Document
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 builtin 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.