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Advise needed for low voltage opamp selection
Advise needed for low voltage opamp selection
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Old 11th October 2018, 09:10 AM   #11
Barsk is offline Barsk  Sweden
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Originally Posted by OlegSh View Post
I also recommend OPA1688 without On/Off switch. Its quiescent current is so low that it has practically no influence on power consumption of your setup.
Ah, what you are proposing is to have the headphone amp On at all times even when no plug is inserted? Didn't think of that really! But is the power draw really equal to quiescent current levels when input has audio playing?
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Old 11th October 2018, 09:18 AM   #12
WoodyLuvr is offline WoodyLuvr  Thailand
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The OPA1688 (consuming 1.6mA idle current per side) when linked with the new and extremely efficient TI TPS3701 comparator drops that down to just ~7-8uA of idle current... it would take over 30,000 hours to run down a lithium 9V cell on idle! By the way, this comparator supplies voltages down to 1.8V!
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Last edited by WoodyLuvr; 11th October 2018 at 09:22 AM.
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Old 11th October 2018, 10:18 AM   #13
Barsk is offline Barsk  Sweden
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Originally Posted by WoodyLuvr View Post
The OPA1688 (consuming 1.6mA idle current per side) when linked with the new and extremely efficient TI TPS3701 comparator drops that down to just ~7-8uA of idle current... it would take over 30,000 hours to run down a lithium 9V cell on idle! By the way, this comparator supplies voltages down to 1.8V!
WoodyLuvr, I'm not sure how you propose this device will solve the problem. And it is in a not-so-friendly SOT-6 package of about 3x1.6mm in size...
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Old 11th October 2018, 10:20 AM   #14
Barsk is offline Barsk  Sweden
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WoodyLuvr, I'm not sure how that device helps?
And it is in a not-so-friendly SOT-6 package (3x1.6mm)...
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Old 11th October 2018, 05:04 PM   #15
Preamp is offline Preamp  Germany
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Originally Posted by Barsk View Post
But is the power draw really equal to quiescent current levels when input has audio playing?
Sure. As long as there's no load connected to the output.
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Old 11th October 2018, 06:17 PM   #16
Barsk is offline Barsk  Sweden
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Originally Posted by Preamp View Post
Sure. As long as there's no load connected to the output.
Ok! Thanks. I would have thought so, but needed to make sure.
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Old 13th October 2018, 05:32 AM   #17
benb is offline benb  United States
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The feedback resistor is also a load that the output drives, so that has to be taken into account. But (presuming it's a reasonable value resistor) it won't cause nearly as much current draw as a headphone.
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