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Old 5th March 2005, 01:26 PM   #1
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Default noise problem with TDA1541

I made a no-oversampling DAC using a CS8412 and a TDA1541 (not TDA1541A) chip. The connection between CS8412 and TDA1541 is similar to:
http://users.verat.net/~rogic/1541/1...ev1_1b_sch.pdf
I used a NE5532 I/V.
I works fine for a 0dB 1KHz test tone. Could you confirm that the output signal has a 3.7V offset?
For low amplitude signal test I get a very distorded sound, even a -90dB 1KHz test tone make a huge distortion-noise and when I press pause on the CD player the noise totally disappears.

Any idea?

I have succeded to make a NOS dac using AD1862 and an OS dac using AD1955 and CS8412 and I had no problem. I will also test pcm56, ad1865 and pcm 1852.
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Old 5th March 2005, 06:09 PM   #2
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I found th problem. When I solder a 470p capacitor between pin 16 and 17 the problem disappears so my chips are TDA1541A although I read TDA1541 R1 on top of them.
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Old 7th March 2005, 11:26 AM   #3
JohnW is offline JohnW  Hong Kong
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Vincent,

Now it appears you have it working, what does it sound like?

John
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Old 8th March 2005, 12:30 PM   #4
Fin is offline Fin
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Quote:
Originally posted by vincent_brient
I found th problem. When I solder a 470p capacitor between pin 16 and 17 the problem disappears so my chips are TDA1541A although I read TDA1541 R1 on top of them.

They might still be the "Non A" version. I have read that Philips may not have included the internal capacitor between pins 16 and 17 - even though it shows it on the datasheet.

How have you dealt with pins 2 and 4?
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Old 9th March 2005, 09:31 PM   #5
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Quote:
Originally posted by JohnW
Vincent,

Now it appears you have it working, what does it sound like?

John
I listend the TDA1541 in a non-oversampling configuration, the CD drive was a CD723.
The sound is quite good but not has good as CD723 analog output. CD723 cd player uses a TDA1445 with a 4x IIR (not FIR according to datasheet) and a TDA1445.
Then I modified the CD723 to use the TDA1545A in a non oversampling configutation (using a CS8412) and again the sound was not as good.
I will investigate a will reclock the CS8412 using the CD player clock and if it is still not as good as the original CD723 than I will conclude that the 4x oversampling done in the CD723 is really better than the non-oversampling configuration.
I nice idea would be to connect a TDA1541 and other good DAC after the 4x oversampling.
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Old 9th March 2005, 09:32 PM   #6
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Quote:
Originally posted by Fin



They might still be the "Non A" version. I have read that Philips may not have included the internal capacitor between pins 16 and 17 - even though it shows it on the datasheet.

How have you dealt with pins 2 and 4?
Yes pin 2 and 4 are connected.
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Old 10th March 2005, 01:14 AM   #7
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If they are "Non A" - you can separate them.
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Old 10th March 2005, 10:14 PM   #8
guido is offline guido  Netherlands
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Think it's the other way around
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Old 11th March 2005, 04:19 AM   #9
Fin is offline Fin
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Hi Guido

I'm referring to the idea of using pin 2 for BCK - and pin 4 for an input directly from the masterclock.
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Old 11th March 2005, 07:23 PM   #10
guido is offline guido  Netherlands
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Yes, i'm mixed up. My bad.
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