Need help about AD1853 DAC.

shyliang · 30th June 2007, 02:32 PM

I want to build a DAC with CS8414 and AD1853,
but i don't know how many PF C52* and C53*
(remarked in the picture below) should be .
Can some one tell me?
I want to use OPA2604 instead of OP275.
Thanks!!!!

banana · 30th June 2007, 02:46 PM

this is common abbreviation for lazy engineers.
NU = Not Used
NC = Not Connected
NP = Not Populated

They all means the same, and in this case, the cap should be 0pF.

zigzagflux · 30th June 2007, 02:57 PM

Could also mean non-polarized, but it doesn't seem to be so in this schematic. They are using symbols to indicate polarity.

shyliang · 30th June 2007, 03:06 PM

Thanks.
Why C57 NP0 is 220PF?
What dose NP0 mean?

ALP · 30th June 2007, 04:18 PM

Some operational amplifiers don`t like ultrasound signals on input. This capacitors is simply filter for it. Value may be 100-4700 pF range. Use high speed opamp, then this capacitors not needed. Looks like AD812.

ALP

shyliang · 30th June 2007, 04:28 PM

OH,I see.
THANK YOU SO MUCH!

Marek · 13th July 2007, 08:24 AM

I've made DAC on AD1853 (PCM2702-DIR1703-AD1896-AD1853) with the same output stage suggested by Analog. I used OPA627 for I/V and AD797 for filter with great results.

morpheus82 · 13th July 2007, 09:46 AM

marek, could you post the schematic,please?

30th June 2007, 03:06 PM	#4
shyliang diyAudio Member Join Date: Mar 2007	Thanks. Why C57 NP0 is 220PF? What dose NP0 mean? __________________ shyliang

30th June 2007, 04:28 PM	#6
shyliang diyAudio Member Join Date: Mar 2007	OH,I see. THANK YOU SO MUCH! __________________ shyliang

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30th June 2007, 02:46 PM	#2
banana diyAudio Member Join Date: Feb 2003 Location: Hong Kong	this is common abbreviation for lazy engineers. NU = Not Used NC = Not Connected NP = Not Populated They all means the same, and in this case, the cap should be 0pF.

30th June 2007, 02:57 PM	#3
zigzagflux diyAudio Member Join Date: Oct 2006	Could also mean non-polarized, but it doesn't seem to be so in this schematic. They are using symbols to indicate polarity.

30th June 2007, 04:18 PM	#5
ALP diyAudio Member Join Date: Jun 2004 Location: RU	Some operational amplifiers don`t like ultrasound signals on input. This capacitors is simply filter for it. Value may be 100-4700 pF range. Use high speed opamp, then this capacitors not needed. Looks like AD812. ALP

13th July 2007, 08:24 AM	#7
Marek diyAudio Member Join Date: Apr 2003 Location: Katowice	I've made DAC on AD1853 (PCM2702-DIR1703-AD1896-AD1853) with the same output stage suggested by Analog. I used OPA627 for I/V and AD797 for filter with great results.

13th July 2007, 09:46 AM	#8
morpheus82 diyAudio Member Join Date: Oct 2004	marek, could you post the schematic,please?

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