dc offset problem

Archived from groups: rec.audio.tech (More info?)

When i use the digital output of the A/D converter AD192 of the preamp
PRESONUS
EUREKA i get a DC offset that produce a low freq noise (about 0 to 10
hz)of -40 db . Is that normal ? Is the converter broken ? when i
connect the analog output
to my audio card there is no dc offset . To be sure that the problem is
only in the a/d converter of the presonus eureka i tried the digital
output with 2 audio card , the echo layla 24 and a soundblaster live ,
and i found the same problem .