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EVAL-AD7751/AD7755EB
Jumper
JP19
Option
A
Description
CF logic output connected to optically
Jumper
JP51
Option
A
Description
Trim pot R31 is connected to V2P (de-
isolated output at SK5.
pending on the position of JP50)—see
B
CF logic output connected to LED.
Figure 1. This allows the AD7751/
JP20
Closed
AVDD and DVDD connected together.
AD7755 output frequency to be scaled
using the voltage on V2P.
JP21
JP22
Closed
Closed
DVDD and VCC connected together.
Output FAULT (NC on AD7755) is
connected to DGND via R7. JP22 should
be closed when using the AD7755.
B
When option B is selected, the jumper JP52
should be left open. In this configuration
the attenuation for V2P is provided via the
fixed resistors R53, R54, R55 and R56.
Open
Should be open when evaluating the
JP52
Open
When open, the attenuation on V2P is
AD7751. Leaving closed will disable the
FAULT LED.
provided by fixed resistor as explained
above. Also see Figure 1.
JP50
N
SK1A connected to V2N (AD7751/
Closed
When closed, the trim pot becomes part of
AD7755).
the attenuation network. In this mode of
P
SK1A connected to V2P (AD7751/
AD7755).
operation the resistor R55 should be re-
moved from its PCB jack sockets.
JP1
JP21
JP12
JP22
JP2
JP4
JP3
JP20
A
B
JP6
JP51A
JP52
JP5
JP51B
JP7
JP8
N
P
JP50
JP13
A B
JP19
N P
JP9
JP10
JP11
1
0
Figure 9. AD7751/AD7755 Evaluation Board Jumper Positions
REV. 0
–7 –
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