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Old 19th August 2004, 02:26 PM   #1
XTAL is offline XTAL  Hong Kong
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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.
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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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