Datasheet

Evaluation Board User Guide UG-384
Rev. 0 | Page 3 of 12
EVALUATION BOARD HARDWARE
POWER SUPPLIES
The following external supplies must be provided:
+11.4 V to +16.5 V between the V
DD
and AGND inputs for
the positive analog supply of the AD5570.
11.4 V to 16.5 V between the V
SS
and AGND inputs for
the negative analog supply of the AD5570.
The analog and digital planes are connected at one location,
close to the AD5570. To avoid ground loop problems, it is
recommended AGND and DGND not be connected 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
The link options on the evaluation board should be set for the
required operating setup before using the board. The functions
of the link options are described in Table 3.
Default Link Option Setup
The default link options are listed in Table 1.
Table 1. Default Link Options
Link Number Option
LK1 Inserted
LK2 Inserted
LK3 Inserted
ON-BOARD CONNECTORS
There are four connectors on the AD5570 evaluation board
PCB as outlined in Table 2.
Table 2. On-Board Connectors
Connector Function
J1 SDP board connector
J5 Analog power supply connector
VOUT
DAC output connector
VREF External reference voltage input connector
Table 3. Link Options
Link No. Description
LK1
LK1 is used in conjunction with LK2 to select whether the on-board ground force sense buffer is used.
LK2 When LK1 and LK2 are inserted, the ground force sense buffer is not used, the ground pins are connected directly to 0 V, and
the buffer is removed from the ground loop.
When LK1 and LK2 are removed, the ground force sense buffer is used.
LK3 This link is used to select the internal or the external reference.
When LK3 is inserted, the on-board reference is selected as the voltage reference source for the AD5570.
When LK3 is removed, an external voltage reference can be applied to Connector VREF.