Actually, the Burr-Brown "Advanced 1-Bit BiCMOS Dual 18-Bit DIGITAL-TO-ANALOG CONVERTER" PCM67 is a hybrid (1-bit, multi-bit) design.
Datasheet here.
I once owned a Theta Chroma 396 (1996 model) d/a processor that used it ( downstream an PMD100 digital filter). Stock, the Theta sounds good, with a punchy, dynamic sound.
Interestingly, the datasheet for the PCM67 suggests:
Anyone experiment with this DAC using NOS?
Datasheet here.
I once owned a Theta Chroma 396 (1996 model) d/a processor that used it ( downstream an PMD100 digital filter). Stock, the Theta sounds good, with a punchy, dynamic sound.
Interestingly, the datasheet for the PCM67 suggests:
Anyone experiment with this DAC using NOS?
I have some PCM69s. Will drive them testwise with SM5842/DF1706 or AK4137 - so not NOS. Didn't finish the protoype yet...
But the PCM67/69 are extremely cheap and there is almost no risk of getting fakes 🙂
But the PCM67/69 are extremely cheap and there is almost no risk of getting fakes 🙂
The PCM69 is NOT intended for hi-fi application. They are for music instruments (as noted in the datasheet).
Btw: Theta first began using the PCM67 in their Cobalt DAC (1993), which is similar to the Chroma (1996)
Cobalt:
Well, then please enlight me. What do you think is the fundamental difference between 67 & 69 soundwise?
Other than the timing I didn't find anything in the datasheet and regarding the "offset", where the switchover to the multibit DAC occurs, I do not expect any major benefit for either.
For what it's worth, I've ordered some '67 as well to have a base for jugdements 😉
Other than the timing I didn't find anything in the datasheet and regarding the "offset", where the switchover to the multibit DAC occurs, I do not expect any major benefit for either.
For what it's worth, I've ordered some '67 as well to have a base for jugdements 😉
From my experience PMD100 is the part that makes a difference. But in stand alone mode minimum OS is 2X. I think that is not possible without programming to get NOS from PMD100. If I am remembering well? Please correct if it is wrong? Once I was made a dac with PMD100 and PCM56. I can described the sound like in post 1 + very natural...
What do You think about that single +5V supply? All other proven, more than good, PCM dac chips have +/- supply?
What do You think about that single +5V supply? All other proven, more than good, PCM dac chips have +/- supply?
PMD100 is unobtainium.
So, no sense in the regard of that topic at all, since PCM67/69 are €2 parts... They are - just cheap, none-mainstream and most probably not any good at all.
So its just for the pure joy of messing around with mid-oldschool pseudo-multibit thingies.
Kind of hollowman's avatar - doing such is not needed if you have 4" pipes... Europe FTW 😉
So, no sense in the regard of that topic at all, since PCM67/69 are €2 parts... They are - just cheap, none-mainstream and most probably not any good at all.
So its just for the pure joy of messing around with mid-oldschool pseudo-multibit thingies.
Kind of hollowman's avatar - doing such is not needed if you have 4" pipes... Europe FTW 😉
PMD100 is not ordinary os filter. It is hdcd encoder at first place. PMD100 for my opinion is better sounding against other OS filters.Even when no-hdcd is coded.
And also very useful for I2S to BB format adapter. OS function with PMD100 is also better than other same-puposes devices.
So, in case of PMD100 OS is not the main point.
I don't think that what they meant. Last page on datasheet shows suggested hi-fi dac schematic.
And again quite a few hifi manufacturer used pcm69 for their product as such Trichord Pulsar Dac.
I have Akai AM-69 amp from early 90's.It has internal dac uses pcm69 and sounds more than ok.
I have 20 of them. But then I was a licensee in 1996 and paid $5,000 for the privelege. Too bad they sold out to Microscum.
Last edited:
- Status
- Not open for further replies.