Datasheet

Data Sheet ADE7854/ADE7858/ADE7868/ADE7878
Rev. G | Page 77 of 100
SILICON ANOMALY
This anomaly list describes the known issues with the ADE7854, ADE7858, ADE7868, and ADE7878 silicon identified by the version
register (Address 0xE707) being equal to 2, to 4, and to 5.
Analog Devices, Inc., is committed, through future silicon revisions, to continuously improve silicon functionality. Analog Devices tries
to ensure that these future silicon revisions remain compatible with your present software/systems by implementing the recommended
workarounds outlined here.
ADE7854/ADE7858/ADE7868/ADE7878 FUNCTIONALITY ISSUES
Silicon Revision
Identifier
Chip Marking Silicon Status Anomaly Sheet No. of Reported Issues
Version = 2 ADE7854ACPZ Released Rev. A 4 (er001, er002, er003, er004)
ADE7858ACPZ
ADE7868ACPZ
ADE7878ACPZ
Version = 4 ADE7854ACPZ Released Rev. B 1 (er005)
ADE7858ACPZ
ADE7868ACPZ
ADE7878ACPZ
Version = 5 ADE7854ACPZ Released Rev. C 1 (er005)
ADE7858ACPZ
ADE7868ACPZ
ADE7878ACPZ
FUNCTIONALITY ISSUES
Table 25. Offset RMS Registers Cannot be Set to Negative Values [er001, Version = 2 Silicon]
Background
When the AIRMSOS, AVRMSOS, BIRMSOS, BVRMSOS, CIRMSOS, CVRMSOS, and NIRMSOS registers are set to a negative
value, for sufficiently small inputs, the argument of the square root used in the rms data path may become negative. In
this case, the corresponding AIRMS, AVRMS, BIRMS, BVRMS, CIRMS, or CVRMS rms register is automatically set to 0.
Issue
Negative values for the AIRMSOS, AVRMSOS, BIRMSOS, BVRMSOS, CIRMSOS, CVRMSOS, and NIRMSOS registers are not
supported in the silicon version identified by the version register being equal to 2.
Workaround
Do not use negative values for the AIRMSOS, AVRMSOS, BIRMSOS, BVRMSOS, CIRMSOS, CVRMSOS, and NIRMSOS
registers.
If further details on this issue are required, please use the following website to submit your query:
www.analog.com/en/content/technical_support_page/fca.html.
Related Issues
None.