ICS8430AY-61 IDT, Integrated Device Technology Inc, ICS8430AY-61 Datasheet - Page 9

• Manufacturer Part Number: ICS8430AY-61
• Manufacturer: IDT, Integrated Device Technology Inc
• Type: PLL Frequency Synthesizerr

Specifications of ICS8430AY-61

• Number Of Elements: 1
• Supply Current: 155mA
• Pll Input Freq (min): 14MHz
• Pll Input Freq (max): 27MHz
• Operating Supply Voltage (typ): 3.3V
• Operating Temp Range: 0C to 70C
• Package Type: LQFP
• Output Frequency Range: 20.83 to 500MHz
• Operating Supply Voltage (min): 3.135V
• Operating Supply Voltage (max): 3.465V
• Operating Temperature Classification: Commercial
• Pin Count: 32
• Lead Free Status / Rohs Status: Not Compliant

P
As in any high speed analog circuitry, the power supply pins
are vulnerable to random noise. The ICS8430-61 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 2 illustrates how
a 10Ω resistor along with a 10μF and a .01μF bypass
capacitor should be connected to each V
resistor can also be replaced by a ferrite bead.
C
The ICS8430-61 has been characterized with 18pF parallel
resonant crystals. The capacitor values, C1 and C2, shown in
Figure 3 below were determined using an 18pF parallel reso-
nant crystal and were chosen to minimize the ppm error. These
8430AY-61
OWER
RYSTAL
S
I
UPPLY
NPUT
I
F
NTERFACE
ILTERING
18pF Parallel Cry stal
T
ECHNIQUES
A
X1
PPLICATION
CCA
CC
Figure 3. C
, V
pin. The 10Ω
CCA
, and V
www.idt.com
RYSTAL
C1
22p
C2
22p
500MH
CCO
9
I
XTAL_IN
XTAL_OUT
I
NFORMATION
same capacitor values will tune any 18pF parallel resonant
crystal over the frequency range and other parameters speci-
fied in this data sheet. The optimum C1 and C2 values can be
slightly adjusted for different board layouts.
NPU
t I
Z
NTERFACE
, C
RYSTAL
LVPECL F
F
ICS84332
IGURE
ICS8430-61
-
2. P
TO
V
V
CCA
CC
-3.3V, 2.5V D
OWER
REQUENCY
.01µF
.01µF
S
UPPLY
3.3V
ICS8430-61
10Ω
10µF
F
ILTERING
S
IFFERENTIAL
YNTHESIZER
REV. D JULY 27, 2010