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| 型号： | ADE7761BARSZ-RL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 12/24页 |
| 文件大小： | 0K |
| 描述： | IC ENERGY METERING 1PHASE 20SSOP |
| 标准包装： | 1,500 |
| 输入阻抗： | 790 千欧 |
| 测量误差： | 0.1% |
| 电压 - 高输入/输出： | 2.4V |
| 电压 - 低输入/输出： | 0.8V |
| 电流 - 电源： | 3.65mA |
| 电源电压： | 4.75 V ~ 5.25 V |
| 测量仪表类型： | 单相 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-SSOP（0.209"，5.30mm 宽） |
| 供应商设备封装： | 20-SSOP |
| 包装： | 带卷 (TR) |
ADE7761B
Typical Connection Diagrams
Figure 15 shows a typical connection diagram for Channel V1.
The analog inputs are used to monitor both the phase and
neutral currents. Because of the large potential difference
between the phase and neutral, two current transformers (CTs)
must be used to provide the isolation. Note that both CTs are
referenced to analog ground (AGND); therefore, the common-
mode voltage is 0 V. The CT turn ratio and burden resistor (RB)
are selected to give a peak differential voltage of ±660 mV/gain.
R F V 1A
CT
Adjusting the level of MISCAL to calibrate the meter in missing
neutral mode can be done by changing the ratio of RC and
RD + VR1. When the internal reference is used, the values of RC,
RD, and VR1 must be chosen to limit the current sourced by
the internal reference sourcing current to below the specified
10 μA. Therefore, because V REF internal = 2.5 V, RC + RD +
VR1 > 600 kΩ.
INTERNAL OSCILLATOR
The nominal internal oscillator frequency is 450 kHz when
used with the recommended R OSC resistor value of 6.2 kΩ
IP
IN
AGND
RB
±660mV
GAIN
C F
between RCLKIN and DGND (see Figure 18).
ADE7761B
V 1N
RB
±660mV
GAIN
C F
2.5V
REFERENCE
3k ?
INTERNAL
OSCILLATOR
CT
R F
V 1B
9
14
17
Figure 15. Typical Connection for Channel V1
REF IN/OUT
R OSC
RCLKIN
DGND
Figure 16 shows two typical connections for Channel V2.
The first option uses a potential transformer (PT) to provide
complete isolation from the main voltage. In the second option,
the ADE7761B is biased around the neutral wire, and a resistor
divider is used to provide a voltage signal that is proportional to
the line voltage. Adjusting the ratio of RA and RB + VR is a
convenient way to carry out a gain calibration on the meter.
Figure 18. Internal Oscillator Connection
The internal oscillator frequency is inversely proportional to the
value of this resistor. Although the internal oscillator operates
when used with an R OSC resistor value between 5 kΩ and 12 kΩ,
it is recommended that a value be chosen within the range of
R F
V 2P
the nominal value.
RA 1
RB 1
VR 1
±660mV
AGND
C F
R F
R F
C F
C F
V 2N
V 2P
V 2N
The output frequencies on CF, F1, and F2 are directly propor-
tional to the internal oscillator frequency; therefore, Resistor R OSC
must have a low tolerance and low temperature drift. A low
tolerance resistor limits the variation of the internal oscillator
frequency. A small variation of the clock frequency and, conse-
quently, of the output frequencies from meter to meter contributes
to a smaller calibration range of the meter.
A low temperature drift resistor directly limits the variation of
C T
1 RB + VR = RF.
Figure 16. Typical Connections for Channel V2
Figure 17 shows a typical connection for the MISCAL input.
The voltage reference input (REF IN/OUT ) is used as a dc reference
to set the MISCAL voltage.
the internal clock frequency over temperature. The stability of
the meter to external variation is then better ensured by design.
REF IN/OUT
RC
RD
VR1
C F
MISCAL
R F
V 2N
C F
Figure 17. Typical Connection for MISCAL
Rev. 0 | Page 12 of 24
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