Analog Devices EVAL-AD7091SDZ, User Manual

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Evaluation Board User Guide UG-447
Rev. 0 | Page 5 of 16
Table 2. Link Options
Category Link
Default
Position Function
Buffer
Settings LK1 A This link is used to select the analog signal path.
In Position A, the analog signal is buffered via U2, a unity gain buffer.
In Position B, the analog signal is buffered via U3, a unity gain buffer.
In Position C, the analog signal bypasses U2 and U3.
LK2 A This link is used to select the source of the analog input signal to the AD7091 .
In Position A, the analog signal is sourced via the U2 op amp.
In Position B, the analog signal is sourced via the U3 op amp.
In Position C, the analog signal bypasses U2 and U3.
Termination LK3 Inserted Adds a 51 Ω termination resistor to GND at VIN.
Inserted—51 Ω termination on the VIN input.
Not inserted—no 51 Ω termination on the VIN input.
LK4 Inserted Adds a 51 Ω termination resistor to GND at BIPOLAR_IN.
Inserted—51 Ω termination on the BIPOLAR_IN input.
Not inserted—no 51 Ω termination on the BIPOLAR_IN input.
Power
Supplies LK5 A This link is used to select the reference source for the bias up circuitry.
In Position A, the REF signal is sourced via the on-board reference chip.
In Position B, the REF signal is sourced via VDD.
LK6 A This link is used to select the source of the VDD supply line for the evaluation board
In Position A, the VDD supply is sourced from the on-board 3.3 V supply.
In Position B, the VDD supply is sourced from the external J702 connector.
LK800 A This link is used to select the source of the +OP_AMP supply line for the on-board amplifiers.
In Position A, the +OP_AMP supply is sourced from the on-board supply.
In Position B, the +OP_AMP supply is sourced from the external J800 connector.
LK801 A This link is used to select the source of the −OP_AMP supply line for the on-board amplifiers.
In Position A, the −OP_AMP supply is sourced from the on-board supply.
In Position B, the −OP_AMP supply is sourced from the external J800 connector.
SOCKETS/CONNECTORS
The connectors and sockets on the EVAL-AD7091SDZ are
outlined in Table 3.
The default interface to this evaluation board is via the 120-way
connector, which connects the
EVAL-AD7091SDZ to the EVAL-
SDP-CB1Z board.
TEST POINTS
There are numerous test points on the EVAL-AD7091SDZ
board. These test points enable the user to have easy access to
the signals from the evaluation board for probing, evaluation,
and debugging.
It is also possible to access the
AD7091 via the test points to
operate the EVAL-AD7091SDZ in standalone mode without the
need for the EVAL-SDP-CB1Z board.
Table 3. On-Board Connectors
Connector Function
J1 120-way connector for EVAL-SDP-CB1Z interface
J2 VIN analog input signal
J3 BIPOLAR_IN analog input signal to bias up circuit
J4 UNIPOLAR_OUT output of bias up circuit
J5 External reference voltage connector
J700 9 V, 2.0 mm dc jack connector
J701 External VCC and GND power connector
J702 External VDD and GND power connector
J800 Amplifier power connector