Analog Devices AD5422LF Evaluation Board EVAL-AD5422LFEBZ EVAL-AD5422LFEBZ Ficha De Dados
Códigos do produto
EVAL-AD5422LFEBZ
Evaluation Board User Guide
UG-442
Rev. C | Page 3 of 16
EVALUATION BOARD HARDWARE
POWER SUPPLIES
The following external supplies must be provided:
• 5 V between the 5 V and 0 V inputs for the digital supply
• 5 V between the 5 V and 0 V inputs for the digital supply
and digital circuitry. Alternatively, place
LK6 in Position A to power the digital circuitry from the
USB port (default).
USB port (default).
• 10.8 V to 40 V between the AV
DD
and GND inputs for the
analog supply of the
• 0 V to −26.4 V between the AV
SS
and GND inputs for the
negative analog supply of the
. (This is only required
if a bipolar output voltage range is programmed; otherwise,
the negative supply of the
the negative supply of the
GND by placing LK4 in Position A.)
• 10.8 V to 16.5 V between the V+ and GND inputs for the
analog supply of the
(on-board analog-to-digital
converter [ADC]) and
(on-board voltage reference).
If the analog supply connected to the AV
DD
input is less than
16.5 V, the
by placing LK9 in Position A, and the V+ input can be left
unconnected.
unconnected.
• 0 V to −16.5 V between the V− and GND inputs for the
negative analog supply of the
(on-board ADC). If
the negative analog supply connected to the AV
SS
input is
less than (magnitude) −16.5 V, the
can be powered
from this by placing LK16 in Position A, and the V− input
can be left unconnected.
can be left unconnected.
. It is recommended not to connect GND and
DGND elsewhere in the system to avoid ground loop problems.
Each supply is decoupled to the relevant ground plane with 10 µF
and 0.1 µF capacitors. Each device supply pin is again decoupled
Each supply is decoupled to the relevant ground plane with 10 µF
and 0.1 µF capacitors. Each device supply pin is again decoupled
with a 10 µF and 0.1 µF capacitor pair to the relevant ground plane.
Excessive Power Supply
If a power supply in excess of 16.5 V is connected to the AV
DD
input, LK9 must be in Position B to prevent potential damage to the
5 V voltage reference and to the ADC (see U2 and U6, respectively,
in Figure 6). However, if a power supply in excess of −16.5 V is to
be connected to the AV
5 V voltage reference and to the ADC (see U2 and U6, respectively,
in Figure 6). However, if a power supply in excess of −16.5 V is to
be connected to the AV
SS
input, LK16 must be in Position B to
prevent potential damage to the ADC.
LINK OPTIONS
The position of LK7 configures the board for either PC control via
the USB port (default setup) or for control by an external source
via J8. Set the link options on the evaluation board for the required
operating setup before using the board. The functions of the link
options are described in Table 4.
the USB port (default setup) or for control by an external source
via J8. Set the link options on the evaluation board for the required
operating setup before using the board. The functions of the link
options are described in Table 4.
Default Link Option Setup
The default setup is for control by the PC via the USB port. The
default link options are listed in Table 1.
default link options are listed in Table 1.
Table 1. Link and Switch Options for PC Control
Link No.
Option
LK1
A
LK2
A
LK3
Inserted
LK4
B
LK5
B
LK6
A
LK7
A
LK8
A
LK9
A
LK10
Inserted
LK11
Inserted
LK12
Inserted
LK13
Inserted
LK14
Inserted
LK15
C
LK16
A
LK17
Inserted
LK18
Inserted
Connector J8 Pin Descriptions
Table 2. Connector J8 Pin Configuration
2
4
6
8
10
1
3
5
7
9
1
LK7 must be in Position B to enable the use of J8.
Table 3. Connector J8 Pin Descriptions
Connector J8 Pin No.
Function
1
SDO
2
CLEAR SELECT
3
DGND
4
CLEAR
5
DGND
6
FAULT
7
SDIN
8
DGND
9
SCLK
10
LATCH