SM8703AV
NIPPON PRECISION CIRCUITS INC.
Clock Generator for MPEG2 System
OVERVIEW
The SM8703AV is a 27 MHz master clock, 5-system output clock generator for MPEG2 system. It has 2 built-
in PLLs that, with the addition of a single crystal oscillator element, can generate 384fs, 512fs and 768fs
clocks which are necessary for MPEG2 system, plus independent fixed-frequency 27 MHz and 33.8688 MHz
output clocks. Each output can stop unused output by using disable function, therefore, unnecessary radiation
can be suppressed. Also, visual and audio synchronous is not disrupted since each output frequency is kept in
the normal ratio. Supported sampling frequencies (fs) include 44.1 or 48 kHz.
FEATURES
s
PINOUT
(Top View)
s
s
s
s
s
s
27 MHz master clock (internal PLL reference
clock)
Generated clocks
• 27 MHz output
• 33.8688 MHz output
• 384fs output
• 512fs output
• 768fs output
Sampling frequency fs
• 44.1/48 kHz
Output disable function
Low jitter output: 100 ps (typ, 15pF load)
Supply voltage: 3.3 V
24-pin VSOP package
VDD
VSS
MO1
MCK
MLEN
VDDA
VSSA
XTI
XTO
RSV
RSV
SO1
1
24
12
13
MO2
FSEL/MDT
SO5
RSV
SO2
VDD1
VSS1
RSV
SO3
SO4
VDD2
VSS2
SM8703AV
APPLICATIONS
s
s
s
DVD players
Set top box
MPEG2 system
PACKAGE DIMENSIONS
(Unit: mm)
7.8
±
0.1
ORDERING INFORMATION
D e vice
S M 8 7 0 3 AV
P ackag e
24-pin V S O P
+
0.05
0.15
−
0.02
5.6
±
0.1
7.6
±
0.2
+
0.2
1.25
−
0.1
0 to 10
0.65
+
0.1
0.22
−
0.05
0.1
0.13
M
NIPPON PRECISION CIRCUITS—1
0.1
±
0.1
0.5
±
0.2
SM8703AV
BLOCK DIAGRAM
FSEL/MDT
MCK
MLEN
External
Interface
Phase
Comparator0
Divider0
XTI
Oscillator
XTO
Charge
Pump0
SO5
LPF0
VCO0
SO4
Divider0
Divider
SO3
SO2
Divider1
Phase
Comparator1
Charge
Pump1
LPF1
VCO1
SO1
Divider1
MO1
MO2
NIPPON PRECISION CIRCUITS—2
SM8703AV
PIN DESCRIPTION
Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Name
VDD
VSS
MO1
MCK
MLEN
VDDA
VSSA
XTI
X TO
RSV
RSV
SO1
VSS2
VDD2
SO4
SO3
RSV
VSS1
VDD1
SO2
RSV
SO5
FSEL/MDT
MO2
I/O
–
–
O
Ip
1
Ip
1
–
–
I
O
–
–
O
–
–
O
O
–
–
–
O
–
O
Ip
1
O
Pow er supply for Digital block
VSS for Digital block
27 MHz fixed-frequency output 1
Serial interface bit clock input
Serial interface latch enable input
Pow er supply for Analog block
VSS for Analog block
Reference signal crystal oscillator element connection or external clock input
Reference signal crystal oscillator element connection
Reser ved (must be open)
Reser ved (must be open)
33.8688 MHz fixed-frequency output
VSS for Output buffer
Pow er supply for Output buffer
512fs output
512fs output
Reser ved (must be open)
VSS for Output buffer
Pow er supply for Output buffer
384fs output
Reser ved (must be open)
768fs output
P arallel mode: Sampling frequency select signal input
Serial mode: Control data input
27 MHz fixed-frequency output 2
Description
1. Schmitt trigger input with internal pull-up resistor
NIPPON PRECISION CIRCUITS—3
SM8703AV
SPECIFICATIONS
Absolute Maximum Ratings
P arameter
Supply voltage range
Symbol
V
D DA
, V
DD
,
V
DD1
, V
DD2
V
DDA
– V
DD
,
V
DDA
– V
DD1
,
V
DDA
– V
DD2
,
V
DD
– V
DD1
,
V
DD
– V
DD2
,
V
DD1
– V
DD2
V
SSA
– V
SS
,
V
SSA
– V
SS1
,
V
SSA
– V
SS2
,
V
SS
– V
SS1
,
V
SS
– V
SS2
,
V
SS1
– V
SS2
V
IN
V
OUT
P
D
T
stg
Digital inputs
Digital outputs
Condition
Rating
−
0.3 to 6.5
Unit
V
Supply voltage deviation
±0.1
V
Ground voltage deviation
±0.1
V
Input voltage range
Output voltage range
Pow er dissipation
Storage temperature range
−
0.3 to V
D D
+
0.3
−
0.3 to V
D D
+
0.3
300
−
55 to 125
V
V
mW
°
C
Recommended Operating Conditions
P arameter
Supply voltage ranges
Operating temperature range
Symbol
V
D DA
, V
DD
,
V
DD1
, V
DD2
T
opr
Condition
Rating
3.0 to 3.6
–40 to 85
Unit
V
°
C
NIPPON PRECISION CIRCUITS—4
SM8703AV
DC Electrical Characteristics
External clock, T
a
= –40 to 85
°
C, V
DDA
= V
DD
= V
DD1
= V
DD2
= 3.0 to 3.6 V unless otherwise stated
Rating
P arameter
Symbol
Condition
min
All supplies.
V
D D A
= V
D D
= V
D D 1
= V
D D 2
= 3.3V,
T
a
= 25
°
C , fs = 48 kHz,
Cr ystal oscillator element,
no load on all outputs
XTI, FSEL/MDT, MCK, MLEN
XTI, FSEL/MDT, MCK, MLEN
F S E L / M D T, MCK, MLEN, V
IN
= V
D D
F S E L / M D T, MCK, MLEN, V
IN
= 0 V
XTI, V
IN
= V
D D
XTI, V
IN
= 0 V
All outputs. I
O H
=
−
2 m A
All outputs. I
O L
= 4 mA
typ
max
Unit
Current consumption
I
D D
–
32
45
mA
HIGH-level input voltage
L O W -level input voltage
HIGH-level input current
L O W -level input current
HIGH-level input current
L O W -level input current
HIGH-level output voltage
L O W -level output voltage
V
IH
V
IL
I
IH1
I
IL1
I
IH2
I
IL2
V
OH
V
OL
0.8 V
D D
–
–
–
–
–
V
D D
−
0.4
–
–
–
–
–
–
–
–
–
–
0.2 V
D D
1
−
100
40
−
40
–
0.4
V
V
µA
µA
µA
µA
V
V
AC Electrical Characteristics
External clock, T
a
= –40 to 85
°
C, V
DDA
= V
DD
= V
DD1
= V
DD2
= 3.0 to 3.6 V unless otherwise stated
Rating
P arameter
XTI external input clock frequency
Output clock rise time
Output clock fall time
Symbol
f
M
t
R
t
F
All outputs, 0.2 to 0.8V
D D
,
C
L
= 15 p F
All outputs, 0.8 to 0.2V
D D
,
C
L
= 15 p F
All outputs, Standard tolerance,
Cr ystal oscillator element,
C
L
= 15 p F
All outputs, Crystal oscillator
element, 1.4V to 1.4V, C
L
= 15 p F
All outputs
All outputs
Condition
min
–
–
–
typ
27.0000
2.0
2.0
max
–
–
–
MHz
ns
ns
Unit
Output clock jitter
1
JITTER
–
100
–
ps
Output clock duty
1
Settling time
Pow er-up time
2
DUTY
t
S
t
P
45
–
–
50
–
15
55
100
30
%
ns
ms
1. 1.4V to 1.4V. Ta = 2 0
°
C . The characteristics of output clock jitter and output clock duty depends on crystal oscillator.
N P C ’s standard crystal oscillator: R = 10.5
Ω
, L = 5.38 mH, Ca = 6.74 fF, Cb = 1.85 p F
measurement apparatus: HP4195
Load capacitance: C1 = 7 p F, C2 = 11 p F
Cb
L
Ca
R
2. Time from OFF condition to stable frequency output.
NIPPON PRECISION CIRCUITS—5
微控制器 MCU
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