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參數(shù)資料
| 型號： | AD7755 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Energy Metering IC with Pulse Output(帶脈沖輸出的高精度電子能量測量芯片) |
| 中文描述： | 電能計量IC脈沖輸出（帶脈沖輸出的高精度電子能量測量芯片） |
| 文件頁數(shù)： | 8/14頁 |
| 文件大?。?/td> | 260K |
| 代理商： | AD7755 |
AD7755
8
PRELIM B2 10/98
ANALOG INPUTS
Channel V1 (Current Channel)
The voltage output from the current transducer is connected to
the AD7755 here. Channel V1 is a fully differential voltage
input. V1P is the positive input with respect to V1N.
The maximum peak differential signal on Channel 1 should be
less than ±500mV for specified operation. Note Channel 1 has
a programmable gain amplifier (PGA) with user selectable gain
of 1, 2, 8 or 16—see Table I. These gains facilitate easy
transducer interfacing.
+
-
V1P
V1N
V1
+660mV
-660mV
V
CM
Differential Input
±660mV max
peak
V1
AGND
V
CM
Common mode
±100mV max
+
_
+
_
Figure 1. Maximum signal levels, Channel 1, Gain = 1
The diagram in figure 1 illustrates the maximum signal levels
on V1P and V1N. The maximium differential voltage is
±500mV divided by the gain selection. The differential voltage
signal on the inputs must be referenced to a common mode,
e.g. AGND.
TABLE I
Maximum
differential Signal
G1
G0
Gain
0
0
1
1
0
1
0
1
1
2
8
16
±500mV
±250mV
±62mV
±31mV
Channel V2 (Voltage Channel)
The output of the line voltage transducer is connected to the
AD7755 at this analog input. Channel V2 is a fully differential
voltage input. The maximum peak differential signal on
Channel 2 is ±500mV. Figure 2 illustrates the maximum signal
levels which can be connected to the AD7755 Channel 2.
+
-
V2P
V2N
V2
+660mV
-660mV
V
CM
Differential Input
±660mV max
peak
V2
AGND
V
CM
Common mode
±100mV max
+
_
+
_
Figure 2. 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 referenced
to a common mode(usually AGND). The analog inputs of the
AD7755 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.
Typical Connection Diagrams
Figure 3 below shows a typical connection diagram for Channel
V1. A CT (current transformer) is the current transducer
selected for this example. Notice the common mode volatge for
channel 1 is AGND and is derived by center tapping the
burden resistor to AGND. This provides the complemetary
analog input signals for V1P and V1N. The CT turns ratio and
burden resistor Rb are selected so as to give a peak differential
voltage of ±500mV/Gain at maximum load.
+
-
V1P
V1N
±660mV
Gain
AGND
CT
Rb
Rf
Rf
Cf
Cf
IP
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 AD7755 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
±660mV
AGND
Rf
Rf
Cf
Cf
+
-
V2P
V2N
Ra
Rf
Cf
Cf
Rb
Rc
Figure 4. Typical connections for Channel 2
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相關代理商/技術參數(shù) |
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|---|---|
| AD7755AAN | 制造商:Rochester Electronics LLC 功能描述:ENERGY METERING IC WITH P - Bulk |
| AD7755AAN-REF | 制造商:Analog Devices 功能描述: |
| AD7755AARS | 制造商:Rochester Electronics LLC 功能描述:ENERGY METERING IC WITH P - Bulk 制造商:Analog Devices 功能描述: |
| ad7755aarsrl | 制造商:Rochester Electronics LLC 功能描述:ENERGY METERING IC WITH P - Tape and Reel 制造商:Analog Devices 功能描述: |
| AD7755ABRS | 制造商:AD 制造商全稱:Analog Devices 功能描述:Energy Metering IC with Pulse Output |
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