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OPA1656: High-Performance CMOS Audio Op Amp
OPA1656: High-Performance CMOS Audio Op Amp
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Old 24th November 2020, 07:49 PM   #401
HpW is offline HpW
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Quote:
Originally Posted by syn08 View Post
OPA1656 is less noisy than the OPA827, 2.9nV/rtHz vs. 4nV/rtHz both flat.
See attached, Jan is using the opamp for his project MRK 3 input box (input attenuation & gain) prior an ADC for measurement purposes

Currently it is not clear, how the measurement (customer) setup was really done... balanced input & output of his upcoming gear

While did many noise simulation with LTSpice for a SVF notch (state variable filter) and the winner was always the OPA827 even in LTSpice FFT graphs.

Hp
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File Type: png Noise OPA827 vs OPA1656.png (19.5 KB, 99 views)
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Old 24th November 2020, 10:49 PM   #402
syn08 is offline syn08  Canada
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What should I look at? OPA1656 is clearly lower noise.

If you believe some simulation results over the datasheets that's your choice (and problem, I would say).

Last edited by syn08; 24th November 2020 at 11:12 PM. Reason: Typo fixed.
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Old 24th November 2020, 11:02 PM   #403
MarcelvdG is offline MarcelvdG  Netherlands
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1652?
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Old 24th November 2020, 11:44 PM   #404
chris719 is offline chris719  United States
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OPA1656: High-Performance CMOS Audio Op Amp
Quote:
Originally Posted by syn08 View Post
What should I look at? OPA1656 is clearly lower noise.

If you believe some simulation results over the datasheets that's your choice (and problem, I would say).
It is, wideband, for sure. Maybe he's talking about 1/f or strictly in a 20 kHz bandwidth where it may be close due to the higher noise corner.
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Old 24th November 2020, 11:58 PM   #405
syn08 is offline syn08  Canada
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Which is why I started the OP with:

Quote:
Originally Posted by syn08 View Post
Not sure if we have the same understanding of "noise figure"
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