New ultralow noise, high BW op-amp from ADI - diyAudio
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Old 17th December 2003, 12:13 AM   #1
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Default new ultralow noise, high bw opamp from ADI

this looks pretty promising, although you are going to be soldering it with a magnifying glass, the AD8099 from Analog:
http://www.analog.com/UploadedFiles/...81AD8099_0.pdf
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Old 17th December 2003, 07:41 AM   #2
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Low noise but not in the audio band, I'm afraid.
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Old 12th February 2004, 09:04 AM   #3
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Default AD8099 not in audio band???

What do you mean by: "AD8099 not in audio band" ?

At the spec-page:

http://www.analog.com/Analog_Root/pr...8099%2C00.html

I read the following:

"Applications:

* Pre-amplifiers
* Receivers
* Instrumentation
* Filters
* IF and Baseband Amplifiers
* A-to-D Drivers
* DAC Buffers
* Optical electronics"

For me AD8099 seems to beat all other opamps by several length - Extremely low noise and extremely high slew-rate.

Has anyone tried it?

And what about the AD8067?
http://www.analog.com/Analog_Root/pr...8067%2C00.html


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Old 12th February 2004, 09:36 AM   #4
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Nice chip. The advantage of these high speed amps is that the performances below 100kHz or so are very, very good for audio. Low noise, low THD up to well above the audio band, although I noticed a difference in THD performance between the two versions (SOIC and CSD).
They also can drive large loads, they can directly drive a headphone.
Disadvantage is the low supply voltage of 15V absolute max, which in practise means +/-6V, giving max output of 3.5VRMS or so. And, because of the high speed, they may be hell to stabilise - the PCB design will be quite critical I think.


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Old 12th February 2004, 11:04 AM   #5
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Default Re: AD8099 not in audio band???

Quote:
Originally posted by askbojesen
What do you mean by: "AD8099 not in audio band" ?

At the spec-page:

http://www.analog.com/Analog_Root/pr...8099%2C00.html

I read the following:

"Applications:

* Pre-amplifiers
* Receivers
* Instrumentation
* Filters
* IF and Baseband Amplifiers
* A-to-D Drivers
* DAC Buffers
* Optical electronics"

For me AD8099 seems to beat all other opamps by several length - Extremely low noise and extremely high slew-rate.

Has anyone tried it?

And what about the AD8067?
http://www.analog.com/Analog_Root/pr...8067%2C00.html


- Ask
Preamplifier or DAC buffer does not automaticly means audio preamp or audio DAC buffer..

The noise level from the AD8099 is very high in the audio band.
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Old 12th February 2004, 11:19 AM   #6
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Default Re: AD8099 not in audio band???

Quote:
Originally posted by askbojesen
What do you mean by: "AD8099 not in audio band" ?

At the spec-page:

http://www.analog.com/Analog_Root/pr...8099%2C00.html

I read the following:

"Applications:

* Pre-amplifiers
* Receivers
* Instrumentation
* Filters
* IF and Baseband Amplifiers
* A-to-D Drivers
* DAC Buffers
* Optical electronics"

For me AD8099 seems to beat all other opamps by several length - Extremely low noise and extremely high slew-rate.

Has anyone tried it?

And what about the AD8067?
http://www.analog.com/Analog_Root/pr...8067%2C00.html


- Ask
I mean that you must read and understand all important parameters and make an opinion from that. 0.95 nV/Hz says nothing if the application is high level and the signal source is "normal". You must see how the noise looks like in different bands.

So the opamp won't be particulary noisy for a 1 V application but is it good for a mic or MC preamp? .... but in other aspects the performance is impressing.
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Old 11th March 2007, 04:57 PM   #7
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I was going to try out the AD8067.

The nV root Hz curve seems to be pretty similar to the AD843 I was originally using, if not slightly better. The 8099 curve seems to be ten times better than the 843s.

The AD8067 has a lower slew rate than the 8099, but it's still two or three times quicker than the AD843 and the bandwidth is also lower than the 8099, but still better than the AD843, so stability should be less of a problem compared to the 99. It also has a wider power supply range than the 99.

Maybe I'm missing some detail or you're just used to quieter opamps.

Any recommendations for replacing the AD843?
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Old 11th March 2007, 07:00 PM   #8
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I just saw a thread mentioning the AD797 for low noise.

This wasn't included in my ADI searches because it's slew rate is more than ten times worse than the AD843 and I disliked the AD8610, which is three times quicker than the AD797. I also preferred the AD843 over the OPA637, which has only half the slew rate of the 843. So it seems slew rate is winning out over noise for me at the moment. Although I'm using this as a simple headphone amp, not a preamp in a RIAA stage.
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Old 11th March 2007, 09:04 PM   #9
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Quote:
Originally posted by eeka chu
I just saw a thread mentioning the AD797 for low noise.

This wasn't included in my ADI searches because it's slew rate is more than ten times worse than the AD843 and I disliked the AD8610, which is three times quicker than the AD797. I also preferred the AD843 over the OPA637, which has only half the slew rate of the 843. So it seems slew rate is winning out over noise for me at the moment. Although I'm using this as a simple headphone amp, not a preamp in a RIAA stage.

Hi,

Have you looked at the slew rate that you are likely to see at the signal input, worst case, and compared that to the opamp slew rate (AD843, 797, etc)? You probably will see several orders of magnitude overkill. Why are you so worried about this particular issue?

Jan Didden
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Old 11th March 2007, 11:13 PM   #10
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Quote:
Originally posted by janneman
And, because of the high speed, they may be hell to stabilise - the PCB design will be quite critical I think.
Jan Didden
You ain't kiddin' -- I am trying to implement a 100kHz low pass filter to replace a switched-cap filter -- there is some "clock-through" with the latter and I thought it would not be that difficult with one of these new high speed chips -- it's nice to have high GBW Product until you have to stabilize it -- the filter easily becomes an oscillator.
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