Link Configuration Options - Analog Devices EVAL-AD4080-FMCZ User Manual

User Guide
SUPPORTED CONFIGURATIONS

LINK CONFIGURATION OPTIONS

The EVAL-AD4080-FMCZ contains multiple solder links, jumpers,
and a switch array to enable various configurations on the evalua-
Table 3. Amplifier Power Mode and Power Down Switch Array (S1) Functionality
Switch Function
S1-1 Stage 1 amplifier U1 enable or disable
S1-2 Stage 1 amplifier U2 enable or disable
S1-3 Stage 3 A1 and A6 enable or disable
S1-4 Stage 2 FDA power mode select
Table 4. Solder Link Settings: Analog Front End
Default
Link Pads Function
JP3 Pad 2 to Selects the signal connected to Pin 16 (digital ground, D
Pad 3 U3). This pin is the ground reference for the disable signal. By default, R124 is
bridging Pad 2 to Pad 3; therefore, Pin 16 of U3 is connected to the AGND of the
hardware.
JP4 Pad 2 to Selects the signal connected to Pin 5 (power mode selection, MODE) of the FDA
Pad 3 (ADA4945-1, U3).By default, R125 is bridging Pad 2 to Pad 3; therefore, Pin 5 of U3 is
connected to the PMSEL signal.
JP5 Pad 2 to Selects the signal connected to Pin 8 of the FDA. For the ADA4945-1 (U3), Pin 8 is
Pad 3 used to select the positive clamp voltage. By default, R126 is bridging Pad 2 to Pad 3;
therefore, Pin 8 of U3 is connected to REF.
JP6 Pad 2 to Selects the signal connected to Pin 13 of the FDA. For the ADA4945-1 (U3), Pin 13
Pad 3 selects the negative clamp voltage. By default, R127 bridges Pin 2 to Pin 3; therefore,
Pin 13 of U3 is connected to AGND.
JP7 and Pad 2 to Enables a path to AGND or VOCM at the negative input node of the FDA (U3). By
JP14 Pad 3 default, this pin is connected to AGND.
JP15 and Pad 2 to Selection of the input path to Stage 3 amplifiers (ADA4899-1, A1 and A6). By default,
JP16 Pad 3 the input is connected to the output of Stage 2.
JP17 and Pad 2 to Selects the input path of the ADC to be connected to either the output of Stage 2 or
JP18 Pad 3 the output of Stage 3. By default, Stage 3 is connected to the ADC input.
JP19 No link Selects the source of the power supply for Pin 3 of the AMC connector (P1).
JP20 No link Selects the source of the power supply for Pin 5 of the AMC connector (P1).
Table 5. Solder Link Settings: External Reference Buffering
Link Default Function
JP1 and JP1: 1-2 and Selection of the buffered or unbuffered path for the external voltage
JP2 JP2: 2-3 reference output signal, VREF. The default is the unbuffered path.
Table 6. Solder Link Settings: Common-Mode Buffering
Link Default Function
JP8 and 1-2 Selection path for the
JP9 default, the unbuffered path is selected.
analog.com
GND
AD4080 common-mode output signal between the buffered and unbuffered. By
tion hardware. Table 3 through
and default settings of these components.
S1 Closed (ON)
U1 disabled
U2 disabled
A1 and A6 disabled
Low power mode
Comment
) of the FDA (ADA4945-1, Change the connection to Pad 1 to Pad2 to connect Pin
16 to VSSDRV and remove R124. Apply change when
swapping the ADA4945-1 for ADA4932-1.
Change the connection to 1-2 to connect Pin 5 to
VDDDRV and remove R125. Apply change when swapping
ADA4945-1 for ADA4932-1.
Change to Pad 1 to Pad2 to connect Pin 8 to VDDDRV and
remove R126. Apply change when swapping ADA4945-1
for ADA4932-1.
Change to 1-2 to connect Pin 13 to VSSDRV and
remove R127. Apply change when swapping ADA4945-1
for ADA4932-1.
Keep this link in the Pad 1 to Pad2 position. This position,
along with the fitting of R78 and R29, can be used to apply
gain in Stage 1 through the R5, R7, R8, and R9 resistors.
Connect both across Pad 1 to Pad 2 to ground the Stage 3
inputs. Apply this change when disabling Stage 3.
Change both to Pad 1 to Pad 2 to connect the input of
the ADC to the Stage 2 output. Apply this change when
disabling Stage 3.
See the
See the
Comment
Change link JP1 to 2-3 and JP2 to 1-2 to enable the buffered path. Note
that the external reference buffer is not necessary and not recommended.
EVAL-AD4080
Table 8 summarize the functions
Stage 3 Bypass section
Stage 3 Bypass section
Comment
Connect across 2-3 to select the buffered
path
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