DM385 datasheet(135/281 Pages) TI

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CVDD_x

CVDD

3.3 V Supplies

V Delta

(A)

1.8 V Supplies

(Excluding DVDD_DDR[x])

1.35 V/1.5 V/1.8 V DVDD_DDR[0]

CVDD, CVDD_x

3.3 V Supplies

(DVDD, DVDD_x, DVDD_C, VDDA_x_3P3)

1.8 V Supplies

(DVDD, DVDD_x, VDDA_x_1P8,

VDDA_1P8)

DM385, DM388

www.ti.com

SPRS821D – MARCH 2013 – REVISED DECEMBER 2013

Figure 7-2. Power-Down Sequence

V Delta Max = 2 V.

Figure 7-3. 3.3 V Supplies Falling After 1.8 V Supplies Delta

Figure 7-4. CVDD and CVDD_x Power-Down Sequence

7.2.9

Power-Supply Decoupling

7.2.9.1

Analog and PLL

PLL and Analog supplies benefit from filters or ferrite beads to keep the noise from causing problems. The

minimum recommendation is a ferrite bead along with at least one capacitor on the device side of the

bead. An additional recommendation is to add one capacitor just before the bead to form a Pi filter. The

filter needs to be as close as possible to the device pin, with the device side capacitor being the most

important component to be close to the device pin. PLL pins close together can be combined on the same

supply, but analog pins should all have their own filters. PLL pins farther away from each other may need

their own filtered supply.

Power, Reset, Clocking, and Interrupts

135

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DM385 Datasheet(PDF) 135 Page - Texas Instruments