OPA637/627 THD Measurements?

johnferrier · 29th December 2003, 06:26 PM

Has anyone seen or have low level THD measurements for the OPA637/627?

The TI datasheet has measurements for +10/-10V (whatever that means for sure), but nothing at say 1Vrms. Douglas Self has graphs for 3Vrms.

Anyway I'd be interested in measurements 1Vrms and 0.1Vrms at 1khz and 10khz with a 600 or 1k ohm load.

I'm trying to decide whether to go discrete or not. I'm aware that the discrete circuit does well at lower signal levels, but have no idea what the OPA637/27 does at lower levels...

Thanks for any input or suggestions.

JF

ojg · 29th December 2003, 09:47 PM

At these low signal levels, noise will be dominate over distortion so it is important to select appropriate Rf, Rg and source resistors. The gain is also important, and the distortion will be different in inverting or non-inverting mode.

PMA · 30th December 2003, 06:41 PM

I have done some OPA627 THD spectra measurements, please have a look at my web page.

29th December 2003, 06:26 PM	#1
johnferrier diyAudio Member Join Date: Sep 2003 Location: WA	OPA637/627 THD Measurements? Has anyone seen or have low level THD measurements for the OPA637/627? The TI datasheet has measurements for +10/-10V (whatever that means for sure), but nothing at say 1Vrms. Douglas Self has graphs for 3Vrms. Anyway I'd be interested in measurements 1Vrms and 0.1Vrms at 1khz and 10khz with a 600 or 1k ohm load. I'm trying to decide whether to go discrete or not. I'm aware that the discrete circuit does well at lower signal levels, but have no idea what the OPA637/27 does at lower levels... Thanks for any input or suggestions. JF

30th December 2003, 06:41 PM	#3
PMA diyAudio Member Join Date: Apr 2002 Location: Prague, Kitakyushu, Fukuoka	OPA627 THD measurement I have done some OPA627 THD spectra measurements, please have a look at my web page.

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29th December 2003, 09:47 PM	#2
ojg diyAudio Member Join Date: May 2003 Location: Norway	At these low signal levels, noise will be dominate over distortion so it is important to select appropriate Rf, Rg and source resistors. The gain is also important, and the distortion will be different in inverting or non-inverting mode.

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