收藏本站
ADE7753
2.42V
× 1, × 2, × 4,
× 8, × 16
REFERENCE
V2P
{GAIN [7:5]}
V2
V2N
PGA2
ADC 2
LPF1
ACTIVE AND REACTIVE
ENERGY CALCULATION
VRMS CALCULATION
AND WAVEFORM
V1
ANALOG
INPUT RANGE
0.5V, 0.25, 0.125,
62.5mV, 31.25mV
0V
0x2852
0x2581
LPF OUTPUT
WORD RANGE
SAMPLING
(PEAK/SAG/ZX)
0x0000
0xDAE8
0xD7AE
02875-0-054
Figure 55. ADC and Signal Processing in Channel 2
VOLTAGE SIGNAL (V(t))
0x2518
VRMOS[11:0]
0x0
0xDAE8
sgn 2 9 2 8
2 2 2 1 2 0
VRMS[23:0]
CHANNEL 2
LPF1
|x|
LPF3
+
+
0x17D338
0x00
02875-0-0055
Figure 56. Channel 2 RMS Signal Processing
Channel 2 has only one analog input range (0.5 V differential).
Like Channel 1, Channel 2 has a PGA with gain selections of 1,
2, 4, 8, and 16. For energy measurement, the output of the ADC
is passed directly to the multiplier and is not filtered. An HPF is
not required to remove any dc offset since it is only required to
remove the offset from one channel to eliminate errors due to
offsets in the power calculation. When in waveform sampling
mode, one of four output sample rates can be chosen by using
Bits 11 and 12 of the mode register. The available output sample
the voltage channel. The conversion from the register value to
volts must be done externally in the microprocessor using a
volts/LSB constant. Since the low-pass filtering used for
calculating the rms value is imperfect, there is some ripple noise
from 2 ω term present in the rms measurement. To minimize
the noise effect in the reading, synchronize the rms reading
with the zero crossings of the voltage input.
Table 8.
rates are 27.9 kSPS, 14 kSPS, 7 kSPS, or 3.5 kSPS—see the Mode
Register (0x09) section. The interrupt request output IRQ
95%
220 ms
100%
670 ms
signals that a sample is available by going active low. The timing
is the same as that for Channel 1, as shown in Figure 52 .
Channel 2 RMS Calculation
Figure 56 shows the details of the signal processing chain for the
rms estimation on Channel 2. This Channel 2 rms estimation is
done in the ADE7753 using the mean absolute value calculation, as
shown in Figure 56. The Channel 2 rms value is processed from
the samples used in the Channel 2 waveform sampling mode.
The rms value is slightly attenuated because of LPF1. Channel 2
rms value is stored in the unsigned 24-bit VRMS register. The
update rate of the Channel 2 rms measurement is CLKIN/4.
With the specified full-scale ac analog input signal of 0.5 V, the
output from the LPF1 swings between 0x2518 and 0xDAE8 at
60 Hz—see the Channel 2 ADC section. The equivalent rms
value of this full-scale ac signal is approximately 1,561,400
(0x17D338) in the VRMS register. The voltage rms measure-
ment provided in the ADE7753 is accurate to within ±0.5% for
signal input between full scale and full scale/20. Table 8 shows
the settling time for the VRMS measurement, which is the time
Channel 2 RMS Offset Compensation
The ADE7753 incorporates a Channel 2 rms offset compensation
register (VRMSOS). This is a 12-bit signed register that can be
used to remove offset in the Channel 2 rms calculation. An
offset could exist in the rms calculation due to input noises and
dc offset in the input samples. The offset calibration allows the
contents of the VRMS register to be maintained at 0 when no
voltage is applied. One LSB of the Channel 2 rms offset is
equivalent to one LSB of the rms register. Assuming that the
maximum value from the Channel 2 rms calculation is
1,561,400d with full-scale ac inputs, then one LSB of the
Channel 2 rms offset represents 0.064% of measurement
error at –60 dB down of full scale.
VRMS = VRMS 0 + VRMSOS (6)
where VRMS 0 is the rms measurement without offset correction.
The voltage rms offset compensation should be done by testing
the rms results at two non-zero input levels. One measurement
can be done close to full scale and the other at approximately
full scale/10. The voltage offset compensation can be derived
it takes for the rms register to reflect the value at the input to
Rev. C | Page 26 of 60
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*
相关PDF资料
EVAL-ADE7754EBZ BOARD EVALAUTION FOR ADE7754
EVAL-ADE7755ZEB BOARD EVALUATION FOR AD7755
EVAL-ADE7758ZEB BOARD EVAL FOR AD7758
EVAL-ADE7759EBZ BOARD EVALUATION FOR ADE7759
EVAL-ADE7762EBZ BOARD EVALUATION FOR ADE7762
EVAL-ADE7763ZEB BOARD EVALUATION FOR ADE7763
EVAL-ADE7816EBZ BOARD EVALUATION FOR ADE7816
EVAL-ADE7878EBZ BOARD EVAL FOR ADE7878
相关代理商/技术参数
EVAL-ADE7754EB 制造商:Analog Devices 功能描述:EVALUATION BOARD FOR POWER METERING, POLYPHASE MULTIFUNCTION ENERGY METERING IC WITH SERIAL PORT 制造商:Analog Devices 功能描述:PWR METERING, POLYPHASE MULTIFUNCTION ENERGY METERING IC W/ - Bulk
EVAL-ADE7754EBZ 功能描述:BOARD EVALAUTION FOR ADE7754 RoHS:是 类别:编程器，开发系统 >> 评估演示板和套件 系列:- 标准包装:1 系列:- 主要目的:电信，线路接口单元（LIU） 嵌入式:- 已用 IC / 零件:IDT82V2081 主要属性:T1/J1/E1 LIU 次要属性:- 已供物品:板，电源，线缆，CD 其它名称:82EBV2081
EVAL-ADE7755EB 制造商:Analog Devices 功能描述:EVAL BOARD ENERGY METERINGW/PULSE OUTPUT - Bulk
EVAL-ADE7755EBZ 制造商:AD 制造商全称:Analog Devices 功能描述:Energy Metering IC with Pulse Output
EVAL-ADE7755EBZ1 制造商:AD 制造商全称:Analog Devices 功能描述:Energy Metering IC with Pulse Output
EVAL-ADE7755ZEB 功能描述:BOARD EVALUATION FOR AD7755 RoHS:是 类别:编程器，开发系统 >> 评估演示板和套件 系列:- 标准包装:1 系列:- 主要目的:电信，线路接口单元（LIU） 嵌入式:- 已用 IC / 零件:IDT82V2081 主要属性:T1/J1/E1 LIU 次要属性:- 已供物品:板，电源，线缆，CD 其它名称:82EBV2081
EVAL-ADE7756EB 制造商:Analog Devices 功能描述:EVAL BD DOCUMENTATION ADE7756 ENERGY METERING IC - Bulk 制造商:Rochester Electronics LLC 功能描述:
EVAL-ADE7757AEBZ 制造商:Analog Devices 功能描述:EVALUATION BOARDS - Bulk