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Old 19th August 2004, 02:26 PM   #1
XTAL is offline XTAL  Hong Kong
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Join Date: Oct 2003
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Default BurrBrown OPA627

Dear All,
Recently, I build my DAC . I want to use OPA627 as I/V and LPF.
Is it right? Or OPA627 as I/V, OPA134 as LPF(like TI reference circuit)? If I use 627 as LPF, what value of cap & resistor of the feedback circuit?

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Old 19th August 2004, 03:02 PM   #2
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The cap and resistor as far as I know just set the parameters of the lowpass filter, the opamp doesnt make any difference.

With some opamps stability is a concern so some may use a cap here and there to aid that, but in most applications you can just plug and play with any opamps you choose.
What the hell are you screamin' for? Every five minutes there's a bomb or somethin'! I'm leavin! bzzzz! Now with website! www.5een.co.uk under construction.
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Old 21st August 2004, 07:49 PM   #3
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OPA 627 is the better device, however unless you have really top class ancillary equipment you would be unlikely to tell the difference. The OPA134 is an excellent device and a lot cheaper. Any differences will be only noticeable if you use correct grounding , interference suppression and follow the power supply recomendations in the data sheet.
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