, this won't work for you.

I'm looping in our HSAMPS team to help make a recommendation here, but to help them along, can you let us know some details about your system?

- Supply Voltage(s)

- Input Signal voltage range

- Desired Gain for the system

0 user6083619 over 5 years ago in reply to Carolus Andrews

Prodigy 180 points

Hi Carolus.

Thanks for your reply.

I'll tell you my circuit details.

1. Supply Voltage　-3.3V/+3.3V (BiDirection)

2. Input Signal Voltage Range(Differential) ±1Vp0. ( approximately. I'll try to determine through test circuit evaluation. )

3.Desired Gain : 0～10dB ( approximately. I'll try to determine through test circuit evaluation. )

Sincerly.

Yuzuru

0 Tamara M Alani over 5 years ago in reply to user6083619

TI__Genius 10850 points

Hello Yuzuru,

Thank you for your post, I can help you. We have a few instrumentation amplifiers with BW > 2MHz, please take a look here: https://www.ti.com/amplifier-circuit/instrumentation/products.html#p480=1&p1181typ=2;6

0 kai klaas69 over 5 years ago in reply to user6083619

Guru 140200 points

Hi Yuzuru,

what shunt do you want to use?

Can you show a schematic or a schematic sketch?

Kai

0 user6083619 over 5 years ago in reply to kai klaas69

Prodigy 180 points

Hi Kai.

Thank you for your kindness.

This question have been resolved, because I found TINA is very useful!

I didn't understand how shunt circuit work at that time.

TINA resolved my question through schematic simulation.

Sincerly.

YUZURU

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INA199: Hi Frequency Current Application