Datasheet
EVAL-AD5292EBZ
Rev. 0 | Page 3 of 12
EVALUATION BOARD HARDWARE
POWER SUPPLIES
The EVAL-AD5292EBZ needs one digital supply and up to two
analog supplies to operate. The digital supply is provided on the
board, or it is possible to use an external supply by placing Link 8
in Position B and connecting a power supply in J4 (see Table 3).
The analog supplies must be provided by the user through
connectors J1, J2 and J3, which are V
DD
, GND, and V
SS
, respec-
tively, as shown in Table 1.
All supplies are decoupled to ground with 10 μF tantalum and
0.1 μF ceramic capacitors.
Table 1. Maximum and Minimum Voltages Connectors
Connector No. Voltage
J1 Analog positive power supply, V
DD
, as follows:
21 V to 30 V single-supply operation
10.5 V to15 V dual-supply operation
J2 Analog GND
J3 Analog negative power supply, V
SS
, as follows:
0 V single-supply operation
−10.5 V to −15 V dual-supply operation
J4 Digital power supply from 2.7 V to 5 V
LINK OPTIONS
A number of link and switch options are incorporated into the
evaluation board and should be set to 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 links to control the evaluation board by the PC
via the USB port using the AD5292 in single-supply mode with
the wiper buffer connected.
Table 2. Link Options Setup for PC Control (Default)
Link No. Options
LK2 Inserted
LK4 Inserted
LK5 Inserted
LK6 Inserted
LK7 Inserted
LK8 A
LK9 B
Table 3. Link Functions
Link No. Option
LK1 Connects Terminal A of the digipot to V
DD
.
LK2 Connects Terminal W of the digipot to the buffer.
LK3 Connects Terminal B of the digipot as follows:
LK3 A—V
SS
LK3 B—GND
LK4
1
Connects the negative power supply of the buffer to GND.
LK5 Connects the positive power supply of the buffer to V
DD
.
LK6
Allows feedback in the buffer.
LK7
1
Connects the negative power supply of the buffer to V
SS
.
LK8 Selects the digital power supply as follows:
LK8 A—5 V (from USB)
LK8 B—3.3 V (from ADP3303)
LK8 C—external supply from J4 connector
LK9
Selects whether the AD5292 evaluation board is controlled by the PC via the USB port or by an external source via the
SMB connectors, as follows:
LK9 A—SMB connectors
LK 9 B—USB port
1
In single supply-power operation, it is recommended to connect LK4 and LK7.