ICS8430-71B ICST [Integrated Circuit Systems], ICS8430-71B Datasheet - Page 8

• Manufacturer Part Number: ICS8430-71B
• Description: 700MHZ, LOW JITTER, CRYSTAL INTERFACE / LVCMOS-TO-3.3V LVPECL FREQUENCY SYNTHESIZER
• Manufacturer: ICST [Integrated Circuit Systems]

P
As in any high speed analog circuitry, the power supply pins
are vulnerable to random noise. The ICS8430B-71 provides
separate power supplies to isolate any high switching
noise from the outputs to the internal PLL. V
should be individually connected to the power supply
plane through vias, and bypass capacitors should be
used for each pin. To achieve optimum jitter performance,
power supply isolation is required. Figure 1 illustrates how
a 10Ω resistor along with a 10μF and a .01μF bypass
capacitor should be connected to each V
C
A crystal can be characterized for either series or parallel
mode operation. The ICS8430B-71 has a built-in crystal
oscillator circuit. This interface can accept either a series or
parallel crystal without additional components and generate
8430BY -71
OWER
RYSTAL
S
UPPLY
I
NPUT
Integrated
Circuit
Systems, Inc.
F
I
NTERFACE
ILTERING
T
18pF Parallel Crystal
ECHNIQUES
A
CCA
X1
www.icst.com/products/hiperclocks.html
PPLICATION
CC
Figure 2. C
pin.
PRELIMINARY
, V
LVCMOS-
CCA
, and V
RYSTAL
C1
18p
C2
22p
CCO
8
I
TO
I
700MH
frequencies with accuracy suitable for most applications.
Additional accuracy can be achieved by adding two small
capacitors C1 and C2 as shown in Figure 2.
NFORMATION
NPU
XTAL_OUT
XTAL_IN
-3.3V LVPECL F
t I
NTERFACE
Z
F
, L
IGURE
OW
1. P
V
J
V
CCA
CC
ITTER
OWER
REQUENCY
.01μF
.01μF
S
, C
UPPLY
ICS8430B-71
3.3V
RYSTAL
F
10Ω
10μF
ILTERING
REV. A SEPTEMBER 20, 2005
S
YNTHESIZER
I
NTERFACE
/