Good to hear 🙂 glad that you have provided your listening impressions of the part. I guess I am going to have to design something to make use of the part, a new pre-amp comes to mind, for another time.
Funny, how at the bottom of my page, they are advertising the Burson "Supreme Sound V5 Audio Opamp" and I believe the OPA1656 is just as good, if not better, at a fraction of the price. But it has a lifetime warranty 🙂
Funny, how at the bottom of my page, they are advertising the Burson "Supreme Sound V5 Audio Opamp" and I believe the OPA1656 is just as good, if not better, at a fraction of the price. But it has a lifetime warranty 🙂
Did ypu usedit as a single or in a dual configuration??
While waiting for the promised single opa1655 😀
Hp
As in the past it was used as dual in my rig but there only the final output stage was biased - so only class A biased on the B / second op-amp section of OPA1656, the one that is supposed to give the most sonic signature in my rig.
TBH, would have tried on both sections if I would have liked the result, but I didn't, hence leaving things as they are 🙂
Claude
TBH, would have tried on both sections if I would have liked the result, but I didn't, hence leaving things as they are 🙂
Claude
LTSpice model of OPA1656
I am currently looking for the LTSpice model (.cir file) of this OPA1656...
And may some comments about simulated and real performance graphs 😀
While currently use for simulation on a notch the ADA4627 single 😀 😀
Hp
I am currently looking for the LTSpice model (.cir file) of this OPA1656...
And may some comments about simulated and real performance graphs 😀
While currently use for simulation on a notch the ADA4627 single 😀 😀
Hp
There are SPICE models on ti.com for the OPA1656. I expect that the PSPICE model can be made to work by you in LTSpice, but TI isn't going to supply it to you.
Hi John
Yes, did it my way…
1. Copied the given .lib file into the related LTSPice folder
2. Added a new OPA1656.asy using the ADA4627 as a template
3. Altered text
SYMATTR Value OPA1656
SYMATTR Prefix X
SYMATTR SpiceModel OPA1656.lib
SYMATTR Value2 OPA1656
SYMATTR Description TI/BB Audio FET Opamp
to get the same symbols as the ordenary Opamp
4. on LTSpice load, the lengthy lib update happend.
5. Tested within my Notch, and noise figures now different and FFT figures better
6. The real question rises: How the simulated results will match with real HW implementation
Now waiting for the announcement of the single OPAMP 1655...
When will this happen ??
Hp
When TI gets an order for enough parts to require the fab to build 300 wafers per week for 52 weeks.
That's roughly 300 x 52 x 50,000? That really seems over the top (780 million chips ;-)
Unless it was tongue-in-cheek ...
Jan
Unless it was tongue-in-cheek ...
Jan
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First the OPA1655 should be announce to provide milk, otherwise customers threatens with ordering…
IMHO, it would replace the LME49710 smoothly.. 😀
Hp
I'm sure TI builds their analog ICs on 12 inch diameter wafers; each one has a surface area of 113 square inches. We can assume the opamp die size is roughly comparable to the competitor device "AD848", namely 0.067" x 0.054" = 3.6E-3 square inches per die. So there are approximately 31,200 die sites on a 12 inch diameter wafer --- if we pretend there are no partial die around the perimeter, where the wafer's curved edge cuts through the middle of a rectangular die.
Then we merely plug in estimates for
- Line_Yield = (# Good, non broken wafers out of fab) / (# Wafers started)
- Probe_Yield = (# die that pass all probe tests at wafer level) / (# die sites)
- Assembly_Yield = (# packaged parts that pass visual inspection) / (# die into assembly)
- Final_Test_Yield = (# sellable packaged parts that pass Etest) / (# parts into test)
and, presto, we get the number you seek.
It's (deliberately) big, so big that TI could not possibly refuse to accept the order and pay for all necessary infrastructure additions, to build the parts.
_
Attachments
I was just remembering that the 8 inch wafer Stuart and I got was supposed to have 50,000+ OPA1656's ...
But yes there's the yield.
Jan
But yes there's the yield.
Jan
A bit of a clarification, there should be something closer to 25,000 OPA1656s per wafer.
Not all analog processes have moved to 300mm (12 inch) wafers. Regardless, OPA1656 is on a fairly mature process that has been around for over a decade. The successor process, which is on 300 mm, was not ready at the time I was working on OPA1656.
I can tell you about my experience with a sample I got from TI, sound quality wise, the OPA827 is way better than OPA828, but just few days ago I received samples of OPA1656, sound wise very close to OPA827, both are great opmps.
Exactly! I'll be using the TLV320ADC6140 in my project due to it's absolute simplicity (that's how I found this thread). I'm also using the PCM5242 for the same reason. An even higher end PCM5242 with a built in headphone amp (and/or speaker amp) option would be nice. It fits within the "TLV320" series to do something like that. Like maybe a "TLV320DAC5242" of sorts, with a balanced line driver, plus headphone, plus maybe a small amplifier. So a total of 8 output pins (Balanced, HP, AMP). That would be a real nice part! I realize that some of this exists kinda, but more of the low-end "98dB" quality stuff. Let's get one in the 110-130 range. 🙂
Hi johnc124,
Still no news for the single unit, OPA1656 like OpAmp?
Thank you and kind regards!