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ADE7953
REFERENCE CIRCUIT
The ADE7953 has an internal voltage reference of 1.2 V nominal,
which appears on the REF pin. This reference voltage is used by
the ADCs in the ADE7953 . The REF pin can be overdriven by
an external source, for example an external 1.2 V reference. The
voltage of the ADE7953 internal reference drifts slightly over
Data Sheet
the reference results in a 2x% deviation in meter accuracy. The
reference drift is typically minimal and is usually much smaller
than the drift of other components in the meter. By default, the
ADE7953 is configured to use the internal reference. If Bit 0 of
the EX_REF register (Address 0x800) is set to 1, an external
voltage reference can be applied to the REF pin.
temperature (see the Specifications section). The value of the tem-
perature drift may vary slightly from part to part. A drift of x% in
VOLTAGE PEAK,
OVERVOLTAGE,
SAG DETECTION
DSP
HPFEN BIT
VOLTAGE RMS (VRMS)
CALCULATION
VP
V IN
PGA_V BITS
×1, ×2, ×4, ×8, ×16
PGA
REFERENCE
ADC
xVGAIN
CONFIG[2]
HPF
V WAVEFORM
SAMPLING REGISTER
ACTIVE AND REACTIVE
POWER CALCULATION
VN
Figure 41. Voltage Channel ADC and Signal Path
Rev. B | Page 22 of 72
LPF1
ZX DETECTION
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