AKD5394A Datasheet, PDF (8/32 Pages) Asahi Kasei Microsystems – 24bit A/D converter for professional audio

ASAHI KASEI
[AKD5394A]
„ When capacitors more than 10µF are connected between VREF pin and GND
The distortion at low frequency can be improved by connecting large capacitors C(Figure 6) to VREF pins. (Refer to
Figure 7) C is C10, C13, C56 and C58 in circuit diagram. However, when the capacitors of VREF pins are larger than
10µF, it is possibility that the offset calibration does not performed correctly if the offset calibration cycle is started right
after power-up. Because the internal VREF cannot settle to the appropriate voltage when the calibration cycle is
completed. In this case, the offset calibration cycle should be started again after the VREF voltage settled. (Figure 8) The
relationship between the capacitance and the VREF settling time is shown in Table 10.
C+
C+
0.22u
AK5394A
VREF+
VREF-
Figure 6. VREF circuit example(C is C10, C13, C56 and C58 in circuit diagram)
<KM064804>
-8-
2005/05