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Best Headphone Amp IC today?
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Old 8th September 2019, 03:47 PM   #11
Koifarm is offline Koifarm  Netherlands
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LME49600 and BUF634A are for me the best. Sounds both the same at my AKG K7XX se.
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Old 9th September 2019, 05:33 PM   #12
Mark Tillotson is offline Mark Tillotson
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AD8656 dual 5V opamp in BTL config is possibly a contender?
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Old 9th September 2019, 05:50 PM   #13
Pano is offline Pano  United States
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Best Headphone Amp IC today?
I've built several headphone amps with the TI TPA6120 and been very happy with it.
http://www.ti.com/document-viewer/TPA6120A2/datasheet

It's not really new, but it sure does work well. No problem driving some of my weird 8 or 16 ohm cans, as well as 32 ohm. Super low noise floor, clean and dynamic. With a decent +/- 15V supply my hunt for headphone amplification is over. Currently I use 2 of them for my collection of quadraphonic headphones.
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Old 10th September 2019, 02:11 PM   #14
drizdraz is offline drizdraz  United States
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Thanks everyone. GREAT replies - I would buy you all a beer.

For my purposes (low total parts cost, simplicity, small PCB area, low-noise) I'm leaning towards the T/I parts 1688 (US$0.75) and 1622 (US$2.90). I've ordered T/I eval boards and will do some critical A/B listening tests. Will use the best sounding part! The 1622 is clearly the superior part on paper ==> noise, drive current, capacitive drive, open-loop output impedance, thermal metrics, etc.

Last edited by drizdraz; 10th September 2019 at 02:18 PM.
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Old 11th September 2019, 01:50 AM   #15
RickTH is offline RickTH
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Quote:
Originally Posted by drizdraz View Post
Thanks everyone. GREAT replies - I would buy you all a beer.

For my purposes (low total parts cost, simplicity, small PCB area, low-noise) I'm leaning towards the T/I parts 1688 (US$0.75) and 1622 (US$2.90). I've ordered T/I eval boards and will do some critical A/B listening tests. Will use the best sounding part! The 1622 is clearly the superior part on paper ==> noise, drive current, capacitive drive, open-loop output impedance, thermal metrics, etc.
We're still talking about OPA1688 & OPA1622 ? Because at those prices you must be buying them 2000 at a time.
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Old 11th September 2019, 01:59 PM   #16
drizdraz is offline drizdraz  United States
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at those prices you must be buying them 2000 at a time.
Yes, modest production qtys.

Was also just looking at the INA1620, but (comparing specs) it appears to be a 1622 with four laser-trimmed ultra-tight resistors added to the die. Beautiful part, but more expensive, and I don't need the fancy resistors.

Last edited by drizdraz; 11th September 2019 at 02:04 PM.
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Old 11th September 2019, 02:49 PM   #17
RickTH is offline RickTH
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At 2,90$ , even I would take a crack at soldering them but it wouldn't solve the cooling problem.
Shame on Texas Instr for not putting them in a DPAK (TO252) for proper cooling , or even a TO39 , so they can ramp up the price threefold for a metal can.
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Old 11th September 2019, 03:24 PM   #18
drizdraz is offline drizdraz  United States
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it wouldn't solve the cooling problem
Yeah, tiny QFN / VSON packages aren't very thermal efficient, though the 1622's Rja at 47.6 C/W is manageable for my application (actually surprisingly good for the tiny pkg size). The 1620 is even better at 33.7 C/W. With a 125C operating spec, my app will never get close to max junction temp.
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Old 11th September 2019, 05:03 PM   #19
IVX is offline IVX  Ukraine
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8V/32ohm =250mA such current may handle just a few opamps, one of them AD8397. Relatively expensive, about $3 but if you'll get it no self-oscillating it could be near ideal HPA. I've got S/N -122dbA with ES9038Q2M and -123db harmonics level Review and Measurements of E1DA 9038S BAL Portable DAC & Amp | Audio Science Review (ASR) Forum
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Old 11th September 2019, 05:44 PM   #20
drizdraz is offline drizdraz  United States
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Originally Posted by IVX View Post
8V/32ohm =250mA such current may handle just a few opamps, one of them AD8397[/url]
Nice! But I wonder about ear health listening to headphones with peaks over 100dB SPL. 100mW into 32 ohm cans roughly translates into >115dB SPL. That's freaking dangerous! Seems like 100mW is plenty for everything but perhaps 8 ohm IEM users?

I'm good with addressing 98% of the market. And the 1622 is a beautiful part on paper -- can't wait to hear it. It doesn't get much better than 700nVrms broadband (20-20k) noise or -121dBu. I think that's close to the effective noise limit of CMOS technology.
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