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Old 3rd February 2004, 06:25 PM   #1
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Default decoupling PCM1716

Decoupling digital supply
Oscons or Black Gates?
decoupling analogue supply for internal op amps
Black gates?
Any thoughts/preferences
Ta for any inf
Smiffy
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Old 4th February 2004, 12:21 PM   #2
hjelm is offline hjelm  Sweden
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Sorry if i intrude in the thread but any recommendations for the LPF filter caps on pins 11 and 18 on the pcm 1716. It is apparently equally important as the decoupling caps.
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Old 4th February 2004, 01:58 PM   #3
ljordan is offline ljordan  United States
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What exactly are these pins 11 and 18? Labeled common of analog output amp(L and R).


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Old 4th February 2004, 04:37 PM   #4
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Can't find any reference to pins 11 and 18 in the datasheet.Will ask BB what they do.

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

found the above op amp from AD,Looks promising but non conventional pin outs

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Old 4th February 2004, 07:02 PM   #5
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No intrusion at all Hjelm.Glad you brought it up.Was going to leave those caps alone.Maybe not now you mentioned it.Have e mailed BB/Ti
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Old 5th February 2004, 06:45 PM   #6
hjelm is offline hjelm  Sweden
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Maybe i was wrong in its function but it is apparently important see Kuei's statement a bit down.Use OS-CON in Vcc? .
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Old 6th February 2004, 01:24 PM   #7
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Thanks for the link.will give it a good read
This was the reply I got from Ti/BB today

EXRL,EXTR, these two pins are noise de-coupling function of
internal analog 0.5Vcc bias.
This 0.5Vcc bias is common level of internal analog section as
channel individual.
Noise de-coupling capacitor ( 1uF to 10uF ) should be connected
as typical application.

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