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Old 8th March 2003, 11:01 AM   #1
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Default Datasheet for Samsung KDA0316LN or Sanyo LC7881 DAC?

These two are equivalent I am told. If they are not, then I need the data on the Samsung one. I can't find any worthwhile reference to it anywhere on the web.
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Old 8th March 2003, 12:02 PM   #2
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Hi, Circlotron

On the data I have (which is not a lot) they are the same IC's.
I give you the pin-out, tell me if you want the picture of the block-diagram.
I will scan it for you then.
1: Ch 1 out
2: VrefH
3: VrefH2
4: VDD2
5: WCLK2
6: LRCK
7: WCLK1
8: DATA
9: BCLK
10: VDD1
11: TST OUT
12: TST1
13: TST2
14: IF
15: GND
16: VrefL
17: GND
18: VrefL2
19: NC
20: Ch 2 out

/Hugo - Has a crappie scanner but will try on request
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Old 8th March 2003, 12:03 PM   #3
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If you would have used the search function as offered on this site you would have found this:

Sony CDP270 or LC7881 DAC schematic
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Old 8th March 2003, 12:12 PM   #4
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Quote:
Originally posted by jean-paul
If you would have used the search function as offered on this site you would have found this:


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Old 8th March 2003, 12:18 PM   #5
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Quote:
Originally posted by jean-paul
If you would have used the search function as offered on this site you would have found this:

Sony CDP270 or LC7881 DAC schematic
Ahh.. whoops!

Only need to know whether data is LSB or MSB in first. thanks.

/Circlotron - caught out being to lazy to search by an expert.
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Old 8th March 2003, 02:01 PM   #6
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Default It's All Chinese, Errrr, Japanese To Me....

Hi Graham,
If you Google Search - "sanyo data sheets", the fifth result says Notification.
Click ok on the bottom and go to the next page, enter 'Type Num' LC7881 and you'll get a list table of 49 results.
Listed is 7881.PDF and others.

Cheers, Eric.
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Old 8th March 2003, 02:27 PM   #7
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An excellent tip you gave concerning Sanyo chips, Eric !
Maybe I can find the datasheet of the 24 pin DIL DAC chip and the DIR used in my Musical Fidelity Tubalog. On the english webpages all datasheets of older chips have been removed. The datasheets offered on the page you mention mostly are japanese datasheets, but still they are better than nothing at all.

Regards,

Jean-Paul\ - who is too lazy to search sometimes too.

edit: I actually found english datasheets for most chips as well.
And finally I found datasheets of the chips used in my DAC
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Old 8th March 2003, 02:36 PM   #8
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Default No Worries, Mate !.

Glad to be of help.

Eric.
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Old 28th April 2003, 03:47 AM   #9
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Default MF Tubalog

Hi Jean-Paul,

I have this DAC as well and wish to make some mod to it, thu' have yet to open the cover.

You mentioned that it used a 24 pin Sanyo DAC Have you finally recognised which model it is using?

This is what Sanyo have:
LC7881 16 bit DA 20 DIP
LC7883K 16 bit DA with digital filter 28DIP
LC78833V 16 bit DA with 4fs digital filter and buffer amplifier 24 SSOP
LC78835K 18 bit DA with 8fs digital filter and buffer amplifier 24 DIP
LC78836M 16 bit DA with 8fs Digital filter and buffer amplifier 24 SOP
LC78857V 1 bit DA with 8fs digital filter and analog filter 24pin SSOP
LC78858V 1 bit DA with 8fs digital filter and analog filter Support 256fs and 384fs 24 pin SSOP

Could it be one of them?

There are 2 Sanyo DIR reflected on their website

LC8901 and 8903. I kind of suspect it should be 8901

BTW do u hav the schematic?
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Old 28th April 2003, 12:32 PM   #10
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Hi tbklbl ( ? ),

It's LC78835K and LC8901. Please pay attention to the power supply. The filament current for the tubes is running through the positive 12 V regulator and this one gets too hot because of insufficient heatsinking. There is space for an extra 12 V regulator between the +/- 24 V caps for the tubes and the original 12 V regulator ( on the groundplane ). Scratched some tracks, drilled a 3 mm hole for the wires and hardwired the new regulator with decoupling caps on the pins. I used a real big heatsink on the new 7812 because it gets hot. ( about 800 mA current ). If you do it carefully you can use the original 7812/7912 only for the opamps and the new 7812 for digital and filaments. That way you can be sure the analog PS is clean. If you want it that way you have to connect the 7805's input ( digital supply ) to the new 7812's output !

Changed all caps around the DAC for BG NX Hi Q 22 uF 6,3 V. All other caps are changed to Panasonic FC.

Very good sounding DAC now. Opamps are OPA627BP which was a very big improvement. Removed the socket of the DAC chip and soldered it straight on the PCB. Did some extra decoupling on the +/- 12 V for the opamps. That's about it ! Didn't change the input transfomer yet, it is of a too low bandwidth ( 1 MHz ). Maybe because it is a transformer for Triacs...

I asked the Dutch importer for a schematic and he was embarassed to tell me that MF England didn't have a schematic.
Mine is a revision 1, is yours a rev. 2 ? Curious about what's changed in the device.

Be careful with the screws of the upper cover. They are screwed in brass sockets which are pressed in the wooden panels. When too much force was applied the sockets can become loose of the wood. I glued all brass sockets again with 2 component glue and repaired the cracks in the wooden panels with high quality wood glue.
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