LME49724: compatability with DAC differential output to be used as balanced cable driver

Mark Thompson2

Part Number: LME49724
Other Parts Discussed in Thread: OPA1637

Hi there,

I was looking through the LME49724 datasheet, and figure 53 gives a nice example of pairing the LME49724 for an ADC input, however, I'm after some assistance to design this product into my circuit so it can act as a balanced cable driver at the output of my differential DACs.

My DACs are for a balanced audio application. They have 24-bit resolution, a full-scale output voltage of 1.76 Vrms (4.96 V p-p), and a common-mode reference output of 1.5 V.

Can you please help me with a product recommendation and design recommendation to achieve my requirements?

Many thanks!

Mark

over 3 years ago

0 Ivan Salazar over 3 years ago

TI__Guru** 102355 points

Hi Mark,

I'm checking along with other teams for further recommendations, will get back to you with some options by tomorrow.

Best regards,
-Ivan Salazar
Applications Engineer

0 Mark Thompson2 over 3 years ago in reply to Ivan Salazar

Intellectual 620 points

That's great! Thanks, Ivan. I look forward to hearing back from you and your team!

0 Ivan Salazar over 3 years ago in reply to Mark Thompson2

TI__Guru** 102355 points

Hi Mark,

Sorry for late response, I'm still looking into this.
This and other tasks taking longer than planned, will try to send some further comments as soon as possible.

Best regards,
-Ivan Salazar
Applications Engineer

+1 Ivan Salazar over 3 years ago in reply to Ivan Salazar

TI__Guru** 102355 points

Hi Mark,

You may look into OPA1637, most of line drivers at Audio portfolio are single-ended, so it would be a better idea to look into op amps rather than line-drivers.

Best regards,
-Ivan Salazar
Applications Engineer

0 Mark Thompson2 over 3 years ago in reply to Ivan Salazar

Intellectual 620 points

Thanks, Ivan. I'll look at the spec's for the device now. I'm assuming it would be recommended also based on my description in my initial post?

Kind regards,

Mark

0 Mark Thompson2 over 3 years ago in reply to Mark Thompson2

Intellectual 620 points

Hi Ivan, it appears that device accepts lower voltage inputs (~0.5V). Is there a similar device that can accept higher audio input voltages?

Thanks,

Mark

0 Ivan Salazar over 3 years ago in reply to Mark Thompson2

TI__Guru** 102355 points

Hi Mark,

Your input voltage range is based on your supply voltage.
There must be a typo in Abs Max Ratings table, it should be based on Vs, not +/-0.5V by itself.

Best regards,
-Ivan Salazar
Applications Engineer

0 Mark Thompson2 over 3 years ago in reply to Ivan Salazar

Intellectual 620 points

Aha! That makes much more sense! Thanks for confirming, Ivan!

0 Ivan Salazar over 3 years ago in reply to Mark Thompson2

TI__Guru** 102355 points

No problem, let us know if there are further questions.

Best regards,
-Ivan Salazar
Applications Engineer

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LME49724: compatability with DAC differential output to be used as balanced cable driver