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Avnet Electronics Marketing
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Rev 1.0 04/17/2006
Released
Literature # ADS-005104
2.16 Power
The Spartan-3 Development Kit includes a 5V AC/DC Adapter that plugs into the board at “J7”.
The Spartan-3 Development board uses a 5V AC/DC adapter (supplied with the kit) with center positive barrel connector. The 5V is
used as the input to a TI PT6944A which provides 3.3VDC and 1.2VDC. Two National Semiconductor LP3966-ADJ parts provide 2.5V
and 1.8V. A separate DDR Termination Regulator (National LP2995) is used to provide 1.25V reference and termination voltages. A
National LM2704 is used to p12V to the OLED display. The barrel connector “J7” is shown below in Figure 18.
IMPORTANT:
Note that there is
no protection for reverse power supply polarity
so take necessary precautions to ensure that the center pin is
4.5V – 5.5V, and the ring is ground!
Figure 18 - Barrel Power Connector "J7"