DAC5687: Toggle between Unipolar and Bipolar output

Hi Nishie,

Just to clarify your question, are you referring to unipolar as single-ended output? And bipolar as differential output?

Please advise.

Thx,

Rob

Hi Rob-san,

Like the DAC81404, the unipolar output is 0V to +xV, and the bipolar output is -xV to +xV.

https://www.ti.com/lit/ds/symlink/dac81404.pdf

Best Regards,

Nishie

Hi Nishie-san,

This type of device is much different from the high speed DACs we have to offer, as this device has an integrated output buffer that allows for these two types of voltage output swings.

It might be best to use the parametric tables on TI.com to narrow down the DAC of choice. Otherwise, we can have an offline discussion with HSC marketing to better understand your requirements.

Please advise.

Regards,

Rob

Hi Rob-san,

Thank you. I will check offline for the best device.

Best Regards,

Nishie

Hi Rob-san,

I have something to add.

There was a change in the customer's required specification. Do you have a product that meets the following specifications?

・Parallel interface
・Sampling rate: 125 MHz or higher
・Resolution: 14bit and 16bit
・Number of channels: 2~4
・Output: bipolar (± output)

I sorted as follows, but I could not find any product that can produce ± output.

https://www.ti.com/ja-jp/data-converters/dac-circuit/high-speed/products.html#84=14%3B16&1345=2%3B4&1498=Catalog&1918=Parallel%20CMOS%3BParallel%20LVDS%3BSPI&sort=1130;asc&

Best Regards,

Nishie

Nishie,

Sorry for the delay, for a +/-output level swing requirement, then the customer will need to use an amplifier on the output of the DAC.

Regards,

Rob

Hi Rob-san,

Thank you for letting us know that OPAMP is required.

We would appreciate it if you could tell us the combination of DAC and OPAMP that meets the requirements.

・Parallel interface
・Sampling rate: 125 MHz or higher
・Resolution: 14bit and 16bit
・Number of channels: 2~4
・Output: bipolar (±15V)

Best Regards,

Nishie

Hi Nishie,

What is the highest and lowest frequency needed for your application?

I assume you are AC coupled to the output, correct?

Thanks,

Rob

Hi Rob-san,

Sorry for the late reply. I will ask the customer about frequency and AC coupling.

Best Regards,

Nishie

Ok Nishie, please keep us posted.

Thanks,

Rob

Hi Rob-san,

I would like to tell you about the customer's specifications via private message.

I have sent you a friend request, please approve it.

Best Regards,

Nishie

Hi Nishie,

Please use email and we can close this post. That way would be more efficient.

Regards,

Rob

Hi Rob-san,

Thank you for your support.

Could you tell me your email address?

Best Regards,

Nishie