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Smiffy 26th April 2003 11:48 AM

op amp/dac data sheet help
 
Hi All
looked all over.Can anyone point me to datasheets for the following
Burr Brown PCM1700U dac chips(18 bit i think)
NEC C4570C op amps
All in a Pioneer SP-99D dolby AC3 decoder.
Any help greatly appreciated.
Smiffy

Netlist 26th April 2003 02:11 PM

Hi, Smiffy

The PCM1700U idatasheet is here:
http://manuales.elo.utfsm.cl/datashe...S/PCM1700.PDFs

The UPC4570C datasheet is here:
http://www.necel.com/nesdis/image/G10528EJ6V0DS00.pdf

/Hugo

Smiffy 26th April 2003 02:18 PM

Hi Hugo
Many thanks.Much obliged
Smiffy

jean-paul 26th April 2003 03:34 PM

Replacing the C4570 will be worth the trouble. They sound awful compared to even NE5532. Last time I saw them in a DCD2700 I replaced them for OPA2604 which was a big improvement.

Smiffy 26th April 2003 04:00 PM

Hi Jean Paul
Exactly what I was thinking
OPA2604s or similiar(AD8620?).But always have liked the OPA2604.nice sounding little op amp for very little money.Got about 10 lying around.Looking for a workshop manual but as Im in the UK and the SP99D was only released in the US im finding it difficult.First priority is getting rid of the fan that cools the vreg heatsink.driving me nuts.need to find out which ones are the hot ones.Thanks for advice.Smiffy

XTAL 18th March 2004 01:25 PM

Hi Jean Paul
OP2604 is pin to pin compitable with NEC C4570C?

Thanks

XTAL 18th March 2004 01:47 PM

And can I use 2 piece OPA627 to instead a NEC C4570C?

jean-paul 18th March 2004 07:41 PM

Quote:

Originally posted by XTAL
Hi Jean Paul
OP2604 is pin to pin compitable with NEC C4570C?

Thanks


Yes.

jean-paul 18th March 2004 07:44 PM

Quote:

Originally posted by XTAL
And can I use 2 piece OPA627 to instead a NEC C4570C?

Yes, but it'll be an expensive solution and you can have problems finding/designing adapters. Besides that other things can come up because of longer wires, proper decoupling etc. I would go for a good dual opamp.

XTAL 18th March 2004 10:58 PM

Thanks a lot.
As your experience. OPA2134 & OPA2604 which one is better to instead?


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