I am looking for a high quality low noise opamp but with low power consumption. I think in the near past there was some new opamps published with better power consumption?
Its for a battery powered headphone system with a total of 5 Dual opamps.
Its for a battery powered headphone system with a total of 5 Dual opamps.
look up the Ti website and insert low quiescent opamp into the search.
You are likely to find results from 50uA upwards.
Or just google to see all manufacturers offerings.
You are likely to find results from 50uA upwards.
Or just google to see all manufacturers offerings.
Do you need duals? And do you need unity gain stable? If you want a single and don't mind min gain 14dB then TLE2161 has Iq=0.28mA for a 6.5MHz GBWP. Not spectacularly low noise though unless you're working with high source impedances (its a JFET).
Yes it must be unity gain stable and low noise. And should be dual package. The performance should match a lm4562 or similar. The opa2277 have to much distortion due its low power consumption.
I suggest you make a little table to hold the results of your research into manufacturer datasheets. I expect a five column table would be adequate: PartNumber, Noise(nV/rtHz), Power(mA), Price, QtyInStock .
Then I suggest you put the table into Excel and make a scatterplot of Noise versus Power. Obviously the goal is zero noise and zero power, so those datapoints which fall closest to the origin (Noise=0, Power=0) are the most desirable. Circle the two or three which look most desirable according to your personal tastes, verify that the price and availability are acceptable, done.
I'd recommend that you put the Old Warhorses (TL072, AD797, LM833, NE5532) into the table as well, just so you can quickly see how much better the new opamps have gotten, compared to the Old Warhorses. Have Excel plot the new ones as big green triangles on the scatterplot, and the Old Warhorses as big red circles.
Then I suggest you put the table into Excel and make a scatterplot of Noise versus Power. Obviously the goal is zero noise and zero power, so those datapoints which fall closest to the origin (Noise=0, Power=0) are the most desirable. Circle the two or three which look most desirable according to your personal tastes, verify that the price and availability are acceptable, done.
I'd recommend that you put the Old Warhorses (TL072, AD797, LM833, NE5532) into the table as well, just so you can quickly see how much better the new opamps have gotten, compared to the Old Warhorses. Have Excel plot the new ones as big green triangles on the scatterplot, and the Old Warhorses as big red circles.
What supply rails must it accept? If you're happy with 12V total then OPA890 has below 0.001% THD. Dual one is OPA2890, 1.1mA per amp Iq.
Last edited:
OPA1662 Low Iq, noise and distortion dual OP amp. From TI's "Sound Plus" series of high performance op amps. 1.8ma per amp.
It is powered from two 9V batteries, total 18v. opa1662 looks good, i have a simmilar opa1642. But i think BJT would match my requirements better.
- Status
- Not open for further replies.