SM8701BM Datasheet, PDF (13/14 Pages) Nippon Precision Circuits Inc – DVD Player Clock Generator

TYPICAL APPLICATION
SM8701BM
+3.3V +5V
CPU
MLEN/R2 MCK/R1
P/S
MDT/R0
VDD
C3
GND
RSTN
SO3
XTO
C1 _X'tal
XTI
C2
VDDO
C6
GNDO
GNDP
SO2
C4
VDDP
SO4
VDD3
SO1
C5
MO
MON
SM8701BM
384fs
256fs
768fs
33.8688MHz
27MHz(Inverted)
27MHz
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
ground 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 SM8701BM 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 SM8701BM 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 ground pins.
• VDD :5V Power supply for digital block
(CPU I/F*, XT1, XT2).
• GND : Ground for digital block
(CPU I/F*, XT1, XT2, output
block except SO3).
• VDDP :5V Power supply for PLL block.
• GNDP : Ground for PLL block.
• VDDO :3.3V Power supply for SO3.
• GNDO : Ground for SO3.
• VDD3 :3.3V Power supply for output block
(except SO3).
*: CPU I/F: MDT/R0, MCK/R1, MLEN/R2, RSTN,
P/S
NIPPON PRECISION CIRCUITS—13