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EVAL-AD7751/AD7755EB
ANALOG INPUTS (SK1 AND SK2)
Voltage and current signals are connected at the screw terminals
SK1 and SK2 respectively. All analog input signals are filtered
using the on-board antialias filters before being presented to the
analog inputs of the AD7751 or AD7755. Some analog inputs
offer additional signal conditioning, e.g., attenuation on the
If Channel 2 is being used in a single-ended mode of operation,
the unused input of the pair should be connected to analog
ground (AGND) via an antialias filter. This is shown in Figure 2
where V2N is connected to AGND using jumper JP10.
JP9
voltage channel. The default component values shipped with
the evaluation board are the recommended values to be used
with the AD7751 and AD7755. The user can easily change
these components, however this is not recommended unless the
user is familiar with sigma-delta converters and also the criteria
JP10
R57
C54
TP5
V2N
used for selecting the analog input filters—see AD7751 and
AD7755 data sheets.
Voltage Input
SK1 is a two-way connection block that can be directly con-
nected to a high voltage source, e.g., 220 V rms. The resistor
network R53, R54, R55, R56 and R31 make up a very flexible
attenuation and calibration network—see schematic. The attenua-
tion network is designed such that the corner frequency (–3 dB
frequency) of the network matches that of the RC (antialiasing)
filters on the other analog inputs. This is important, because if
they do not match there will be large errors at low power fac-
tors. Figure 1 shows how the attenuation network may be used
with fixed resistors or the trim pot. The trim pot allows the
voltage signal on V2P to be scaled to calibrate the frequency on
CF to some given constant, e.g., 3200 imp/kWhr. Some ex-
amples are given later.
Figure 2. Unused Analog Inputs Connected to AGND
All passive components (resistors and capacitors) which make
up the attenuation network and antialias filters may be modified
by the user. The components at mounted using PCB jack sockets
which allow for easy removal and replacement of components.
Current Input
SK2 is a three-way connection block which allows the AD7751/
AD7755 to be connected to a current transducer. The AD7751
has three inputs which are used with two current transducers,
e.g., two CTs (current transformers). The AD7755 has one
differential input channel for connection to the current trans-
ducer, i.e., two inputs. When using the AD7755 in the evalua-
tion board the input SK2A is not used. PCB jack sockets allow
CT burden resistors to be placed on the evaluation board at
positions SH1 and SH2. Figures 3 and 4 show some typical
connection diagrams for CT and shunt connection.
JP7
JP1
SK1A
R53
R54
R55
JP52
R31
A
B
V2P
CT
SK2A
SH1
R50
JP2
JP3
TP1
C50
V1A
AD7751
JP8
C53
R56
JP51
SK2B
R51
JP4
TP2
C51
V1N
SH2
JP5
a. Attenuation Using Trim Pot (R31)
CT
SK2C
R52
TP3
V1B
C52
JP7
BURDEN RESISTORS
SK1A
R53
JP52
Figure 3. Typical Connection for Channel 1 of the AD7751
R54
R55
R31
A
B
V2P
JP1
R50
TP1
NC
JP8
C53
R56
JP51
SH1
JP2
JP3
C50
AD7755
b. Attenuation Using Fixed Resistors
SK2B
R51
JP4
TP2
C51
V1N
Figure 1. Attenuation Network on Channel 2
SHUNT
SH2
JP5
SK2C
R52
TP3
V1P
C52
TP11
AGND
NC = NO CONNECT
Figure 4. Typical Connection for Channel 1 of the AD7755
–2 –
REV. 0
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