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Concerns on DDR2 VREF divider circuit

The OMAP-L138 data sheet recommends generating the DDR2 VREF (.9V nominal) by a resistive diveder from the 1.8V DDR2 supply. It specifies a capacitor filter array on this divider. 

Is there a justification for low-pass filtering the VREF? Wouldn't this defeat the purpose of having a VREF that tracks the power supply?


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