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CM312102SB Datasheet(PDF) 9 Page - California Micro Devices Corp |
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CM312102SB Datasheet(HTML) 9 Page - California Micro Devices Corp |
9 / 11 page © 2004 California Micro Devices Corp. All rights reserved. 11/12/04 430 N. McCarthy Blvd., Milpitas, CA 95035-5112 ● Tel: 408.263.3214 ● Fax: 408.263.7846 ● www.calmicro.com 9 CM3121 PRELIMINARY Application Information Other Applications The CM3121 can be used without any external resis- tors if a VDDQ voltage of 2.5V is required by connecting the SENSE_VDDQ pin to GND. Also in applications where a reference voltage (VREF) is required, a PCB trace directly from the VTT pin can be used. The VTT output pin has an error relative to VDDQ/2 of up to +/-25mV, which is well within most DDR system specs of +/-50mV. This is because the VTT output internally tracks the VDDQ output very closely due to the matched on-chip resistors R that tap down from the VDDQ rail, and the low offset voltage of the VTT regulator. It is recommended that the VREF trace be connected directly to the VTT pin, to eliminate noise and ripple on the VTT line caused by current switching . Figure 4. Typical Application for the CM3121 VREF=1.25V VREF R R FAULT VTT=1.25V VDDQ REGULATOR VTT REGULATOR EN_DDR VCC GND CDDQ DDR MEMORY CPU CORE + I/O CCC CTT Enable DDR Memory # 2.8V to 3.6V SENSE VTT VTT SENSE VTT VDDQ SENSE VDDQ CURRENT LIMIT OVERTEMP LOW INPUT |
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