qusp
Member of the Trade: Twisted Cables
- Joined
- Jun 18, 2008
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A qiuck question... are there any inherent flaws in using a chip like AD797 as a buffer? If it sounds good, y not?
yes, as ive covered here a number of times, its really not what I would call unity gain stable. they are stretching the truth in the datasheet, it needs a very well laid out and well executed PCB to make this work properly, its very prone to oscillation otherwise and not exactly happy driving capacitive loads (headphones), or low impedance loads*
basically it requires a heap of boxes ticked that are unlikely to be present on a PCB not designed for it
*its not exactly high in current, though higher than many, 30mA isnt exactly what I would expect from a buffer. For example the BUF634 or LME49600/10 put out 250mA and are truly unity gain stable.