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TLE2426 and Noise Reduction

post #1 of 4
4/17/05 at 2:49pm
Thread Starter 
I have the 8 pin version of this chip for a buffer I am building, so I thought I should use the noise reduction feature. I am a bit confused as to how to hook it up, however. Unfortunatly, I don't have a scope to test the various possibilities.

First, according to tangent, one should use a 1uF cap. Others seem to be using a cap of a different size. Is 1uF necessary, or will other values be acceptable. (I seem to have a drawer full of about 16 different types of 0.1uF caps, but no 1uF, so this is really just a question of lacking the parts.)

Second, Tangent's picture of the circuit shows the noise reduction pin connected to V-. However, he states elsewhere that the noise reduction pin should be connected to the virtual ground pin. Is this correct? I am inclined to believe his web page over an offhand comment on a message board, except that the offhand comment seems to make sense.

Thanks for helping,

-d
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post #2 of 4
4/17/05 at 3:53pm
Quote:
Originally Posted by dsavitsk
I have the 8 pin version of this chip for a buffer I am building, so I thought I should use the noise reduction feature. I am a bit confused as to how to hook it up, however. Unfortunatly, I don't have a scope to test the various possibilities.

First, according to tangent, one should use a 1uF cap. Others seem to be using a cap of a different size. Is 1uF necessary, or will other values be acceptable. (I seem to have a drawer full of about 16 different types of 0.1uF caps, but no 1uF, so this is really just a question of lacking the parts.)

Second, Tangent's picture of the circuit shows the noise reduction pin connected to V-. However, he states elsewhere that the noise reduction pin should be connected to the virtual ground pin. Is this correct? I am inclined to believe his web page over an offhand comment on a message board, except that the offhand comment seems to make sense.

Thanks for helping,

-d

Here is a post that says connecting it to V- worked.
http://www6.head-fi.org/forum/showpo...2&postcount=25
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post #3 of 4
4/17/05 at 4:03pm
Read tangent's post again. He didn't say to connect it to virtual ground. He says to connect to "power supply ground", and then says that this means the COM pin on the TLE2426, which is V-.

As for the capacitor, you could use a 0.1uF but it probably won't be as effective as 1uF. The TLE2426 datasheet has 1uF as example in a number of places, so I think it could be construed as a recommended value.

If the output of TLE2426 is going to be swamped by large (> 100uF) rail caps then the NR pin capacitor probably won't improve things much anyway.
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post #4 of 4
4/18/05 at 3:33am
Quote:
Originally Posted by dsavitsk
he states elsewhere that the noise reduction pin should be connected to the virtual ground pin
When a 2-year-old post on the forums conflicts with current information on my web site, the web site is far more likely to be correct. I do not go back and edit old forum posts.
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