收藏本站

ADE7754
TERMINOLOGY
Measurement Error
The error associated with the energy measurement made by the
ADE7754 is defined by the formula
Percentage Error =
AV DD
5V
4V
?
?
× 100% ?
? Energy Registered by ADE 7754 ? True Energy
True Energy
?
?
0V
TIME
Phase Error Between Channels
The HPF (high-pass filter) in the current channel has a phase
POWER-ON
ACTIVE
INACTIVE
lead response. To offset this phase response and equalize the
phase response between channels, a phase correction network is
placed in the current channel. The phase correction network
ensures a phase match between the current channels and voltage
channels to within ± 0.1 ° over a range of 45 Hz to 65 Hz and
± 0.2 ° over a range of 40 Hz to 1 kHz. This phase mismatch
between the voltage and the current channels can be reduced
further with the phase calibration register in each phase.
Power Supply Rejection
This quantifies the ADE7754 measurement error as a percentage
of reading when power supplies are varied. For the ac PSR mea-
surement, a reading at nominal supplies (5 V) is taken. A second
reading is obtained using the same input signal levels when an ac
(175 mV rms/100 Hz) signal is introduced onto the supplies. Any
error introduced by this ac signal is expressed as a percentage of
reading. See the Measurement Error definition above.
For the dc PSR measurement, a reading at nominal supplies
(5 V) is taken. A second reading is obtained using the same
input signal levels when the power supplies are varied ± 5%. Any
error introduced is again expressed as a percentage of reading.
ADC Offset Error
This refers to the dc offset associated with the analog inputs to
the ADCs. It means that with the analog inputs connected to
AGND, the ADCs still see a dc analog input signal. The magni-
tude of the offset depends on the gain and input range selection
(see the TPCs). However, when HPFs are switched on, the
offset is removed from the current channels and the power
calculation is unaffected by this offset.
Gain Error
The gain error in the ADE7754 ADCs is defined as the differ-
ence between the measured ADC output code (minus the
offset) and the ideal output code. See the Current Channel
ADC and the Voltage Channel ADC sections. The difference is
expressed as a percentage of the ideal code.
RESET FLAG IN
THE INTERRUPT
STATUS REGISTER
READ RSTATUS
REGISTER
Figure 4. On-Chip Power Supply Monitoring
The RESET bit in the interrupt status register is set to Logic 1
when AV DD drops below 4 V ± 5%. The RESET flag is always
masked by the interrupt enable register and cannot cause the
IRQ pin to go low. The power supply and decoupling for the
part should ensure that the ripple at AV DD does not exceed 5 V
± 5% as specified for normal operation.
ANALOG INPUTS
The ADE7754 has six analog inputs, divisible into two chan-
nels: current and voltage. The current channel consists of three
pairs of fully differential voltage inputs: I AP , I AN ; I BP , I BN ; and
I CP , I CN . The fully differential voltage input pairs have a maxi-
mum differential voltage of ± 0.5 V. The voltage channel has
three single-ended voltage inputs: V AP , V BP , and V CP . These
single-ended voltage inputs have a maximum input voltage of
± 0.5 V with respect to V N . Both the current channel and the
voltage channel have a PGA (programmable gain amplifier) with
possible gain selections of 1, 2, or 4. The same gain is applied to
all the inputs of each channel.
The gain selections are made by writing to the gain register. Bits 0
and 1 select the gain for the PGA in the fully differential current
channel. The gain selection for the PGA in the single-ended volt-
age channel is made via Bits 5 and 6. Figure 5 shows how a gain
selection for the current channel is made using the gain register.
GAIN[7:0]
Gain Error Match
Gain error match is defined as the gain error (minus the offset)
obtained when switching between a gain of 1, 2, or 4. It is
expressed as a percentage of the output ADC code obtained
I AP , I BP , I CP
GAIN (k)
SELECTION
under a gain of 1.
V IN
k
V IN
POWER SUPPLY MONITOR
The ADE7754 contains an on-chip power supply monitor. The
analog supply (AV DD ) is continuously monitored by the ADE7754.
If the supply is less than 4 V ± 5%, the ADE7754 goes into an
inactive state (i.e., no energy is accumulated when the supply
voltage is below 4 V). This is useful to ensure correct device
operation at power-up and during power-down. The power sup-
ply monitor has built-in hysteresis and filtering, providing a high
degree of immunity to false triggering due to noisy supplies.
REV. 0
–9 –
I AN , I BN , I CN
Figure 5. PGA in Current Channel
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-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
EVAL-ADE7880EBZ BOARD EVAL FOR ADE7880
相关代理商/技术参数
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
EVAL-ADE7757EB 制造商:Analog Devices 功能描述:EVAL BOARD ENERGY METERINGW/PULSE OUTPUT - Bulk
EVAL-ADE7758ZEB 功能描述:BOARD EVAL FOR AD7758 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:PSoC® 主要目的:电源管理，热管理 嵌入式:- 已用 IC / 零件:- 主要属性:- 次要属性:- 已供物品:板，CD，电源