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New DAC based on AK4497EQ
New DAC based on AK4497EQ
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Old 4th October 2016, 09:33 PM   #11
clay-speakers is offline clay-speakers  Australia
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AKM have now confirmed the AK4497EQ is in production but the runrate is very small.
Minimum order quantity is 160 pcs @ $25 US per chip. Also not available from DigiKey at this stage.
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Old 4th October 2016, 09:39 PM   #12
chris719 is online now chris719  United States
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New DAC based on AK4497EQ
This chip has a "heavy load" drive mode (HLOAD) but the datasheet does not indicate if there is any downside to using it .
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Old 6th October 2016, 12:29 AM   #13
zenelectro is offline zenelectro  Australia
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Quote:
Originally Posted by chris719 View Post
This chip has a "heavy load" drive mode (HLOAD) but the datasheet does not indicate if there is any downside to using it .
Yes, there are quite a few interesting features to be explored.

WRT heavy load setting, hard to know, maybe there are changes in OP stage
bias to allow more dissipation. In that case performance would be worse but
it's just a guess. Measure / listen will tell the answer.

T
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Old 6th October 2016, 03:43 AM   #14
ChuckT is offline ChuckT
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Quote:
Originally Posted by clay-speakers View Post
Hi Terry,
great to hear from you.
That is interesting info regarding the AK4497EQ. I notice the total current draw is a lot higher that the AK4490EQ too but no option to bump up the analogue supply to 7.2v
Doing that certainly improved the sound on my 4490 DAC.
Yes love the Jensen OP transformer but you are right - expensive.
Photo of my AK4497EQ prototype - sounding good - just need a good DSD 512 test track
regards
Clay
Attachment 571972
I have a Jensen jt11p with the ak4495, it sound pretty darn good.
One thing about transformers is that a lot of them ring (I have measured a few with a scope). For Jensen jt11p I use their recommended snubber 13k + 620pf across the secondary and the measurement looks good, you might want to check the snubber value for your your Jensen.
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Old 8th October 2016, 07:02 AM   #15
clay-speakers is offline clay-speakers  Australia
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Hi Chuck,
Thanks for that info. I will fire up the scope & see how a square wave looks.
The transformers I am using are Jensen JT-11-FLCF. 1:1 standard 600/600 ohm output transformers. My board has no output stage so the transformers were just a quick lash up to have a listen. Currently no snubber or loading on the secondary but I have to admit it sounds pretty good as is.
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Old 8th October 2016, 11:54 AM   #16
kazap is offline kazap  Australia
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Quote:
Originally Posted by clay-speakers View Post
Hi Chuck,
.....I have to admit it sounds pretty good as is.
I wonder if you can tell if this better measuring chip actually sounds better then the earlier AK series? Cheers
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Old 25th October 2016, 10:30 AM   #17
cubano is offline cubano
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Hi everybody,
where have you buy the ak4497 chip?
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Old 26th October 2016, 07:20 PM   #18
Albrerta is offline Albrerta  Canada
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check this out

AK4497EQ DAC kit / official standard balanced line I2S/DSD Decoder kit L1610-36 | eBay
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Old 30th November 2016, 07:21 AM   #19
BigKahuunaBob is offline BigKahuunaBob
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Seems as if the AK4497 is available: AK4497EQ AKM Semiconductor Inc. | Integrated Circuits (ICs) | DigiKey
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Old 30th November 2016, 08:03 AM   #20
cubano is offline cubano
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Originally Posted by BigKahuunaBob View Post
awsome
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