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Old 16th October 2012, 03:35 PM   #1
kp93300 is offline kp93300  Malaysia
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Default opa 2889 buffer circuit

Hi
I need some advice
See the schematic attached . This is from the datasheet of the opa2889.
The link for the datasheet is

http://www.ti.com/lit/ds/symlink/opa2889.pdf

I wish to use this op amp as buffer after a dac and before the amp. .
What does the label of V0 -DIS imply ?
If I want unity gain ,do i short R3?

much appreciated .
kp93300
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Old 16th October 2012, 04:11 PM   #2
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Quote:
Leaving this disable pin open, or holding it HIGH, operates the OPA2889 normally. If pulled LOW, the OPA2889 supply current drops to less than 20μA/ch while the output goes into a high-impedance state.
You didn't read the datasheet, first page?
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Old 17th October 2012, 12:45 AM   #3
kp93300 is offline kp93300  Malaysia
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Hi peranders
thanks for the info.
I read but i do not understand !

I am thinking of buying a few to play with it.

thanks

kp93300
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Old 17th October 2012, 05:23 AM   #4
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What is means is if you let this pin be unconnected, the opamp will work as expected. If you ground this pin the opamp will be shut off and also the output stage. In your case I'll suppose you should forget this pin.
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Old 17th October 2012, 11:06 AM   #5
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by kp93300 View Post
........... I want unity gain ,do i short R3?...............
What does the datasheet say?

That may be a clue to whether it can be used as a buffer.
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Old 17th October 2012, 01:38 PM   #6
kp93300 is offline kp93300  Malaysia
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Hi
thanks peranders and Andrew
The datasheet says it is unity gain stable,
I quote from the datasheet


1FEATURES
2• FLEXIBLE SUPPLY RANGE:
+2.6V to +12V Single Supply
± 1.3V to ± 6V Dual Supplies
• UNITY-GAIN STABLE
• WIDEBAND ± 5V OPERATION: 60MHz
(G = +2V/V)
• OUTPUT VOLTAGE SWING: ± 4V
• HIGH SLEW RATE: 250V/ µ s
• LOW QUIESCENT CURRENT: 460 µ A/ch
• LOW DISABLE CURRENT: 18 µ A/ch

thanks

kp93300
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