參數(shù)資料
型號(hào)： AD7751
廠商： Analog Devices, Inc.
英文描述： Energy Metering IC with On-Chip Fault Detection(高精度容錯(cuò)電子能量測(cè)量芯片)
中文描述： 電能計(jì)量IC片故障檢測(cè)（高精度容錯(cuò)電子能量測(cè)量芯片）
文件頁(yè)數(shù)： 8/16頁(yè)
文件大小： 287K
代理商： AD7751
AD7751
8
PRELIM B1 1098
TABLE I
Maximum
differential Signal
G1
G0
Gain
0
0
1
1
0
1
0
1
1
2
8
16
±660mV
±330mV
±82mV
±41mV
Typical Connection Diagrams
Figure 3 below shows a typical connection diagram
for Channel V1. Here the analog inputs are being
used to monitor both the Phase and Neutral currents.
Because of the large potential difference between the
phase and neutral, two CTs (current transformers)
must be used to provide the isolation. Notice both
CTs are referenced to AGND (analog ground), hence
the common mode voltage is 0V. The CT turns ratio
and burden resistor (Rb) are selected so as to give a
peak differential voltage of ±660mV/Gain.
+
-
V1A
V1N
±660mV
Gain
AGND
+
-
V1B
±660mV
Gain
CT
CT
Rb
Rb
Rf
Rf
Cf
Cf
IP
IN
Figure 3. Typical connection for Channel 1
Figure 4. shows two typical connections for Channel
V2. The first option uses a PT (potential transformer)
to provide complete isolation from the mains voltage.
In the second option the AD7751 is biased around
the neutral wire and a resistor divider is used to
provide a voltage signal which is proportional to the
line voltage. Adjusting the ratio of Ra and Rb is also a
convenient way of carrying out a gain calibration on
the meter.
+
-
V2P
V2N
±330mV
AGND
Rf
Rf
Cf
Cf
+
-
V2P
V2N
Ra*
Rf
Cf
Cf
Rb*
*Ra // Rb = Rf
Figure 4. Typical connections for Channel 2
ANALOG INPUTS
Channel V2 (Voltage Channel)
The output of the line voltage transducer is connected to the
AD7751 at this analog input. Channel V2 is a fully differential
voltage input. The maximum peak differential signal on
Channel 2 is ±660mV. Figure 1 illustrates the maximum signal
levels which can be connected to the AD7751 Channel 2.
+
-
V2P
V2N
V2
+660mV
-660mV
V
CM
Differential Input
±660mV max
peak
V2
AGND
V
CM
Common mode
±100mV max
+
_
+
_
Figure 1. Maximum signal levels, Channel 2
Channel 2 must be driven from a common mode voltage, i.e.
the differential voltage signal on the input must be reference to
a common mode (usually AGND). The analog inputs of the
AD7751 can be driven with common mode voltages of up to
100mV with respect to AGND. However best results are
achieved using a common mode equal to AGND.
Channel V1 (Current Channel)
The voltage outputs from the current transducers are connected
to the AD7751 here. Channel V1 has two voltage inputs,
namely V1A and V1B. These inputs are fully differential with
respect to V1N. However, at any one time only one is selected
to perform the power calculation—see Fault Detection.
The analog inputs V1A, V1B and V1N have the same maxi-
mum signal level restrictions as V2P and V2N. However
Channel 1 has a programmable gain amplifier (PGA) with user
selectable gains of 1, 2, 8 or 16—see Table I. These gains
facilitate easy transducer interfacing.
+
-
V1
V1N
V1A, V1B
+660mV
Gain
-660mV
Gain
VCM
AGND
VCM
Common mode
±100mV max
+
-
V1B
Differential Input B
±660mV/Gain max peak
Differential Input A
±660mV/Gain max peak
+
+
+
V1
Figure 2. Maximum signal levels, Channel 1
The diagram in figure 2 illustrates the maximum signal levels
on V1A, V1B and V1N. The maximum differential voltage is
±660mV divided by the gain selection. Again the differential
voltage signal on the inputs must be referenced to a common
mode, e.g. AGND.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AD7751AAN 制造商:Analog Devices 功能描述: 制造商:Rochester Electronics LLC 功能描述:PRODUCT TO FREQUENCY CONV - Bulk
AD7751AAN-REF 制造商:Analog Devices 功能描述:
AD7751AARS 制造商:Rochester Electronics LLC 功能描述:PRODUCT TO FREQUENCY CONV - Bulk
AD7751ABRS 制造商:AD 制造商全稱:Analog Devices 功能描述:Energy Metering IC With On-Chip Fault Detection
AD7751AN 制造商:Rochester Electronics LLC 功能描述:PRODUCT TO FREQUENCY CONV - Bulk
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