Datasheet
EVAL-AD5663REB
Rev. 0 | Page 3 of 12
EVALUATION BOARD HARDWARE
POWER SUPPLIES
To power the EVAL-AD5663REB, supply 5.5 V between
the AV
DD
and AGND inputs for the analog supply of the
AD5663R (J6). Alternatively, placing Link 6 in Position B
powers the analog circuitry from the USB port (default setting).
Both AGND and DGND inputs are provided on the board. The
AGND and DGND planes are connected at one location close
to the AD5663R. To avoid ground loop problems, it is
recommended not to connect AGND and DGND elsewhere in
the system.
Each supply is decoupled to the relevant ground plane with
10 μF and 0.1 μF capacitors. Each device supply pin is also
decoupled with a 10 μF and 0.1 μF capacitor pair to the relevant
ground plane.
LINK OPTIONS
A number of link and switch options on the evaluation board
should be set for the required operating setup before using the
board. The functions of these link options are described in
detail in
Table 2. The default setup is for control by the PC via
the USB port. The default link options are listed in
Table 1 .
Table 1. Link Options Setup for PC Control (Default)
Link No. Option
LK1 to LK2 Inserted
LK5 B
LK6 B
LK7 A
LK8 A
LK9 B
LK10 Removed
LK11 B
LK12 Not applicable
LK13 A
Table 2. Link Functions
Link No. Function
LK1, LK2
These links connect the V
OUT
A and V
OUT
B pins of the AD5663R to the input pins of ADG738 demultiplexer to monitor the DAC
output value using the on-board AD7476 ADC.
LK5 This link selects the AVDD power supply source for the analog circuitry.
• Position A selects J6 as the AVDD analog circuitry power supply source.
• Position B selects the 5 V power supply source as the AVDD analog circuitry power supply source (see LK6).
LK6 This link selects the 5 V power supply source for the digital circuitry.
• Position B selects the USB port as the 5 V digital circuitry power supply source.
• Position A selects J7 as the 5 V digital circuitry power supply source.
LK7
This link selects whether the AD5663R evaluation board is controlled by the PC via the USB port or by an external source via the
SMB connectors J1 to J5.
• Position A selects control by the PC via the USB port.
• Position B selects control by an external source via the SMB connectors J1 to J3.
LK8 This link sets the RESET pin on the ADG738.
• Position A allows normal operation of the switch.
• Position B resets the switch.
LK9 This link selects the AVDD power supply source for the REF195.
• Position A selects J6 as the REF195 power supply source.
• Position B selects the AVDD as the REF195 power supply source (see LK5).
LK10 This link connects a 0.1 μF capacitor to AGND on the V
REFOUT
pin. It is recommended to connect this when using the internal reference.
LK11 This link selects the reference source.
• Position A selects the internal reference as the reference source. The part must be written to via software to turn on
the internal reference.
• Position B selects the on-board REF195 5 V reference as the reference source.
LK12 Not applicable.
LK13 This link selects the DAC voltage source.
• Position A selects the AVDD analog circuitry power supply source.
• Position B selects the on-board REF195 5 V reference as the power supply source.