Evaluation Board Hardware; Power Supplies - Analog Devices EVAL-AD5142DBZ User Manual

Evaluation Board User Guide

EVALUATION BOARD HARDWARE

POWER SUPPLIES

The EVAL-MB-LV-SDZ motherboard supports using single and
dual power supplies.
The EVAL-AD5142DBZ 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
J1-1 VDD
J1-2 AGND
J1-3 VSS
J2-1 VLOGIC
J2-2 DGND
Table 3. Link Functions
Link No. Power Supply
A5 V
LOGIC
A11 V
DD
A12 V
SS
Voltage
Analog positive power supply, V
Single supply from 2.3 V to 5.5 V.
Dual supply from 2.25 V to 2.75 V.
Analog ground.
Analog negative power supply, V
Dual supply from −2.25 V to −2.75 V.
Digital supply, from 1.8 V to V
Digital ground.
Options
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).
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).
This link selects one of the following as the negative power supply:
AGND.
EXTVSS (external supply from the J1 connector).
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 6.
Table 2. Link Options Setup for SDP Control (Default)
Link No.
A5
A11
A12
.
DD
Linear Gain Setting Mode
The linear gain setting mode pin is controlled directly by
Jumper A1. If the jumper is placed in DEPEN, the AD5142
powers up in potentiometer mode, and the linear gain setting
.
SS
mode can be controlled by software. If the jumper is placed in
INDEP, the part powers up in linear gain setting mode, loading
.
DD
independent values for each resistor string—R
and R . The part cannot be placed in potentiometer mode
WB2
again unless the jumper is manually placed in DEPEN.
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UG-471
Option
+3V3
3.3 V
AGND
, R , R ,
AW1 WB1 AW2