MHDT Havana DAC
Jun 22, 2011 at 12:01 PM Post #1,246 of 2,680

niamex

100+ Head-Fier
Joined
Jun 3, 2010
Posts
102
Likes
12


Quote:
Maybe this is incorrect.....
 
TOTAL HARMONIC DISTORTION
VO = ±FS at f = 991Hz:
PCM56P-K –94 –92 dB
PCM56P-J –94 –88 dB
PCM56P, PCM56U –94 –82 dB
PCM56P-L –94 –80 dB

VO = –20dB at f = 991Hz:
PCM56P-K –75 –74 dB
PCM56P-J –75 –68 dB
PCM56P, PCM56U –75 –68 dB
PCM56P-L –75 –60 dB

VO = –60dB at f = 991Hz:
PCM56P-K –35 –34 dB
PCM56P-J –35 –28 dB
PCM56P, PCM56U –35 –28 dB, there is no chance
PCM56P-L –35 –20 dB


No,that's correct and explains everything !   Forget about the high values on the left side - there is no chance the quality control to miss a chip showing for example 92 db and mark it as J grade - no  - it is marked K and goes to the first qlty basket. Therefore if you have a J grade chip the best chance is to get 91 db and the worst 88 db - at the same time K grade is  min 92 db and in the best case 94 db which is really very good. I mean you can hear better the blackness or the silence in case you have better S/N -/signalt to noise/ ratio.
Cheers
 
 
Jun 22, 2011 at 12:08 PM Post #1,247 of 2,680

niamex

100+ Head-Fier
Joined
Jun 3, 2010
Posts
102
Likes
12
TOTAL HARMONIC DISTORTION
VO = ±FS at f = 991Hz:
PCM56P-K –94 –92 dB
PCM56P-J –94 –88 dB    /92-88/
PCM56P, PCM56U –94 –82 dB   /88-82/
PCM56P-L –94 –80 dB  /     82-80/

VO = –20dB at f = 991Hz:
PCM56P-K –75 –74 dB
PCM56P-J –75 –68 dB  /74-68/
PCM56P, PCM56U –75 –68 dB  /74-68/
PCM56P-L –75 –60 dB   /68-60.

VO = –60dB at f = 991Hz:
PCM56P-K –35 –34 dB
PCM56P-J –35 –28 dB  /34-28/
PCM56P, PCM56U –35 –28 dB  /34-28/
PCM56P-L –35 –20 dB  /28-20/
 
 
Look at the figures in the brackets - I thing they show more realistic maximum values you can expect.
Cheers
 
Jun 22, 2011 at 2:06 PM Post #1,250 of 2,680

s1rrah

Headphoneus Supremus
Joined
Sep 27, 2007
Posts
2,640
Likes
181


Quote:
Thanks guys, all clear, It's time to get K grade ones and test them now.



If you locate more than two ... let me know and I'll pick up a couple as well. 
 
Thanks in advance...
 
.j
 
Jun 23, 2011 at 8:14 AM Post #1,254 of 2,680

Dynobot

Headphoneus Supremus
Joined
Aug 23, 2008
Posts
1,657
Likes
18
I contacted Mouser to ask the about the KG4 and the K product.
 
 
chatinfo.gif
Please wait for a Web Chat Representative to respond.
chatinfo.gif
You are now chatting with 'Tamara'
Tamara: Good Morning Edward
Tamara: How may I assist you
Edward: Good morning
Edward: Can you tell me the difference between the PCM56P-KG4 and the PCM56P-K product?
Tamara: One moment please, let me get a tech to assist you
Edward: Ok
chatinfo.gif
Please wait while I transfer you to 'Tech Larry'.
chatinfo.gif
You are now chatting with 'Tech Larry'
Tech Larry: Hello, I am a technical support representative.  Please give me a moment while I review your request.
Edward: Ok
Tech Larry: The G4 indicates this product was given a "green" rating. There no notable difference in these two part numbers.
Edward: Ok, so both products are the "K" series?
Tech Larry: correct
Edward: Ok thank you very much.
 
Jun 23, 2011 at 10:28 AM Post #1,256 of 2,680

niamex

100+ Head-Fier
Joined
Jun 3, 2010
Posts
102
Likes
12
I think it matters very much. These are unknown products made somewhere sometime. They do not have even the sign of BB - forget it. Could be manufactured somewhere by order of TI but I do not believe it - I wander whether TI are producing something without a sign.
 
Jun 23, 2011 at 10:34 AM Post #1,257 of 2,680

Dynobot

Headphoneus Supremus
Joined
Aug 23, 2008
Posts
1,657
Likes
18
Do you think a product that performs to spec will sound differently if is were made in two different locations?
 
Products out of tolerance will get rejected in either case.
 
However if a stamping helps the perception of superiority then so be it....
 
 
 
Jun 23, 2011 at 10:49 AM Post #1,258 of 2,680

Dynobot

Headphoneus Supremus
Joined
Aug 23, 2008
Posts
1,657
Likes
18
Made by Texas Instruments in Malaysia....if it makes any difference.  I would guess that Texas Instruments has factories all over the world and they all operate to the same standards....I guess.
 
Chat with Mouser: 10:50AM EST
 
chatinfo.gif
You are now chatting with 'Emily'
Emily: Good morning Edward, how may I help you today?
Edward: Hello, I have a question about the PCM56P-K product
Edward: The photo does not show any identification on the chip, is this made by Texas Instruments or some other company? In the US or other?
Edward: Hello, good morning Emily
Emily: I am reviewing the product.  One moment.
Emily: This product is made by Texas Instruments, and its country of origin is Malaysia.
Edward: Ok Thank you
 
Jun 23, 2011 at 12:47 PM Post #1,259 of 2,680

robeeert1

100+ Head-Fier
Joined
Dec 29, 2008
Posts
396
Likes
14
What purpose did Texas Instruments build factories in several countries doing the same. (Korea, Japan, Malaysia)?. I suppose they don't have its own factory at all.
They simply order their DACs in various factories choosing the best offer. (the cheapest).
I think there is no quality standard. This is my opinion only. I may be wrong.
 
Jun 23, 2011 at 1:03 PM Post #1,260 of 2,680

niamex

100+ Head-Fier
Joined
Jun 3, 2010
Posts
102
Likes
12


Quote:
What purpose did Texas Instruments build factories in several countries doing the same. (Korea, Japan, Malaysia)?. I suppose they don't have its own factory at all.
They simply order their DACs in varies factories choosing the best offer. (the cheapest).
I think there is no quality standard. This is my opinion only. I may be wrong.


Absolutely right.
First - there is no such an animal - a chip without a sign,
Second - I have two matched pairs of brand new and unused PCM56P-K officially manufactured in Malaisia by BB and they have all the printings on them - year of production, number of the mfg line etc.
Third - I will never put them in my Havana.
Fourth - It is your money and your decision
 
Cheers
 
 

Users who are viewing this thread

Top