New opamp from National

[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

[janneman]

Good tip Mark, thanks.

Jan Didden

[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.

[fmak]

[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?

[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

[halojoy]

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

[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?)

[halojoy]

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

[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

[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