SM8703 View Datasheet(PDF) - Nippon Precision Circuits

Part Name

Description

Manufacturer

SM8703

Clock Generator for MPEG2 System

Nippon Precision Circuits  

TYPICAL APPLICATION

SM8703AV

+3.3V

CPU

+3.3V

VDD

MO2

C3

VSS

FSEL/MDT

MO1

SO5

MCK

RSV

MLEN

SO2

VDDA

VDD1

C4

C5

VSSA

VSS1

XTI

C1 X'tal

XTO

C2

RSV

RSV

SO3

SO4

RSV

VDD2

C6

SO1

VSS2

SM8703AV

27MHz

27MHz

768fs

384fs

512fs

512fs

33.8688MHz

s Connect the decoupling capacitors (approximately

0.1µF and 1000pF) in parallel, as close to power

supply pins as possible.

s In order to minimize noise, it is useful to make

VSS as solid pattern.

s Master clock stability affects the other outputs sta-

bility. In the usage of crystal oscillator, load

capacitor and crystal oscillator should be placed as

close to the SM8703AV as possible, and wired

shortly. Select crystal oscillators and load capaci-

tance carefully, depending on the condition, as

those combination will have influence on the fre-

quency accuracy(C1, C2).

s Supply pattern including decoupling capacitors

needs careful attention to make the IC’s perfor-

mance better, since the SM8703AV outputs sev-

eral high frequency clocks. Pattern capacitance

from output pins should not to be large for preven-

tion of the noise. Connecting output pins to buff-

ers is useful if it is necessary.

s Power supply and VSS pins.

• VDD : Power supply for digital block

(CPU I/F*, MO1, MO2)

• VSS : VSS for digital block

(CPU I/F*, MO1, MO2)

• VDDA : Power supply for PLL block

(XTI, XTO, PLL/VCO)

• VSSA : VSS for PLL block

(XTI, XTO, PLL/VCO)

• VDD1 : Power supply for output block

(except SO1)

• VSS1 : VSS for output block

(except SO1)

• VDD2 : Power supply for SO1

• VSS2 : VSS for SO1

*: CPU I/F: FSEL/MDT, MLEN, MCK

NIPPON PRECISION CIRCUITS—11

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