Question
Can I use an external voltage reference of the ADE7912/ADE7913 or
ADE7932/ADE7933?
Answer
No because the isolated dc to dc converter integrated into the devices was not
designed to support external circuitry on the isolated side.
ADE7912
Production
The ADE7912 / ADE7913 are isolated, 3-channel Σ-Δ ADCs for a variety of applications such as shunt-based polyphase meters, power quality monitoring...
Datasheet
ADE7912 on Analog.com
Question
Can I use an external voltage reference of the ADE7912/ADE7913 or
ADE7932/ADE7933?
Answer
No because the isolated dc to dc converter integrated into the devices was not
designed to support external circuitry on the isolated side.