Good 5 volt opamp?

LukasLouw · 30th September 2006, 03:02 PM

Can anyone reccommend a good unit gain stable dual opamp running off a single +5v supply to run a CS5341 analog to digital converter?

The ADC's input impedance is 25K, and needs 1Vrms, or 2.8Vp-p for full scale output.

Thanks,
Lukas

peufeu · 30th September 2006, 08:24 PM

What is the input capacitance of the ADC ?

(is. is it a sigma-delta or a sample and hold ?)

LukasLouw · 30th September 2006, 09:18 PM

Quote:

Originally posted by peufeu
What is the input capacitance of the ADC ?

(is. is it a sigma-delta or a sample and hold ?)

Delta-sigma type.

Interestingly enough, input capacitance isn't specified, or at least I can't find it on the datasheet. However, teh DO reccommend 2700 pF from each analog input to gound.

Lukas

peufeu · 1st October 2006, 08:32 PM

OK. I asked because sample&hold ADCs, well, sample and hold the signal, which means they store it in a capacitor, and if the input opamp can't handle it, you have a problem.

Apart from that, I have no idea, but I'd suggest looking at the opamps used by people to power portable headphone gear at head-fi.com

jackinnj · 1st October 2006, 09:55 PM

Take a look at the OPA365 from Texas Instruments.

30th September 2006, 03:02 PM	#1
LukasLouw diyAudio Member Join Date: Sep 2002 Location: Colonia, NJ	Good 5 volt opamp? Can anyone reccommend a good unit gain stable dual opamp running off a single +5v supply to run a CS5341 analog to digital converter? The ADC's input impedance is 25K, and needs 1Vrms, or 2.8Vp-p for full scale output. Thanks, Lukas

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30th September 2006, 08:24 PM	#2
peufeu diyAudio Member Join Date: Mar 2001 Location: Lyon, France	What is the input capacitance of the ADC ? (is. is it a sigma-delta or a sample and hold ?)

1st October 2006, 08:32 PM	#4
peufeu diyAudio Member Join Date: Mar 2001 Location: Lyon, France	OK. I asked because sample&hold ADCs, well, sample and hold the signal, which means they store it in a capacitor, and if the input opamp can't handle it, you have a problem. Apart from that, I have no idea, but I'd suggest looking at the opamps used by people to power portable headphone gear at head-fi.com

1st October 2006, 09:55 PM	#5
jackinnj diyAudio Member Join Date: Apr 2002 Location: Llanddewi Brefi, NJ	Take a look at the OPA365 from Texas Instruments.

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