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ADE7880 Datenblatt(PDF) 29 Page - Analog Devices

Teilenummer ADE7880
Bauteilbeschribung  Polyphase Multifunction Energy Metering IC
PDF  104 Pages
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Hersteller  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

ADE7880 Datenblatt(HTML) 29 Page - Analog Devices

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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
30
35
40
45
50
55
60
65
70
FREQUENCY (Hz)
30
35
40
45
50
55
60
65
70
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
VIN
VN
ANALOG INPUT RANGE
ANALOG OUTPUT RANGE
0x514791 =
+5,326,737
ZX SIGNAL
DATA RANGE
0V
0xAEB86F =
–5,326,737
0x514791 =
+5,326,737
VOLTAGE CHANNEL
DATA RANGE
0V
0xAEB86F =
–5,326,737
+0.5V/GAIN
–0.5V/GAIN
0V
LPF1
Figure 48. Voltage Channel Datapath



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