
2–66 Reference Manual Altera Corporation
Cyclone II DSP Development Board August 2006
Power Supply
On-Board Power Regulators (U2, U7, U8, U9, U10, U23 & U24)
There are seven voltage regulators on the Cyclone II DSP development
board to control eight separate voltage rails. Two switching regulators
provide 3.3 V, 1.8 V, and 6 V. Five linear regulators provide 5 V, 1.2 V,
0.9 V, VCCA_DAC, and VCCA_ADC. Table 2–35 describes each voltage
regulator. See Figure 2–24 for the locations of the voltage regulators on
the Cyclone II DSP development board.
Table 2–35. Cyclone II DSP Development Board Regulators
Board
Reference
Type
Voltage
Output
Provides Power To Manufacturer Part Number
U2
Dual
output
switching
regulator
3.3 V
● Cyclone II VCCIO banks 1, 2, 5, and 6
● Clock oscillators and buffers
● Expansion Prototype Connector
● SSRAM
● EPCS64
● LEDs and seven-segment displays
● DIP switches and push-buttons
● Audio CODEC
● Video DAC
Texas
Instruments
TPS51020
1.8 V
● DDR2 SDRAM DIMM
● Cyclone II VCCIO banks 3, 4, 7, and 8
TPS51020
U7
Linear
regulator
1.2 V ● Cyclone II VCCINT
● VCCA_PLL
● VCCD_PLL
UC382TD
U8
Linear
regulator
0.9 V ● DDR2 SDRAM VTT TPS51100
U9
Switching
regulator
6V ● VCCA_ADC regulator
● VCCA_DAC regulator
TPS40055
U10
Linear
regulator
5V ● Linear 0.9V regulator
● Expansion Prototype Connector card
voltage limiters
REG104GA
U23
Linear
regulator
3.3 V
5V
● D/A Converter voltage REG104GA
U24
Linear
regulator
3.3 V ● A/D Converter voltage REG104GA
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