Cirrus Logic AN300 REV1 - Manual (Page 11)

AN300REV1 11
AN300
Figure 15 illustrates the offset stability of the CS3001/2 over time. This plot was based upon band limiting the
amplifier to 3.2 Hz and measuring the amplifier output for an hour. The fact that the plot of the statistical distribu-
tion of the noise out of the amplifier over an hour remains Gaussian validates that the offset of the amplifier is not
moving over the time period.
Figure 15. Offset Voltage Stability (DC to 3.2 Hz)
The CS3001/2/11/12 and CS3003/4/13/14 devices all use chopping clock frequencies greater than 100 kHz. This
allows the clock to be more easily filtered on-chip.
Table 1 summarizes the typical amplifier specification parameters for the Cirrus Logic's chopper-stabilized amplifi-
ers.
Time (1 Hour)
-100
-75
-50
-25
0
25
50
75
100
nV
= nV
σ σ
= 13 nV