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Old 31st January 2012, 02:44 AM   #1
acl0056 is offline acl0056  United States
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Default mic pre application buffer op-amp question

I have been playing around with a mic preamp design that uses a dual pot for a balanced trim control, followed by LME49720 buffers on the output. I was looking around and discovered the LME49610 high current buffer.

Is there any reason that I would want to increase the output current?

Is there any reason that this would be too much current?

Would there be any other advantages to using the LME49610?

Thanks in advance,

Adam
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Old 17th February 2012, 10:19 PM   #2
sek is offline sek  Germany
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Hi,

the LME49610 is the newer brother of the renowned LME49600, best known for it's duty in a variety of headphone and line driver amplifiers.

You could take advantage of it's low output impedance and huge headroom in an application where you'd have to drive something like an extremely long cable run. Even the datasheet application (fig. 2 on page 9) works like a charm, just read up on everything regarding PCB layout, PSU decoupling and thermal considerations.

Other than that, if you don't need a high current output stage, why not save yourself the hassle of a power-inefficient and distorting class-AB stage.

Out of curiosity, what do you mean by symetrically trimming by use of a dual pot?

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Sebastian.
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Old 18th February 2012, 05:33 PM   #3
acl0056 is offline acl0056  United States
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Quote:
Originally Posted by sek View Post
...
Out of curiosity, what do you mean by symetrically trimming by use of a dual pot? ...
What I am doing is something like this, but with op-amp buffers:

Balanced B1 Buffer
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Old 19th February 2012, 08:05 PM   #4
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Hi
just to put it another way the LME49610 is capable of driving low impedance loads such as 32 ohms (headphones) to high volume levels .The current it outputs will be dependant on the load it has to drive.The 49720 is more like a normal IC used for line driving and will drive loads as low as 600 ohms .

Last edited by epicyclic; 19th February 2012 at 08:10 PM.
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