參數(shù)資料
型號(hào): ICS873995AY
元件分類: 時(shí)鐘及定時(shí)
英文描述: 873995 SERIES, PLL BASED CLOCK DRIVER, 6 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PQFP48
封裝: 7 X 7 MM, 1 MM HEIGHT, MS-026, TQFP-48
文件頁(yè)數(shù): 16/16頁(yè)
文件大小: 239K
代理商: ICS873995AY
873995AY
www.icst.com/products/hiperclocks.html
REV. A APRIL 12, 2006
9
Integrated
Circuit
Systems, Inc.
ICS873995
DIFFERENTIAL-TO-3.3V LVPECL
ZERO DELAY/MULTIPLIER/DIVIDER
PRELIMINARY
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
WIRING THE DIFFERENTIAL INPUT TO ACCEPT SINGLE ENDED LEVELS
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.
V_REF
R1
1K
C1
0.1u
R2
1K
Single Ended Clock Input
CLKx
nCLKx
VCC
As in any high speed analog circuitry, the power supply pins
are vulnerable to random noise. The ICS873995 provides sepa-
rate power supplies to isolate any high switching
noise from the outputs to the internal PLL. V
CC, VCCA and VCCOx
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 iso-
lation is required. Figure 1 illustrates how a 10
Ω resistor along
with a 10
μF and a .01μF bypass capacitor should be con-
nected to each V
CCA pin.
FIGURE 1. POWER SUPPLY FILTERING
10
Ω
V
CCA
10
μF
.01
μF
3.3V
.01
μF
V
CC
POWER SUPPLY FILTERING TECHNIQUES
相關(guān)PDF資料
PDF描述
ICS873995AYLFT 873995 SERIES, PLL BASED CLOCK DRIVER, 6 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PQFP48
ICS873996AYLFT 873996 SERIES, PLL BASED CLOCK DRIVER, 6 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PQFP48
ICS873996AYT 873996 SERIES, PLL BASED CLOCK DRIVER, 6 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PQFP48
ICS873996AY 873996 SERIES, PLL BASED CLOCK DRIVER, 6 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PQFP48
ICS873996AYLFT 873996 SERIES, PLL BASED CLOCK DRIVER, 6 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PQFP48
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