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Altera_Forum
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15 years ago

power supply requirement for cyclone II

we are in design process for our new design using cyclone II series FPGA, We have a doubt regarding a power supply requirements. In EP2C5 datasheet it is given that 1.2V as AVDD(analog ...
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Altera_Forum
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15 years ago

You should implement the suggested passive filtering for PLL supply VCCA. Some development kits actually use a separate voltage regulator for VCCA, but I never used it. You should consider however, that besides high frequency interferences also mid frequency ripple of the PLL supply can cause excessive jitter and even loss of lock.