SM8720AV Datasheet, PDF (1/6 Pages) Nippon Precision Circuits Inc – 3-PLL Multi-Output Clock Generator

SM8720AV
3-PLL Multi-Output Clock Generator
OVERVIEW
The SM8720AV is a clock generator IC with 3 built-in PLLs. It can simultaneously output a 27MHz master
clock and three other clocks with different frequency (CLK1OUT, CLK2OUT, CLK3OUT) derived from the
master clock. The 3 generated clocks can be independently turned ON/OFF using control pins and the fre-
quency of CLK3OUT can be switched, allowing unneeded clocks within a system to be switched OFF thereby
reducing current consumption. The master clock, supplied by high-stability crystal oscillator external input,
allows clocks to be generated with high precision and low jitter and which require no frequency adjustment,
making the SM8720AV ideal for digital still cameras and other applications which require multiple high-preci-
sion clocks.
FEATURES
I 2.7 to 3.3V supply voltage
I 21mA typ. current consumption
(V_DD = 3.0V, all outputs with no load)
I 27MHz master clock (external input)
(internal PLL reference clock)
I Generated clocks
• 27MHz master clock (REFOUT)
• 22.5792MHz (CLK1OUT)
(ON/OFF switching using control pin)
• 48.0000MHz (CLK2OUT)
(ON/OFF switching using control pin)
• 36/45/48.6MHz (CLK3OUT)
(ON/OFF switching using control pin, fre-
quency switching)
I Output load
• 25pF (REFOUT)
• 15pF (all outputs excluding REFOUT)
I Low jitter output
• 140ps typ. peak-to-peak (REFOUT)
• 220ps typ. peak-to-peak
(CLK1OUT, CLK3OUT)
• 220ps typ. peak-to-peak (CLK2OUT)
I 16-pin VSOP package (Pb free)
PINOUT
(Top view)
VDD1 1
FIN 2
VSS1 3
CLK3OUT 4
CLK3_ON 5
SEL1 6
CLK1_ON 7
VDD2 8
16 REFOUT
15 VSS3
14 SEL2
13 CLK2_ON
12 VDD3
11 CLK2OUT
10 VSS2
9 CLK1OUT
PACKAGE DIMENSIONS
(Unit: mm)
Weight: 0.07g
APPLICATIONS
I Digital still cameras
ORDERING INFORMATION
Device
SM8720AV
Package
16-pin VSOP
0.275typ
5.1 0.2
0.65
0.10
+ 0.1
0.22 - 0.05 _{0.12 M}
0.15^+-00..105
0 to 10
0.5 0.2
NIPPON PRECISION CIRCUITS INC.—1