ADS42B49: How to design driver circuit using amplifier

Lu Wong

Part Number: ADS42B49

Hello!

I would like to use ADS42B49 to convert analog signal to digital signal. The analog signal is weak, so the driver circuit I use is an amplifier rather than transformer.

But the EVM of ADS42B49 and datasheet only provide reference design with transformer as driver circuit. So I'm writing to you to ask if you could provide me the reference

design of amplifier as driver circuit of ADS42B49. Actually, I need a digitally controlled gain amplifier, and I want to know how to link DGA and ADC.

Any help would be greatly appreciated, thanks in advance.

over 5 years ago

0 Yusuf%20Agoro over 5 years ago

TI__Expert 4880 points

User,

I forwarded your question to a device expert. He should get with you shortly.

Thanks

Yusuf

0 jim s over 5 years ago

TI__Guru* 91947 points

User,

Go to the ADS42B49EVM product folder on the TI website and download the board design package files. This EVM has an example of an amplifier interface to the ADC.

Regards,

Jim

0 Lu Wong over 5 years ago in reply to jim s

Prodigy 40 points

Hi Jim,

Thanks for your reply!

I've checked the EVM design file of ADS42B49EVM. But it seems not the amplifier interface as the picture shows below.

My regards,

Luella

0 jim s over 5 years ago in reply to Lu Wong

TI__Guru* 91947 points

Luella,

This board has the option to either use a transformer or amplifier by just moving a few resistors (see below). Not sure what your question is and why your schematic view you sent does not show this.

Regards,

Jim

0 Lu Wong over 5 years ago in reply to jim s

Prodigy 40 points

Jim,

I'm very sorry that I didn't notice the amplifier circuit below. It was my fault.

Thanks for your kind reminding!

Best regards,

Luella

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ADS42B49: How to design driver circuit using amplifier