ADE7880 datasheet(29/104 Pages) AD

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Data Sheet

ADE7880

Rev. A | Page 29 of 104

–30

–15

–20

–25

–89.96

–89.97

–89.98

–89.99

FREQUENCY (Hz)

Figure 47. Combined Gain and Phase Response of the

Digital Integrator (40 Hz to 70 Hz)

As stated in the Current Waveform Gain Registers section, the

serial ports of the ADE7880 work on 32-, 16-, or 8-bit words.

Similar to the registers shown in Figure 43, the DICOEFF 24-bit

signed register is accessed as a 32-bit register with four MSBs

padded with 0s and sign extended to 28 bits, which practically

means it is transmitted equal to 0x0FFF8000.

When the digital integrator is switched off, the ADE7880 can

be used directly with a conventional current sensor, such as

a current transformer (CT).

VOLTAGE CHANNEL ADC

Figure 48 shows the ADC and signal processing chain for

Input VA in the voltage channel. The VB and VC channels

have similar processing chains. The ADC outputs are signed

twos complement 24-bit words and are available at a rate of

8 kSPS. With the specified full-scale analog input signal of

±0.5 V, the ADC produces its maximum output code value.

Figure 48 shows a full-scale voltage signal being applied to the

differential inputs (VA and VN). The ADC output swings

between −5,326,737 (0xAEB86F) and +5,326,737 (0x514791).

Note these are nominal values and every ADE7880 varies

around these values.

AVGAIN[23:0]

REFERENCE

HPFEN BIT

CONFIG3[0]

DSP

TOTAL/FUNDAMENTAL

ACTIVE AND REACTIVE

POWER CALCULATION

VOLTAGE PEAK,

OVERVOLTAGE,

SAG DETECT

VAWV WAVEFORM

SAMPLE REGISTER

CURRENT RMS (VRMS)

CALCULATION

HPF

ADC

PGA3

VAP

ZX DETECTION

PGA3 BITS

GAIN[8:6]

×1, ×2, ×4, ×8, ×16

VIN

ANALOG INPUT RANGE

ANALOG OUTPUT RANGE

0x514791 =

+5,326,737

ZX SIGNAL

DATA RANGE

0xAEB86F =

–5,326,737

0x514791 =

+5,326,737

VOLTAGE CHANNEL

DATA RANGE

0xAEB86F =

–5,326,737

+0.5V/GAIN

–0.5V/GAIN

LPF1

Figure 48. Voltage Channel Datapath

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