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Old 13th February 2003, 03:39 PM   #1
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Default New opamp from National

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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Old 13th February 2003, 03:59 PM   #2
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Good tip Mark, thanks.

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Old 13th February 2003, 05:29 PM   #3
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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.
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Old 13th February 2003, 05:41 PM   #4
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Default Re: New opamp from National

[QUOTE]Originally posted by MRehorst
[B]LMH6624 - Ultra-low Noise Wideband Op Amp
--------------------------------

Looks good; pity it's confined to +-6V. Does anyone know how it sounds?
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Old 14th February 2003, 01:58 AM   #5
Ilianh is offline Ilianh  Canada
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Default new opamp

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
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Old 14th February 2003, 02:42 AM   #6
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Default Re: new opamp

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
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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Old 14th February 2003, 03:33 AM   #7
Ilianh is offline Ilianh  Canada
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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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Old 14th February 2003, 03:44 AM   #8
halojoy is offline halojoy  Sweden
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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
----------------------
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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Old 14th February 2003, 04:17 AM   #9
Ilianh is offline Ilianh  Canada
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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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Old 14th February 2003, 12:39 PM   #10
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Default Specs

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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