Analog Devices EVAL-AD5141DBZ, User Manual

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Evaluation Board User Guide UG-473
Rev. 0 | Page 3 of 20
EVALUATION BOARD HARDWARE
POWER SUPPLIES
The EVAL-MB-LV-SDZ motherboard supports using single and
dual power supplies.
The
EVAL-AD5141DBZ evaluation board can be powered either
from the SDP port or externally by the J1 and J2 connectors, as
described in Table 1.
All supplies are decoupled to ground using 10 µF tantalum and
0.1 µF ceramic capacitors.
Table 1. Maximum and Minimum Voltages of the Connectors
Connector No. Label Voltage
J1-1 VDD Analog positive power supply, V
DD
.
Single supply from 2.3 V to 5.5 V.
Dual supply from 2.25 V to 2.75 V.
J1-2 AGND Analog ground.
J1-3 VSS Analog negative power supply, V
SS
.
Dual supply from −2.25 V to −2.75 V.
J2-1 VLOGIC Digital supply, from 1.8 V to V
DD
.
J2-2 DGND Digital ground.
Link Options
Several link and switch options are incorporated in the EVAL-
MB-LV-SDZ motherboard and should be set up before using
the board. Table 2 describes the positions of the links to control
the evaluation board via the SDP board using a PC. The
functions of these link options are described in detail in Table 3
through Table 11.
Table 2. Link Options Setup for SDP Control (Default)
Link No . Option
A5 +3V3
A11 3.3 V
A12 AGND
Linear Gain Setting Mode
The linear gain setting mode pin can be controlled directly by
Jumper A5. If the jumper is placed in Position A, the AD5141
powers up in potentiometer mode, and the linear gain setting
mode can be controlled by software. If the jumper is placed in
Position B, the part powers up in linear gain setting mode,
loading independent values for each resistor string—R
AW
and
R
WB
,. The jumper cannot be placed in potentiometer mode
again unless the jumper is manually placed in Position A.
Table 3. Link Functions
Link No. Power Supply Options
A5 V
LOGIC
This link selects one of the following as the digital supply:
+3V3 (3.3 V from SDP).
VLOGIC EXT (external supply from the J2 connector).
A11 V
DD
This link selects one of the following as the positive power supply:
+5 V (5 V from SDP).
3V3 (3.3 V from SDP).
VDD (external supply from the J1 connector).
A12 V
SS
This link selects one of the following as the negative power supply:
AGND.
EXTVSS (external supply from the J1 connector).