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EVAL-AD7751/AD7755EB
JUMPER SELECTION
The AD7751/AD7755 evaluation board comes with several
jumper selections that allow the user to exercise all of the
AD7751 and AD7755 functionality. There are also some op-
tions such as attenuation networks and optically isolated outputs
that allow the AD7751 and AD7755 to be evaluated under the
same conditions as the end application. Table I outlines all the
jumper options and explains how they are used. Table I should
be used in conjugation with Figure 9, which will make it easier
to locate the jumper in question.
Table I.
Jumper
JP7
JP8
Option
Closed
Open
Closed
Description
Closing this jumper will short resistors
R53 and R54. The analog input V2P is
connected directly to SK1A. This has the
effect of removing the antialias filter and
attenuation network from this input. Note:
if the board is being connected to a high
voltage, this jumper must be left open.
Antialias filter and attenuation network on
the input V2P is enabled.
Analog input V1A is connected to analog
Jumper
JP1
Option
Closed
Description
Closing this jumper will short resistor R50
and connect analog input V1A directly to
SK2A. This has the effect of removing the
antialias filters from this input.
Open
ground (AGND) via the antialias filter.
Note: SK1A is also connected to AGND
and care should be taken if this input is
connected to a high voltage source.
Normal operation.
Open
Antialias filter in input V1A is enabled.
JP9
Closed
Closing this jumper will short resistor R57
JP2
Closed
Open
Analog input V1A is connected to analog
ground (AGND) via the antialias filter.
Normal operation.
Open
and connect analog input V2N directly to
SK2B. This has the effect of removing the
antialias filters from this input.
Antialias filter in input V2N is enabled.
JP3
JP4
Closed
Open
Closed
Closing this jumper will short resistor R51
and connect analog input V1N directly to
SK2B. This has the effect of removing the
antialias filters from this input.
Antialias filter in input V1A is enabled.
Analog input V1N is connected to analog
ground (AGND) via the antialias filter.
This jumper should be closed if the AD7751
is being used as these inputs are used
JP10
JP11
Closed
Open
N
Analog input V2N is connected to analog
ground (AGND) via the antialias filter.
This option should be selected if Channel
2 is being used in a single-ended mode.
V2N connected to SK2B for differential
operation.
SK1B connected to V2N (AD7751/
AD7755).
single-ended on the AD7751.
P
SK1B connected to V2P (AD7751/
Open
When evaluating the AD7755, Channel 1
AD7755).
is best used in a differential mode and this
jumper should be left open. An example is
shown in Figure 4. In this example a shunt
is used to sense the current. The shunt can
be referenced to the AGND of the board
by using TP11 as shown.
JP12
JP13
A
B
Open
Logic input AD/ DC is connected to
DGND.
Logic input AD/ DC is connected to
DVDD.
AD7751/AD7755 internal (on-chip) refer-
JP5
Closed
Closing this jumper will short resistor R52
and connect analog input V1B (V1P
AD7755) directly to SK2C. This has the
effect of removing the antialias filters from
JP14
Closed
1
0
ence selected.
External (AD780) reference selected.
SCF connected to DVDD.
SCF connected to DGND.
Open
this input.
Antialias filter in input V1A (V1P) is
enabled.
JP15
1
0
S1 connected to DVDD.
S1 connected to DGND.
JP6
Closed
Analog input V1B (V1P) is connected to
JP16
1
S0 connected to DVDD.
analog ground (AGND) via the antialias
0
S0 connected to DGND.
filter.
JP17
1
G1 connected to DVDD.
Open
Normal operation.
–6 –
JP18
0
1
0
G1 connected to DGND.
G0 connected to DVDD.
G0 connected to DGND.
REV. 0
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