Power supplies – Digilent 410-178P-KIT User Manual
Page 9
Atlys Reference Manual
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Power Supplies
The Atlys board requires an external 5V, 4A or greater power source with a coax center-positive
2.1mm internal-diameter plug (a suitable supply is provided as a part of the Atlys kit). Voltage
regulator circuits from Linear Technology create the required 3.3V, 2.5V, 1.8V, 1.0V, and 0.9V
supplies from the main 5V supply. The table below provides additional information (typical currents
depend strongly on FGPA configuration, and the values provided are typical of medium-size/speed
designs).
The four main voltage rails on the Atlys board use Linear Technology LTC2481 Delta-Sigma 16-bit
ADC's to continuously measure supply current. Accurate to within 1%, these measured values can be
viewed on a PC using the power meter that is a part of the Adept software.
Atlys Power Supplies
Supply
Circuits
Device
Amps (max/typ)
3.3V
FPGA I/O, video, USB ports, clocks, ROM, audio
IC16: LT3501
3A / 900mA
2.5V
FPGA aux, VHDC, Ethernet PHY I/O, GPIO
IC15: LTC3546 1A / 400mA
1.2V
FPGA core, Ethernet PHY core
IC15: LTC3546 3A / 0.8
– 1.8A
1.8V
DDR & FPGA DDR I/O
IC16: LT3501
3A / 0.5 -- 1.2A
0.9V
DDR termination voltage (V
TT
)
IC14: LTC3413 3A / 900mA