ICS843002I-40 Datasheet, PDF (2/21 Pages) Integrated Circuit Systems – 175MHZ, FEMTOCLOCKS-TM VCXO BASED SONET/SDH JITTER ATTENUATOR

Integrated
Circuit
Systems, Inc.
BLOCK DIAGRAM
PRELIMINARY
ICS843002I-40
175MHZ, FEMTOCLOCKS™ VCXO BASED
SONET/SDH JITTER ATTENUATOR
External
Loop
Components
19.44 MHz
Pullable
xtal
ICS843002-40
ISET
LF0
LF1
V_{CCO_LVCMOS}
CLK1
nCLK1
LOR1
CLK0
nCLK0
LOR0
CLK_SEL
R_SEL2:0 ³
Activity
Detector
1
0
Activity
Detector
R Divider =
1, 2, 4, 8,
16 or 32
Divide
by 32
Phase
Detector
Charge
Pump
and Loop
Filter
VCXO
19.44 MHz
Divide
by 32
VCXO Jitter Attenuation PLL
622.08 MHz
110
FemtoClock
PLL
111
110
x32
C0 Divider =
4, 8, 32, or HiZ
111
C1 Divider =
4, 8, 32, or HiZ
V_{CCO_LVPECL}
QA
nQA
2
QA_SEL1:0
QB
nQB
2 _{QB_SEL1:0}
NOTE 1: 19.44MHz VCXO crystal shown is typical for SONET/SDH device applications.
843002AKI-40
www.icst.com/products/hiperclocks.html
2
REV. A JUNE 22, 2005