AD811 as I/V stage for current DACs (and test some other op amps including Burson Audio op amps as I/V)

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terranigma

terranigma

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Joined 2007
audiosteve said:
After a quick look at the data sheet of the LME49720, the specs are indistinguishable from an LM4562. I'm talking about exact same numbers! It's uncanny. I wonder if they are the same part? In any case, I've been a big fan of the sound of the LM4562 for a number of years so I will have to try that in my I/V stage. I never thought of doing that. Right now my DAC in progress will use an AD811. Thanks for the tip.
Click to expand...
On paper, they seem same. As I mentioned above, you should try metal-can version. Just give it a try.
 
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diyiggy

diyiggy

Member
Joined 2019
+1 for the lme49713 metal can, yupI know it is ad811 big brother.
I wanted to wait a GB at Rocester on another thread to ask people to buy some. Rocester is very expensive from Europe cause taxes everywhere.
This LME 49713 is said to be a good buffer for cans too.
This time Grunf sends me a skud

Consider also the AD8597 as a buffer (a very good cheaper alternative to AD797).
;)
 
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grunf

grunf

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Joined 2006
Guys, have you heard about popcorn noise that can appear with LME49720 or LM4562? I have never used them, so I have no experience with that problem , but there were a lot of complaints against TI because of it.
https://e2e.ti.com/support/audio-group/audio/f/audio-forum/725471/lme49720-popcorn-noise
https://e2e.ti.com/support/audio-gr...um/415907/lm4562-lme49720-low-frequency-noise
https://e2e.ti.com/support/audio-gr...20-excess-popcorn-noise-issue/3385884#3385884

As for the LME49713, it was not considered for testing because it is obsolete (although it can be obtained in Rochester) and because of the higher input impedance compared to the AD811.
Otherwise I have no doubt that both op amps sound good.
 
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diyiggy

diyiggy

Member
Joined 2019
audiosteve said:
The LME49720 is not avaiable in a metal can from Rochester but the the LME49713HA is available. The downside is that the minimum order at Rochester is 250 USD. I have an account and I will get some if enough people will go in on a group buy. Who wants in? Should I start a group buy in swap meet?
Click to expand...

If so, counts me in for 4 units. Boberly loved it. and also it makes an excellent buffer for cans or low Z input pre.


58 Z VS 14 Z ... we are low enough, And you have better specs on CMR and PSRR, better input noise and a very good Intermodulation distorsion, as well as that metal can good for thermal cooling as a CFB and shielding !

+1 for the bad emc/emi behavior of the lm4562 as said already everywhere.
 
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