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Old 22nd November 2004, 09:40 AM   #1
PatPet is offline PatPet  Hong Kong
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Default pcm1702, K grade or not?

Hello,

I'm interested in this DAC. But when I look at the price, I start to consider if it is worthwhile to go for the K-grade chips which costs nearly 60% more. Well, it seems 29USD for each 1702-K is too much. But I start to think about balanced/parallel solution but how will 1702-J compare with 1702-K in these situations?

Guys, I'm stuck between the two options, either balanced/parallel 1702-J or balanced/parallel 1702-K. Which one shall I choose?

Thanks

Pat
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Old 22nd November 2004, 10:30 AM   #2
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I have measured lots of PCM56, PCM58, TDA1541 and I do not give a penny for those stamps anymore.
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Old 23rd November 2004, 08:07 AM   #3
PatPet is offline PatPet  Hong Kong
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Thank you Benhard,

And which would you prefer, if you have to choose between pcm1702 and pcm56?

I'm deciding which is better for balanced/paralleled application.
The pcm56 is very cheap, around 10USD each, but doesn't rate as good as pcm1702 in dynamic range. But in the datasheet, pcm56 is described as the state of the art chip.
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Old 23rd November 2004, 08:31 AM   #4
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Post Pcm56

Quote:
Originally posted by PatPet
Thank you Benhard,

And which would you prefer, if you have to choose between pcm1702 and pcm56?

I'm deciding which is better for balanced/paralleled application.
The pcm56 is very cheap, around 10USD each, but doesn't rate as good as pcm1702 in dynamic range. But in the datasheet, pcm56 is described as the state of the art chip.
Hi patpet, The PCM56 is an antiquated chip. I found the AD1851 better and the AD1865J-K much better. Just my personal experience of course.
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Old 23rd November 2004, 12:00 PM   #5
PatPet is offline PatPet  Hong Kong
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Hello Kwak

Could you describe the difference in sound with the three chips that you've mentioned? I'm eager to know how the analog chips sound.

Thanks
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Old 23rd November 2004, 12:26 PM   #6
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Pat,

I have 4 pieces of the 1702 but did not try them yet, performance differs a lot from chip to chip, that is why they are selected.
But manufacturers do not look at the spectrum, only measure total thd
Also performance may change after burn in.
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Old 23rd November 2004, 01:57 PM   #7
PatPet is offline PatPet  Hong Kong
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Thank you Benhard

I've got the idea that it's unnecessary to buy the "select" graded chips.
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Old 23rd November 2004, 05:06 PM   #8
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Quote:
Originally posted by PatPet
Thank you Benhard

I've got the idea that it's unnecessary to buy the "select" graded chips.
Best try for yourself...
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Old 23rd November 2004, 05:36 PM   #9
jwb is offline jwb  United States
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I used to balk at the cost of the 1704U-K (US$36 each), but after the design was done the difference between the K and the J (US$12 each) seemed insignificant. A DAC that can take advantage of the performance of the 1704 will undoubtedly run into the many hundreds of dollars anyway, so why not spend the extra $48?

On the other hand with the 1702 I can understand that you might not be spending as much money on a 44.1kHz/16-bit design as you would be forced to spend on a 96kHz/24-bit implementation.
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Old 27th November 2004, 01:35 PM   #10
PatPet is offline PatPet  Hong Kong
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Thank you everyone for your suggestions. I've decided to go for ad1865-k. Shall I start a new thread to discuss about the project or shall I just continue right here?
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