参数资料
| 型号： | EVAL-ADE7880EBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 42/104页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR ADE7880 |
| 标准包装： | 1 |
| 系列： | * |
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ADE7880
Voltage Channel RMS Calculation
rms calculation on one of the phases of the voltage channel. The
voltage channel rms value is processed from the samples used in
the voltage channel. The voltage rms values are signed 24-bit
values and they are stored into the Registers AVRMS, BVRMS,
and CVRMS. The update rate of the current rms measurement
is 8 kHz.
With the specified full-scale analog input signal of 0.5 V, the
ADC produces an output code that is approximately ±5,326,737.
The equivalent rms value of a full-scale sinusoidal signal is
3,766,572 (0x39792C), independent of the line frequency.
The accuracy of the voltage rms is typically 0.1% error from the
full-scale input down to 1/1000 of the full-scale input. Additionally,
2 7
Data Sheet
this measurement has a bandwidth of 3.3 kHz. It is
recommended to read the rms registers synchronous to the
voltage zero crossings to ensure stability. The IRQ1 interrupt
can be used to indicate when a zero crossing has occurred (see
the Interrupts section).
The V rms measurement settling time is 580 ms for both 50 Hz
and 60 Hz input signals. The V rms measurement settling time
is the time it takes for the rms register to reflect the value at the
input to the voltage channel when starting from 0.
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 register presented in Figure 57, the AVRMS,
BVRMS, and CVRMS 24-bit signed registers are accessed as
32-bit registers with the eight MSBs padded with 0s.
xVRMSOS[23:0]
VOLTAGE SIGNAL
FROM HPF
x 2
LPF
xVRMS[23:0]
0x14791 =
+5,326,737
0V
0xAEB86F =
–5,326,737
Figure 69. Voltage RMS Signal Processing
Rev. A | Page 42 of 104
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