LM3875 at low gain

[dsavitsk]

Has anybody tried using one of these chips at low or even unity gain? Are they stable? Any thoughts or advice?

I would like to use a SRPP preamp/driver stage but the gain will be too high normally, but at low gain it should work very well -- if the chip is stable.

-d

 

[Nuuk]

No they are not stable at low gain. If you want a low gain GC, use something like the OPA541/549.

 

[ash_dac]

Hi,

In the LM3875 datasheet figure 2 they show additional compensation capacitance to reduce HF ac gain. I assume the LM3875 is compensated for gains greater than 10.

Can the LM3875 be compensated for lower gains ?

I was thinking about a LM3875 regulated-LM3875 amplifier...

edit:- never realised how sensitive these chips are...picking up fluorescent noise!