- AVDD is a 5-V regulated output which supplies internal circuits.
AVDD must be bypassed to AVSS with a 1-µF/10-V capacitor. Do not connect any
additional loads to AVDD.
- CVDD is a power supply for stack communication and tied to
internally as I/O power supply. CVDD supplies the stack daisy chain
communication transceiver circuit. Bypass CVDD with a 4.7 µF / 10 V and 100 nF
and 22 nF for improved emissions and performance. capacitor to CVSS.
- DVDD is a 1.8-V regulated output that is used to power the
digital logic inside the chip. Connect with a 1-μF/10-V capacitor to DVSS. Do
not connect any additional loads to DVDD.
- NEG5V is a -5-V supply provided by an internal charge pump.
Connect with a 0.1-µF/10-V capacitor to AVSS.
- REFHP is a precision reference output pin. A 1-µF/10-V bypass
capacitor must be connected from REFHP to REFHM directly for proper operation of
the part.
- REFHM is the precision reference ground for the internal
precision reference. Connect DVSS, CVSS, ADC_AVSS, REFHM, and AVSS externally.
All VSS pins must not be left unconnected.