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Old 27th February 2003, 12:05 PM   #1
Electrons are yellow and more is better!
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Default AD8610 in a straight forward application

Some people here elevates AD8610 to the skies, I even get emails about it. Now I have ordered two samples to test in my OPA134/BUF634, OPA627/BUF634 headphone amp with all SMD parts.

Has anyone used this opamp in a real pcb with professional connection if you know what I mean? I don't mean the chip pactched in a CD or preamp.

I can see only one minor disadvantage, max 26,7 V max instead of 36 V at least which is the common max voltage.

http://www.analog.com/Analog_Root/pr...8610%2C00.html
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Old 27th February 2003, 12:26 PM   #2
sonnya is offline sonnya  Denmark
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do you mean like a PCB made for this opamp as a preamp?

if yes i have done one....
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Old 27th February 2003, 12:55 PM   #3
Electrons are yellow and more is better!
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And your experience were....? Did it behave? Did you have groundplane? SMD parts?
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Old 27th February 2003, 01:09 PM   #4
ALW is offline ALW  United Kingdom
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Default Peranders

I've used it in a Jung-type reg, fittted surface mount to my professionally produced PCB's, and 'bodged' to my headphone amp.

All other components were leaded, it's a very stable device and well-behaved.

Andy.
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Old 27th February 2003, 01:20 PM   #5
sonnya is offline sonnya  Denmark
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it is made as a singleside PCB with ground plane. Decoupling is done with FKP2, 10nF and oscon 47uF.

feedback resistors are 10k .1% vishay smd....

powersupply are LM431 based regulators.

It behaves well, only in turn of it buzes... but this could very well be the LM431 oscillating.. i have not checked it... i have measured the powerlines to the opamps with signal and i have checked the output for overshoot.. Very clean on the supply lines. Also the signal on the outputs is very clean....

i have add a series resistor on the outputs of 100R also Vishay .1%

The sound is smoth detailed... You do not have any harsh sound after i have biased the output into class A.
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Old 27th February 2003, 08:34 PM   #6
Electrons are yellow and more is better!
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I don't doubt that AD8610 is so good people says but it never hurts to get user opinions.

I have tested LT1115 and LT1028 and notice that they don't like too much impedance to the inputs. 47 kohm is too much. The value creates a substantial DC shift at frequencies over 200 kHz. The datasheets tell you nothing of suitable resistor of the upper limit....

This DC shift means probely nothing in the audio band but I don't like bad looking curves. An amp should have clean step response, nice looking clipping characteristics and nice HF performance. This is good also for the audio performance, no proof of that but it feels better....
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Old 28th February 2003, 06:53 AM   #7
Electrons are yellow and more is better!
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Very quite here. I thought I would get lot's of opinions. Maybe the opamp is very exotic at the moment. The chip is rather new so I gather that not so many have used it yet. It sure looks promising, especially when it's possible to get those for free... with express delivery!
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Old 28th February 2003, 07:04 AM   #8
sonnya is offline sonnya  Denmark
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not all that quite i write back later today....

My concern is also on the input impedance on highspeed circuit.. Too high and it will suffer in performance... oscillate
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