Mash DAC chip MN6476 datasheet?

[Bill Fuss]

Anyone have the datasheets on these late generation Mash chips?

Ive searched high and low, someone must have them somewhere.

Thanks in advance, Bill

 

[tiefbassuebertr]

I would ask by NAD's development aera, because a wide range of their cd player uses Matsushita's mash DAC's

 

[aparatusonitus]

You can download Technics SL-PS900 service manual here TECHNICS SLPS900 Service Manual free download, schematics, eeprom, repair info for electronics it has an MN6476 inside, so you could see pinout, implementation, etc.

 

[Bill Fuss]

Many,many thanks. I am in your debt. That is the exact model I'm working on.

Best, Bill

 

[Marmotus]

Search at Lampizator Site, there's one treated with a triode analog output...

OOPs it was a SL-PS 700, but worth to give a look: http://www.lampizator.eu/LAMPIZATOR/REFERENCES/TECHNICS/SL-PS700/Technics SL-PS700.html

 

[Bill Fuss]

Thanks for that too. The 6476 is a strange chip, it has two differential outputs for each channel, and the ps900 uses all 8 output pins. Very wierd.

 

[aparatusonitus]

It has 8 MASH convertors inside, that's why. BTW, is it something wrong with it (player), or you just want to tweak it?

 

[Bill Fuss]

Ah, that's right. I was looking to try transformer output directly off the chip but it looks like it will still take some steep filters to do it. Any ideas on this? I better keep looking for the datasheet.

 

[aparatusonitus]

I really don't know the best way to deal with PWM outputs, except that I would use best caps (mica or styroflex/polystyrene) for passive/active LP filtters. Besides that, you really want to change those nasty 3-pin regulators IC11/12 for (super) shunt regulator like TL431 for analog and digital supply, eventually buffered with npn transistor and high quality, low ESR Al cap close to all supply/ground pins. Than you can play with opamps ;-)