Texas Instruments ADS1281EVM, User Manual, Page: 12 / 37

J13
POWER
SUPPLY
CONFIG
J14
POWER
INPUT
J12
WALL SUPPLY DISCONNECT
GND
+5VDC
(OPTIONAL) 5VDC
-
+10V
-
10V
ADS1281EVM-PDK Kit Operation
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9.3.2 Using a External Supply For +5V
A laboratory power supply can be connected through terminal block J14 on the MMB0, as shown in
Figure 8 , to provide the +5V required for operation.
To use a lab power supply for +5V:
• Disconnect J12 on the MMB0. This disconnect the barrel jack, J2, from powering the +5V supply.
• Connect a +5V dc supply to the +5VA and GND terminals on J14.
• Make sure that the external supply can source 2A of current to the board.
Figure 8. Using a External Supply For +5V
9.3.3 Connecting the External Bipolar Supplies
A external supply of ± 10V is required for proper operation of the EVM. These supplies can be connected
to the terminal block J14 on the MMB0.
Connect the – 10V dc supply to – VA, and +10V dc to +VA terminals on J14.
9.3.4 Power For Bipolar Mode versus Unipolar Mode
The ADS1252EVM allows for operation of the device in either unipolar or bipolar mode. Depending on the
mode, the power supply requirements can differ.
For operation in unipolar mode, no additional supplies are required other than those specified in
Section 9.3.1 to Section 9.3.3 .
For operation in bipolar mode, an additional -5V supply is required. Connect at – 5V supply to – 5VA
terminal of J14. It is not necessary to connect a +5V dc supply voltage to the +5VA terminal on J14 if the
+5V/+5VA position on J13 is shorted.
12 ADS1281EVM and ADS1281EVM-PDK User ' s Guide SBAU143C – March 2009 – Revised May 2011
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