Any Yamaha DAC fans around?

Status
Not open for further replies.
Jump to Latest
hollowman

hollowman

Member
Joined 2007
#1
An externally hosted image should be here but it was not working when we last tested it.


Have a 1989 Philips (Magnavox) AK698 budget CDP, 2x oversampling (!!!), made in Austria. Budget because of built-in RCA cables and 2-digit (track only) LED display. Nevertheless, the unit is impressively built otherwise (same robust/heavy build quality as other Philips CDPs from 80s)

Quite a few of the ICs are Japanese manuf. SMDs (Mitsubishi decoder/etc., Matsushita decoder DRAM) ... and the DAC (Yamaha YM3016).

Was getting it ready to possibly re-Bay it (bought on eBay years ago but never listened to it till now!) -- and was surprised by the BIG, dynamic sound. In many ways, some of the best Philips digital sound I've heard.

Could it be that Yamaha YM3016? Wiki actually has a dedicated entry on this DAC:
The YM3016, aka DAC-GS, is a floating point digital-to-analog converter chip developed by Yamaha. It generates stereo analog output (16-bit dynamic range) from either a two-channel serial or a 16-bit binary/two's complement input, the sound data containing a 10-bit mantissa and 7-bit exponent. It was featured alongside many Yamaha sound synthesis chips, including the YM2608 and YM2610.
Click to expand...

BTW ...
ESR tested the electros (all orig. and still GREAT!!). O'scope traces on PSU and audio signal look great, too. But, perhaps, not surprising: (a) this unit has VERY low hours (kept in safe+dry+cool+clean storage); and, (b) older budget-grade electros were usually better-sealed than the junky budget-grade modern electros.

An externally hosted image should be here but it was not working when we last tested it.

An externally hosted image should be here but it was not working when we last tested it.


Refs:
Yamaha YM3016 - Wikipedia, the free encyclopedia
http://wiki.neogeodev.org/index.php?title=YM3016
 
Last edited:
#2
More images...

An externally hosted image should be here but it was not working when we last tested it.


An externally hosted image should be here but it was not working when we last tested it.


An externally hosted image should be here but it was not working when we last tested it.


An externally hosted image should be here but it was not working when we last tested it.


An externally hosted image should be here but it was not working when we last tested it.


An externally hosted image should be here but it was not working when we last tested it.


An externally hosted image should be here but it was not working when we last tested it.
 
#4
Wrong, hollowman!

hollowman said:
How the YM-3016 does 2X oversampling...

An externally hosted image should be here but it was not working when we last tested it.

YM3016 - NeoGeo Development Wiki

MP (connected to 15)
BC (connected to 14)

And/or does the ANALOG SW (analog switch sample and hold) also play a role?????
Click to expand...
Apparently, the Mitsubishi M50422P decoder (DSP) -- per its datasheet notes -- can do 2x and 4x DF...
M50423FP ... - Datasheet Search Engine Download
It's shown in the 2nd image, in OP.
 
Status
Not open for further replies.
Top Bottom