SM8721AB Datasheet, PDF (1/8 Pages) Nippon Precision Circuits Inc – 3-PLL Multi-Output Clock Generator

SM8721AB
3-PLL Multi-Output Clock Generator
OVERVIEW
The SM8721AB is a clock generator IC with 3 built-in PLLs. It can simultaneously generate and output 3
clocks with different frequency derived from a single master clock. The generated output clock frequency can
be switched using control pins and one clock can be turned ON/OFF (CLK2). The master clock can be selected
from a low-cost 14.31818MHz or small 28.636363MHz crystal. The device is available in compact 20-pin
QFN packages, making it ideal for portable digital still cameras and other applications which require multiple
clocks.
FEATURES
I 3.0 to 3.6V supply voltage
I Crystal oscillator circuit built-in
I 14.318182/28.636363MHz master clock
(internal PLL reference clock)
I Generated clocks
• 14.318182/17.734450MHz (REF_CLK)
• 71.877274/90.314686/96.016044
/114.54546MHz (CLK1)
• 48.008022/96.016044MHz (CLK2)
I Low jitter output
• 30ps typ. (1-sigma)
• 180ps typ. (peak-to-peak)
I Output load
• 15pF
I 20-pin QFN package (Pb free)
PINOUT
(Top view)
15 14 13 12 11
CLK2 16
VSS2 17
VDD2 18
REF_CLK 19
TEST2 20
10 FS1
9 FS2
8 FS3
7 XTAL_SEL
6 TEST1
1 23 4 5
APPLICATIONS
I Digital still cameras
ORDERING INFORMATION
Device
SM8721AB
Package
20-pin QFN
PACKAGE DIMENSIONS
(Unit: mm)
Weight: 0.037g
4.20 ± 0.20
4.00 ± 0.10
15
11
16
10
20
1
0.50
6
5
0.60 ± 0.10
0.22 ± 0.05
0.05
0.05 M
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