ADE7953 datasheet(22/68 Pages) AD

22 / 68 page

ADE7953

Data Sheet

Rev. A | Page 22 of 68

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

temperature (see the Specifications section). The value of the tem-

perature drift may vary slightly from part to part. A drift of x% in

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.

VGAIN

REFERENCE

HPFEN BIT

CONFIG[2]

DSP

ACTIVE AND REACTIVE

POWER CALCULATION

VOLTAGE PEAK,

OVERVOLTAGE,

SAG DETECTION

VWAVEFORM

SAMPLING REGISTER

VOLTAGE RMS (VRMS)

CALCULATION

HPF

ADC

PGA

ZX DETECTION

PGA_V BITS

×1, ×2, ×4, ×8, ×16

VIN

LPF1

Figure 41. Voltage Channel ADC and Signal Path

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