参数资料
| 型号： | EVAL-ADE7755ZEB |
| 厂商： | Analog Devices Inc |
| 文件页数： | 3/12页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION FOR AD7755 |
| 标准包装： | 1 |
| 主要目的： | 电源管理，电度表/功率表 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | ADE7755 |
| 主要属性： | 最高 240 VAC，5 V 电源，监控器相位和中性线电流 |
| 次要属性： | 超过 IEC687/1036 标准，误差率低于 0.1%，故障输出 |
| 已供物品： | 板 |
| 相关产品： | ADE7755ARSZ-ND - IC ENERGY METERING 1PHASE 24SSOP ADE7755ARSZRL-ND - IC ENERGY METERING 1PHASE 24SSOP |
EVAL-AD7751/AD7755EB
AD7751/AD7755 EVALUATION BOARD SETUP
Figure 5 shows how the AD7751/AD7755 evaluation board can
be set up for a simple evaluation. Two signal generators are
used to provide the sinusoidal (ac) signals for Channel 1 and
Channel 2. The user must have some way of phase locking the
generators. This will ensure that the sinusoidal signals remain in
phase. Also if the AD7751 and AD7755 performance-over-power
factor is being evaluated, two separate signal sources will be
required. The generators are shown connected in a single-ended
configuration. The grounded analog inputs of Channel 1 and
Channel 2 (V1N and V2N) are connected to AGND via an
antialias filter. In Figure 5, analog input V2N is grounded via
R55 and R56. The capacitor C53 is connected in parallel.
JP1
LOGIC OUTPUTS
AD7751 and AD7755 provide the active power information in
the form of an output frequency. The three frequency outputs
are F1, F2 and CF. Consult the AD7751 and AD7755 data
sheets for more information on these outputs. The logic outputs
F1 and F2 are intended to be used to drive an impulse counter
or stepper motor. The outputs are buffered and available at the
connector SK6. A stepper motor may be directly connected
here. The power supply for the buffer is VCC (SK4A) and may
be connected to either the AD7751/AD7755 supply using
jumper JP21, or to its own supply.
The logic output CF can be directly connected to an LED using
JP19 (Position B) or to an optically isolated output (Position A).
By closing Positions A and B, both options are selected. The
SK2A
R50
TP1
V1A
optically isolated output is available at connector SK5. This
50Hz
200mV
SK2B
SH1
JP2
JP3
R51
C50
TP2
V1N
isolated output is useful when the evaluation board is connected
directly to a high voltage (e.g., 220 V residential). A typical con-
nection diagram for this isolated output is shown in Figure 6.
JP19
JP4
C51
A
B
SH2
JP5
VPLUS
SK5A
SK2C
R52
JP6
C52
TP3
V1B
R20
U4
R23
+
5V–12V
50Hz
200mV
SK1A
JP7
R53
JP52
H11L1
CFOUT
R22
SK5B
COUNTER
R54
R55
R31
A
TP4
N
V2N
GND
SK5C
JP8
C53
JP9
B
JP51
R56
P
JP50
V2P
Figure 6. Typical Connection for Opto Output
The logic output REVP indicates negative power measurement.
SK1B
R57
JP10
C54
TP5
N
P
JP11
Since the frequency outputs can only convey magnitude infor-
mation, the sign of the power calculation is given by the REVP
logic output. For more information regarding this output see the
AD7751/AD7755 data sheet. This output is connected to an
LED on the evaluation board. The LED will be illuminated if
Figure 5. Typical Connection for Analog Inputs
REV. 0
–3 –
negative power is detected.
The AD7751 also has a logic output called FAULT. This out-
put goes active when the signal levels on V1A and V1B differ by
more than 12.5% (see Figure 3). This output is also connected
to an LED on the evaluation board. Jumper J22 should be open
when evaluating the AD7751.
All logic outputs can be monitored via test points 6 to 10 (TP6
to TP10). These test points provide easy access for scope probes
and meter probes.
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