TMPR4956C datasheet(283/286 Pages) TOSHIBA

Part #	TMPR4956C

Description	64-Bit TX System RISC TX49 Family

PDF	286 Pages

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Manufacturer	TOSHIBA [Toshiba Semiconductor]

Direct Link	http://www.semicon.toshiba.co.jp/eng

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Appendix A PLL Passive Components

A-1

Appendix A. PLL Passive Components

The Phase Locked Loop circuit requires several passive components for proper operation, which are connected

to VccPLL, and VssPLL, as illustrated in Figure A.1.

Figure A.1 PLL Recommended Circuit

Values:

•

R = 5.6

Ω (Note 1)

•

L = 2.2

µH

•

C1 = 1 nF

(Note 1)

•

C2 = 82 nF

(Note 1)

•

C3 = 10

µF (Note 1)

•

VccInt = 1.25 V

± 5%

The inductors (L) can be used as alternatives to the resistors (R) to filter the power supply.

It is essential to isolate the analog power and ground for the PLL circuit (VccPLL/VssPLL) from the regular

power and ground (VccInt/Vss).

Note 1: These value should be changed to suitable value for each board.

TX4956

VccInt

VccPLL

VssPLL

VSS

C1, C2, C3, R and L are Board

Components which should be placed

as close as possible to the processor.

TMPR4956C Datasheet(PDF) 283 Page - Toshiba Semiconductor