EVAL-AD5689R Datasheet, PDF (2/12 Pages) Analog Devices – PC control in conjunction with Analog Devices

EVAL-AD5689R / EVAL-AD5687R
Application Note
EVALUATION BOARD HARDWARE
POWER SUPPLIES
To power the AD5689R/87R evaluation board supply 6V
between the +6V and AGND inputs of the evaluation board.
Both AGND and DGND inputs are provided on the board. The
AGND and DGND planes are connected at one location close
to the AD5689R/87R. It is recommended not to connect AGND
and DGND elsewhere in the system to avoid ground loop
problems.
All supplies are decoupled to ground with 10 µF tantalum and
0.1 µF ceramic capacitors.
Table 1. Power Supply Connectors
Connector No. Voltage
J1
Analog positive power supply, VDD.
J2
Digital positive power supply, VDD.
J3
+6V board positive power supply, VDD.
Supply 6V for board operation.
LINK OPTIONS
A number of link and switch options are incorporated in the
evaluation board and should be set for the required operating
setup before using the board. The functions of these link options
are described in detail in Table 3. Table 2 describes the positions
of the different links to control the evaluation board by PC, via
the USB port and SDP board in single-supply mode.
Table 2. Link Options Setup for SDP Control (Default)
Link No.
Options
LK1
A
LK2
A
LK3
C
LK4
B
LK5
A
LK6
B
Table 3. Link Functions
Link No.
Option
LK1
This Link selects the DAC analog voltage source:
• Position A selects the internal voltage source from theADP3331
• Position B selects an external supply voltage(EXT_VDD)
LK2
This Link selects the DAC digital voltage source:
• Position A selects the digital voltage source from SDP board
• Position B selects an external digital supply voltage(EXT_VL)
LK3
This link selects the reference source:
• • Position A selects the on-board 2.5 V reference as the reference source.
• Position B selects the on-board 5 V reference as the reference source.
• Position C selects the internal reference as the reference source.
• Position D selects an off board voltage reference via the EXT_REF connector.
LK4
This link selects the GAIN setting of the AD5689R/87R(not populated):
• Position A selects GAIN=x2.
• Position B selects GAIN=x1.
LK5
This link selects the GAIN setting of the AD5689R/87R:
• Position A selects GAIN=x2.
• Position B selects GAIN=x1.
LK6
This link selects the /SYNC setting:
• • Position B selects the AD5689R.