Electronics > Projects, Designs, and Technical Stuff
What is your favorite most versatile op-amp?
Neomys Sapiens:
My preferred OPA in the specified class is the LT1468/1469. It did prove repeatedly to be care free and rock solid when used to the full extent of it's capabilities. It is available in PDIP. But you would have to compromise on some parameters: Input bias current is slightly higher and output current is +/-22mA nominal.
I would fully endorse the AD845 too as well as the OPA2727.
Some other components to look at: ADA4898, LM6142, OPA602, OPA827, TLE2027, ISL55001 (I have not checked all parameters, but they are >10MHz, around 1 mV or better and they satisfy your +/-15V requirement.)
Maybe LM7332, if current is critical.
MasterT:
Recently I discovered LM4562, it has 100x (!!!) lower distortion level than NE5532. And 5.5 times wider bandwidth and available in DIP8 package.
IC is good with 5V power, capable to output about 3 Vp-p no distortion, for comparison NE5532 outputs 2 Vp-p.
exe:
There are several NE5532 on the market, at least two from on semi and TI. Rumors say they are quite different. They are also different from different years of manufacture. I think I found on the Internet that TI did at least once shrinkage of the die. This badly affected noise (according to the.
As for distortion, I wouldn't care that much. According to Rod Elliot distortion of any good sound amplifier (not just opamp, but the whole circuit) is inaudible. So, 100x reduction of inaudible distortion is still inaudible :).
PS did someone mention this document? http://www.nanovolt.ch/resources/ic_opamps/pdf/opamp_distortion.pdf . An interesting reading with tons of plots showing how opamps compare to each other in terms of distortion under different operating conditions. I refrain myself from drawing any conclusions as final performance is depends a lot on the circuit.
Zero999:
--- Quote from: MasterT on June 08, 2019, 10:54:59 pm ---Recently I discovered LM4562, it has 100x (!!!) lower distortion level than NE5532. And 5.5 times wider bandwidth and available in DIP8 package.
IC is good with 5V power, capable to output about 3 Vp-p no distortion, for comparison NE5532 outputs 2 Vp-p.
--- End quote ---
According to the data sheet, it's got over double the input current noise of the NE5532 at 1kHz, so it's not necessarily an improvement.
MasterT:
From NE5532 DS TI : Equivalent Input Noise Voltage: 5 nV/√Hz Typ at 1 kHz
OnSemi: Input Noise Voltage: 5.0 nVń Ǹ Hz (Typical)
LM4562 TI : Input Noise Density: 2.7nV/√Hz (typ)
Regarding distortion, audio is not the only area for OPA application, measurements is another. To have anything above 4.5 digits, OPA must be very low distortion. THD level at 0.002% put a limit same as 15-bits ADC
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