Texas Instruments ADS1224EVM, User Manual

Page: 20 / 34

J3: Power Connector
2-6
2.1.3 J3: Power Connector
The power connector pinout diagram is shown in Figure 2−4 and described in
Table 2−3.
Figure 2−4.
Power Connector Pinout
1 3 5 7 9
2 4 6 8 10
DGND
AGND
+1.8VD
+3.3VD
+5VA
+5VD
Table 2−3. Power Connector Pin Descriptions
Pin Number Pin Name Function Use on ADS1224EVM
1 +VA Positive Analog Supply, +5V to
+18V Not used
2 −VA Negative Analog Supply, −5V to
−18V Not used
3 +5VA Positive Analog Supply, +5V Analog supply
4 −5VA Negative Analog Supply, −5V Not used
5 AGND Analog Ground Optional connection to DGND
using J4
6 DGND Digital Ground Ground
7 +1.8VD Positive Digital Supply, +1.8V Digital supply, selected using J4
8 VD1 Positive Digital Supply Not used
9 +3.3VD Positive Digital Supply, +3.3V Digital supply, selected using J4
10 +5VD Positive Digital Supply, +5V Digital supply, selected using J4
Note: The ADS1224EVM has a single ground domain. The ground is always connected to DGND. It
may also be connected to AGND using J4 pins 11−12.
The ADS1224 uses an analog supply of +5V and a digital supply of +1.8V to
+5.5V. +1.8V, +3.3V and +5V are all available as standard supply voltages
over the power connector; the ADS1224EVM allows the user to select one of
them using J4.