OPA356: OPA356

eDesign

Prodigy 30 points

Part Number: OPA356
Other Parts Discussed in Thread: LMH6624, , LOG300

Tool/software:

What about LMH6624 that is also very good amplifier and commonly used for Ultrasonic Amplifiers

3 months ago

0 Vikas Jeevannavar 3 months ago

TI__Expert 3005 points

Hi eDesign,

While both OPA356 and LMH6624 are a good choice for ultrasound NDT application, we have multiple amplifiers suitable for ultrasound applications which are optimized on different parameters. I would need few inputs from you to suggest a suitable amplifier.

Maximum input signal swing from sensor
Gain needed
Required bandwidth or maximum signal frequency
What is the ADC resolution

Thanks

Vikas J

0 eDesign 3 months ago in reply to Vikas Jeevannavar

Prodigy 30 points

Hello Vikas,

I am exploring for the similar project as below and regards to that I have asked for the LMH6624.

https://e2e.ti.com/support/amplifiers-group/amplifiers/f/amplifiers-forum/993200/opa356-amplification-for-ultrasonic-ndt-signal

Please find my comments on points.

1 >> Maximum input signal swing cab be restricted to 1V peak to peak.

2>> Gain 40 dB is ok for me.

3>> Up to 15Mhz preferable.

4>> ADC is not used. I am going to compare the signal with threshold level.

I am looking for cost effective solution, 3 VDC operating more preferable. It is going to operate on 2 AA battery so power consumption is also so much important.

Thank you very much

eDesign

0 Vikas Jeevannavar 3 months ago in reply to eDesign

TI__Expert 3005 points

Hi eDesign,

Thanks for the inputs. Are you looking for required bandwidth of 15MHz or max signal frequency is 15MHz?

As you saw in the previous e2e post, you can use LMH6624 if max signal frequency is 15MHz and you need a gain of 40dB. However, given that your application is battery powered, you could split the gain into multiple stages with OPA838 which is designed for high gain, low noise and power ultrasound front end.

Since, you are only interested in the threshold level and not the frequency information of the signal, we have released LOG300 which has integrated LNA and log detector exactly meant for your application. Here is the datasheet LOG300 40MHz, 98dB Logarithmic Detector With Integrated Low-Noise Amplifier datasheet and an app note for more information Ultrasonic Sensing Using LOG Detector Amplifier.

Thanks
Vikas J

0 eDesign 3 months ago in reply to Vikas Jeevannavar

Prodigy 30 points

Hello Vikas,

Thank you very much for your support. Yes that suggested IC LOG300 seems more promising !!

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OPA356: OPA356