Analog Devices AD5420 Evaluation Board EVAL-AD5420EBZ EVAL-AD5420EBZ Hoja De Datos
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EVAL-AD5420EBZ
EVAL-AD5420
Rev. 0 | Page 3 of 12
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
and digital circuitry. Alternatively, place
Link 6 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 AD5420.
• 10.8 V to 16.5 V between the V+ and AGND inputs for the
analog supply of the
(on-board ADC) and
(on-board voltage reference). If the analog supply
connected to the AV
DD
input is less than 16.5 V, the AD7321
and ADR435 can be powered from this by placing Link 9
in Position A, and the V+ input can be left unconnected.
in Position A, and the V+ input can be left unconnected.
The analog and digital planes are connected at one location, close
to the AD5420. It is recommended not to connect AGND and
DGND elsewhere in the system to avoid ground loop problems.
to the AD5420. It is recommended not to connect AGND 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
with a 10 μF and 0.1 μF capacitor pair to the relevant ground plane.
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
Note that, if a power supply in excess of 16.5 V is to be
connected to the AV
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 5).
ADC (see U2 and U6, respectively, in Figure 5).
LINK OPTIONS
The position of Link 7 configures the board for either PC
control via the USB port (default setup) or for control by an
external source via J8. 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 4.
control via the USB port (default setup) or for control by an
external source via J8. 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 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 Not
applicable
LK2 A
LK3 Inserted
LK4 Not
LK3 Inserted
LK4 Not
applicable
LK5 B
LK6 A
LK7 A
LK8 A
LK9 A
LK10 Inserted
LK11 Not
LK6 A
LK7 A
LK8 A
LK9 A
LK10 Inserted
LK11 Not
applicable
LK12 Not
applicable
LK13 Inserted
LK14 Not
LK14 Not
applicable
LK15 C
LK16 Not
LK16 Not
applicable
LK17 Inserted
LK18 Inserted
LK18 Inserted
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
Pin No.
Description
1 SDO
2 Not
2 Not
applicable
3 Digital
ground
4 Clear
5 Digital
5 Digital
ground
6 Fault
7 SDIN
8 Digital
7 SDIN
8 Digital
ground
9 SCLK
10 Latch
10 Latch