MIC Preamp alternatives for INA163

Thomas Bollinger

Other Parts Discussed in Thread: INA217, INA163, LME49743, INA103, PGA2500, PGA2505

I am working on a multichannel balanced audio input circuitry.

The balanced audio input should be universal to allow greatest input level flexibility.

It should support MIC input levels and standard balanced levels up to +24dbu. Analog switches will be used to select the different gain and attenuation settings.

I am wondering if there are good alternatives for INA163 and INA217.

I understand that LM49724 can load down the input source because of the gain-setting resistors.

I also understand the 3 parts of LME49743 (Datasheet Figure 43) can do the same job as INA163 at slightly worse noise performance (3.5 nV/√Hz instead of 1 nV/√Hz for INA613). The advantages are lower cost and smaller footprint.

Can you recommend any other MIC preamp with acceptable CMR and noise performance?

Thanks

Thomas

over 10 years ago

0 Don Dapkus over 10 years ago

TI__Guru**** 189399 points

Hi, Thomas,

The INA devices are supported out of our Precision Analog forum. I am going to move your post there.

-d2

0 Pete%20Semig over 10 years ago

TI__Mastermind 25805 points

Hello Thomas,

I support devices with the "INA" prefix. The only other "INA" device that I know of that may work for you is the INA103. Please let me know if you have any questions about the INA devices.

0 Bruce Trump over 10 years ago in reply to Pete%20Semig

Guru 21975 points

Thomas,

You may want to consider the PGA2500 or PGA2505. These devices are intended for Low-Z microphone inputs have digitally controlled gain. This would greatly simply the gain switching in high gains all the way down to G=1. You would need to switch in an input attenuator to handle +24dBu input.

Bruce

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MIC Preamp alternatives for INA163