參數(shù)資料
型號(hào): ICS813001AGILFT
廠商: INTEGRATED DEVICE TECHNOLOGY INC
元件分類: 時(shí)鐘產(chǎn)生/分配
英文描述: 640 MHz, OTHER CLOCK GENERATOR, PDSO24
封裝: 4.40 X 7.80 MM, 0.92 MM HEIGHT, ROHS COMPLIANT, MO-153, TSSOP-24
文件頁數(shù): 18/19頁
文件大?。?/td> 456K
代理商: ICS813001AGILFT
813001AGI
www.icst.com/products/hiperclocks.html
REV. A SEPTEMBER 2, 2005
8
Integrated
Circuit
Systems, Inc.
ICS813001I
DUAL VCXO W/3.3V, 2.5V LVPECL
FEMTOCLOCK PLL
APPLICATION INFORMATION
As in any high speed analog circuitry, the power supply pins
are vulnerable to random noise. The ICS813001I provides
separate power supplies to isolate any high switching
noise from the outputs to the internal PLL. V
CC, VCCA, and VCCO
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 10
Ω resistor along with a 10F and a .01μF bypass
capacitor should be connected to each V
CCA.
POWER SUPPLY FILTERING TECHNIQUES
FIGURE 1. POWER SUPPLY FILTERING
10
Ω
V
CCA
10
μF
.01
μF
3.3V or 2.5V
.01
μF
V
CC
Figure 2 shows how the differential input can be wired to accept
single ended levels. The reference voltage V_REF = V
CC/2 is
generated by the bias resistors R1, R2 and C1. This bias circuit
should be located as close as possible to the input pin. The ratio
FIGURE 2. SINGLE ENDED SIGNAL DRIVING DIFFERENTIAL INPUT
of R1 and R2 might need to be adjusted to position the V_REF
in the center of the input voltage swing. For example, if the
input clock swing is only 2.5V and V
CC = 3.3V, V_REF should be
1.25V and R2/R1 = 0.609.
WIRING THE DIFFERENTIAL INPUT TO ACCEPT SINGLE ENDED LEVELS
V_REF
R1
1K
C1
0.1u
R2
1K
Single Ended Clock Input
CLK
nCLK
VCC
ICS813001I
DUAL VCXO W/3.3V, 2.5V LVPECL FEMTOCLOCK PLL
TSD
IDT / ICS DUAL VCXO W/3.3V, 2.5V LVPECL FEMTOCLOCK PLL
ICS813001I
8
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