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PDF SM8721AB Data sheet ( Hoja de datos )
| Número de pieza | SM8721AB | |
| Descripción | 3-PLL Multi-Output Clock Generator | |
| Fabricantes | NPC | |
| Logotipo |  |
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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
VSS2
VDD2
REF_CLK
TEST2
16
17
18
19
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
SEIKO NPC CORPORATION —1
1 page  
www.DataSheet4U.com
SM8721AB
AC Characteristics
VDD = (VDD1, VDD2, VDD3) = 3.3 ± 0.3V, VSS = (VSS1, VSS2, VSS3) = 0V, Ta = −40 to +85°C unless otherwise
noted.
Parameter
Symbol
Pins
Conditions
Rating
min typ max
Output clock rise time*1
tr
CLK1, CLK2, CL = 15pF, VOL = 0.2VDD to
REF_CLK VOH = 0.8VDD transition
–
2.0
–
Output clock fall time*1
tf
CLK1, CLK2, CL = 15pF, VOH = 0.8VDD to
REF_CLK VOL = 0.2VDD transition
–
2.0
–
Output clock jitter*2,*3
tjitter
(1-sigma)
tjitter
(peak-peak)
CLK1, CLK2,
REF_CLK
CLK1, CLK2,
REF_CLK
Ta = 25°C, CL = 15pF,
VO = 0.5VDD
Ta = 25°C, CL = 15pF,
VO = 0.5VDD
– 30 –
– 180 –
Output clock duty cycle*1, *3
Dt1
CLK1, CLK2, Ta = 25°C, CL = 15pF,
REF_CLK VO = 0.5VDD
45 50 55
Dt2
CLK1
Ta = 25°C, CL = 15pF,
VO = 0.5VDD, 114.54546MHz
40
50
60
Power-up time*3,*4,*5
tP
CLK1, CLK2,
REF_CLK
–15
*1. Measured using the circuit shown in figure 1 on the NPC standard evaluation board.
*2. Measured using the circuit shown in figure 2 on the NPC standard evaluation board.
*3. The crystal oscillator element coefficients for characteristics measurements are described below (HP4195 measurement equipment).
f = 14.318182MHz crystal: R = 12.16Ω, L = 10.34mH, Ca = 11.95fF, Cb = 4.03pF
f = 28.636363MHz crystal: R = 12.50Ω, L = 5.89mH, Ca = 5.25fF, Cb = 1.65pF
Unit
ns
ns
ps
ps
%
%
ms
Cb
L Ca R
*4. The power-up time is the time from when the supply reaches 3.0V after the supply is turned ON until each output clock reaches its designated
frequency to within ±0.1%.
*5. Measured using the NPC standard evaluation board.
14.318182/
28.636363MHz
DUT
Active Probe
(HP1152A)
DUT:Device under test
Passive Probe
(HP10435A)
Oscilloscope
(Infinium
HP54845A)
Frequency &
Time Interval
Analyzer
(HP5371A)
Figure 1. Measurement circuit 1
14.318182/
28.636363MHz
DUT
Active Probe
(HP1152A)
DUT:Device under test
Oscilloscope
(Infinium
HP54845A)
Jitter
Measurement
System
(ASA, M1)
Figure 2. Measurement circuit 2
SEIKO NPC CORPORATION —5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet SM8721AB.PDF ] | |
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