| MRehorst |
LMH6624 - Ultra-low Noise Wideband Op Amp
* 1.5 GHz Gain Bandwidth Product
* 0.92 nV/ rtHz Input Voltage Noise
* Low DC Errors: 100 µV V os , ±0.1 µV/°C Drift
* Low Distortion: -65/-80 dBc HD2/HD3 @ 10 MHz
* Applications: high-resolution applications, communications,
xDSL, audio, medical and instrumentation markets.
* Link to Product Folder/Free Samples:
Link
MR |
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| janneman |
Good tip Mark, thanks.
Jan Didden |
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| peranders |
I wonder how this opamp is in the audio perspective? Is it suited (well-suited) for audio or is it better for HF applications?
Many parameters have impressive data but it's not the same thing as good for audio. Notice also that this chip is really small, SOT-23!
Just wondering. :scratch: |
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| fmak |
[QUOTE]Originally posted by MRehorst
[B]LMH6624 - Ultra-low Noise Wideband Op Amp
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Looks good; pity it's confined to +-6V. Does anyone know how it sounds? |
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| halojoy |
What is the price?
I guess it costs more than NE5534 :cool:
It does not come in normal DIL, but in SO8 package.
It is for small signals and has slewrate 300MHz.
Supply voltage is only +- 6V
Etreme dc-offset precision performance.
It is not mainly intended for Audio-band.
But might be useable in some mic/riaa amplifier
as it has only 0.9nV/-Hz. Like AD797.
I will read some more from the PDF.
/halo |
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| Ilianh |
I wonder about using it with single supply...
and +\- 6v is that bad? I think thats enough for most of the signals we work with..
And opamps of this generation can saturate preety close to the supply rails...
still......
I'll order some samples for fun.
btw, any ideas whats the best opamp made by national, for audio (lm833?) |
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| halojoy |
| quote: | Originally posted by Ilianh
I wonder about using it with single supply...
and +\- 6v is that bad? I think thats enough for most of the signals we work with..
And opamps of this generation can saturate preety close to the supply rails...
still......
I'll order some samples for fun.
btw, any ideas whats the best opamp made by national, for audio |
It is impossible to say what OPamp is best for audio.
It ALL depends on what sort of audio spplication you deal with.
Some OPamps are good, or at least NOT bad,
in any application.
That makes them popular to have at home. Like 5534/5532.
One OP might be best as Phono-riaa amp
another for low-voltage battery appl.
A third is perfect as the heart/voltage-gain controller in a Power amp
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The area of OPamp use in Audio is a BIG field.
So best OPamp choice, will mostly be different depending on what you want to do.
But you will still go a long way with some popular op-amps.
OPA2134 is one. Not really bad on anything.
Generally useful, and with acceptable price.
/halo - still find very good use for NE5534/32 |
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| Ilianh |
I was reffering to national for their samples service, people like me dont have money to pay for stuff ;)
one day when iIget out of school... but for now.. I'm broke |
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| carlmart |
The chip certainly deserves a try.
It has impressive gain bandwidth (1.5GHz), slew rate (350v/us) and settling time 15ns.
Voltage swing is +/-4.9v (using a +/-6v supply) and PSRR is about 90dB.
The latter means that it might need a good supply, but looks very promising.
Trying it as a RIAA stage might be interesting, coupled to something like a BUF634/LT1010, like on the LT1115 RIAA application.
They suggest audio applications on the data page, which is already good.
Pity it's a SOIC type only, which limits DIY applications somehow.
Carlos |
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| dkemppai |
I've had them around for a few weeks now... ...even have a so-8 soldered into a dip converter. I have yet to try it. Specs look good, and it should be fast, but am finding that the limiting factor is the +- rail voltage being so low. Very annoying!
-Dan |
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| halojoy |
quote:
Originally posted by Ilianh
I found this new opamp from national, specs look very promising, anyone ever used it for hifi applications?
http://www.national.com/ds/LM/LMH6624.pdf
------------------------------------------------------------------
What is the price?
I guess it costs more than NE5534
It does not come in normal DIL, but in SO8 package.
It is for small signals and has slewrate 300MHz.
Supply voltage is only +- 6V
Extreme dc-offset precision performance.
It is not mainly intended for Audio-band.
But might be useable in some mic/riaa amplifier
as it has very low noise, only 0.9nV/-Hz. Like AD797.
I will read some more from the PDF.
/halo
------------------------------------------------------------------
As there are two threads about the same OP,
I now move my answer here, as this one is a bit more active.
This was the other - it seems dead already:
http://www.diyaudio.com/forums/show...&threadid=11129
/halo - ;) the OP-Amplifier Expert of diyaudio.com ;) |
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| planet10 |
| quote: | Originally posted by halojoy
As there are two threads about the same OP,
I now move my answer here, as this one is a bit more active.
This was the other - it seems dead already:
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Thanx halo... they are now the same thread
dave |
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| BrianL |
Please read the LMH6624 data sheet and look at the
graphs. It's a big mistake to judge an IC by the bulleted
list at the top of page one.
This low noise figure of 0.92 nV/rt(Hz) is measured at 1MHz.
The graphs show the 1/f corner for the noise to be somewhere
between 10kHz and 100kHz, depending on whether you
are looking at voltage or current noise. So noise in the
audio band is SIGNIFICANTLY higher than the 0.92 nV/rt(Hz)
number.
Note also that noise is particularly difficult to characterize
and most people don't do a very good job. So don't really
expect it to be as advertised.
I would be cautious about trying to use an amp with
1.5GHz GBW for audio applications. This is NOT for the
uninitiated or those with weak constitutions. |
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| fmak |
I would be cautious about trying to use an amp with
1.5GHz GBW for audio applications. This is NOT for the
uninitiated or those with weak constitutions. [/B][/QUOTE]----------------------------------------------
I agree although one ahould limit the bandwidth somewhat. I got my samples ulttra quick with a little circuit board!! |
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| BrianL |
Yes, given a manufacturer's demo board you should
be able to build a working circuit. But what about
the person who tries to create their own PCB?
What about the person who decides to use
some big audiophile film caps for bypassing?
etc. etc.
I think that for most audio applications one
would be better off with more "normal" parts. |
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