TMP32C6411ZLZ datasheet(64/119 Pages) TI

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TMS320C6411

FIXEDPOINT DIGITAL SIGNAL PROCESSOR

SPRS196H − MARCH 2002 − REVISED JULY 2004

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77251−1443

DVDD

CVDD

VSS

C6000

DSP

Schottky

Diode

I/O Supply

Core Supply

GND

Figure 11. Schottky Diode Diagram

Core and I/O supply voltage regulators should be located close to the DSP (or DSP array) to minimize

inductance and resistance in the power delivery path. Additionally, when designing for high-performance

applications utilizing the C6000

 platform of DSPs, the PC board should include separate power planes for

core, I/O, and ground, all bypassed with high-quality low-ESL/ESR capacitors.

power-supply decoupling

In order to properly decouple the supply planes from system noise, place as many capacitors (caps) as possible

close to the DSP. Assuming 0603 caps, the user should be able to fit a total of 60 caps, 30 for the core supply

and 30 for the I/O supply. These caps need to be close to the DSP power pins, no more than 1.25 cm maximum

distance to be effective. Physically smaller caps, such as 0402, are better because of their lower parasitic

inductance. Proper capacitance values are also important. Small bypass caps (near 560 pF) should be closest

to the power pins. Medium bypass caps (220 pF or as large as can be obtained in a small package) should be

next closest. TI recommends no less than 8 small and 8 medium caps per supply (32 total) be placed

immediately next to the BGA vias, using the “interior” BGA space and at least the corners of the “exterior”.

Eight larger caps (4 for each supply) can be placed further away for bulk decoupling. Large bulk caps (on the

order of 100

µF) should be furthest away (but still as close as possible). No less than 4 large caps per supply

(8 total) should be placed outside of the BGA.

Any cap selection needs to be evaluated from a yield/manufacturing point-of-view. As with the selection of any

component, verification of capacitor availability over the product’s production lifetime should be considered.

TMP32C6411ZLZ Datasheet(PDF) 64 Page - Texas Instruments