ADS42LB69: DC-Couple Circuit for ADS42LB69

sina kamkar

Part Number: ADS42LB69
Other Parts Discussed in Thread: ADS54J60, THS4509, LMH6554

Hi everyone,

I am designing a FMC Board based on the TI ADS42LB69 Dual Channel 16-Bit 250 MSPS.

In Time-Domain, Low-Frequency Pulse Application, Datasheet Recommended Application report SBAA220 to compensate for the analog buffer response. But, I do not know how to use the circuit in the ِDC-Couple channel.

Now, I need a Complete DC-Couple Circuits to the analog input ADC.

Is there it ?

Thanks for Attention.

over 7 years ago

0 dBrock over 7 years ago

TI__Genius 12780 points

Hi Sina,

We are taking a look into this, and will be back with you soon.

Best Regards,

Dan

0 sina kamkar over 7 years ago in reply to dBrock

Intellectual 435 points

Hi Daniel Brock36, Thanks, I'm waiting for your answer.

0 dBrock over 7 years ago in reply to sina kamkar

TI__Genius 12780 points

Hi Sina,

Thank you for your patience. We are still working on a solution for your request.

Best Regards,

Dan

0 jim s over 7 years ago in reply to dBrock

TI__Guru* 91947 points

ADS42LB69 app note.docxSina,

See attached file for help with this.

Regards,

Jim

0 sina kamkar over 7 years ago in reply to jim s

Intellectual 435 points

But, I need Evaluation Schematic Analog Input DC-couple For ADS42LB69 that Optimize it.
Is There it ? (for Example Analog Input FMC164 Board)

0 jim s over 7 years ago in reply to sina kamkar

TI__Guru* 91947 points

Sina,

Do you plan on using an amplifier for this application? If so, the high speed amplifier group can probably provide you with some examples.

Regards,

Jim

0 sina kamkar over 7 years ago in reply to jim s

Intellectual 435 points

Yes, Can you suggest a Analog Input DC-Couple circuit schematic for ADS42LB69?
I appreciate any helps.

0 jim s over 7 years ago in reply to sina kamkar

TI__Guru* 91947 points

7462.tidub15.pdfSina,

Attached is an example we did with a ADS54J60. This could work with the ADS42LB69 as well.

Regards,

Jim

0 sina kamkar over 7 years ago in reply to jim s

Intellectual 435 points

Hi Jim,
Can this DC-couple circuitry (Base-on LM6401) offer the best function for ADS42LB69 ?
Using this DC-couple circuitry (Base-on LM6401) and assuming that the clock circuit and Design PCB is ideal (RMS Jitter < 120 fs) , Can I achieve SNR above 70 dB ?

0 Rohit Bhat over 7 years ago in reply to sina kamkar

TI__Genius 15975 points

Hi Sina,

For driving the ADS42LB69, I would recommend using either the THS4509 or the LMH6554 in-order to achieve an SNR > 70-dB.

I would recommend looking at the following design guide using either THS4509 or LMH6554 for your application. The design guide shows 70-dB SNR using 1st Nyquist zone low pass filter at ~120MHz, which should be applicable for driving the ADS42LB69 as well.

1. www.ti.com/.../tidu173.pdf
2. www.ti.com/.../tidu172.pdf

Best Regards,
Rohit

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ADS42LB69: DC-Couple Circuit for ADS42LB69