SM8703AV datasheet(11/12 Pages) NPC

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SM8703AV

NIPPON PRECISION CIRCUITS—11

TYPICAL APPLICATION

Connect the decoupling capacitors (approximately

0.1

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

supply pins as possible.

In order to minimize noise, it is useful to make

VSS as solid pattern.

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).

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.

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

SO2

VSS

VDD

MO1

RSV

SO3

MLEN

FSEL/MDT

RSV

XTO

SO4

MCK

RSV

VDDA

MO2

VSSA

XTI

VDD1

VSS1

SO5

SM8703AV

CPU

768fs

384fs

33.8688MHz

27MHz

X'tal

+3.3V

VDD2

RSV

VSS2

SO1

+3.3V

27MHz

512fs

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