參數(shù)資料
型號(hào): ICS8735AY-01T
廠商: INTEGRATED DEVICE TECHNOLOGY INC
元件分類: 時(shí)鐘及定時(shí)
英文描述: 8735 SERIES, PLL BASED CLOCK DRIVER, 5 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PQFP32
封裝: 7 X 7 MM, 1.40 MM HEIGHT, MS-026BBA, LQFP-32
文件頁數(shù): 17/17頁
文件大小: 252K
代理商: ICS8735AY-01T
8735AY-01
www.icst.com/products/hiperclocks.html
REV. G APRIL 13, 2007
9
Integrated
Circuit
Systems, Inc.
ICS8735-01
1:5 DIFFERENTIAL-TO-3.3V LVPECL
ZERO DELAY CLOCK GENERATOR
The schematic of the ICS8735-01 layout example is shown in
Figure 5A. The ICS8735-01 recommended PCB board layout
for this example is shown in Figure 5B. This layout example is
used as a general guideline. The layout in the actual system will
depend on the selected component types, the density of the
components, the density of the traces, and the stack up of the
P.C. board.
FIGURE 5A. ICS8735-01 LVPECL ZERO DELAY BUFFER SCHEMATIC EXAMPLE
LAYOUT GUIDELINE
VCCO=3.3V
Bypass capacitor located near the power pins
R9
50
SEL0
VCC
RU6
1K
VCCO
CLK_SEL
C5
0.1uF
RD4
SP
3.3V
PL
L
_
SEL
RD6
SP
(155.52 MHz)
Zo = 50 Ohm
R6
50
3.3V PECL Driver
LVPECL_input
+
-
R2
50
Zo = 50 Ohm
VCC=3.3V
R7
10
C7
0.1uF
SEL0
C2
0.1uF
C11
0.01u
Zo = 50 Ohm
SEL
3
(U1-9)
(U1-32)
VCC
RD2
1K
(U1-16)
C6
0.1uF
RD5
1K
R3
50
SEL1
RU5
SP
(77.76 MHz)
SEL[3:0] = 0101,
Divide by 2
RU4
1K
Output
Termination
Example
C16
10u
CLK_SEL
RD3
SP
RD7
1K
SP = Space (i.e. not intstalled)
VCC
U1
8735-01
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
32
31
30
29
28
27
26
25
SEL0
SEL1
CLK0
nCLK0
CLK1
nCLK1
CLK_SEL
MR
VC
C
nF
B
_
IN
FB
_
IN
SEL
2
VEE
nQ0
Q0
V
CCO
VCCO
nQ1
Q1
nQ2
Q2
nQ3
Q3
VCCO
VC
C
PL
L
_
SEL
V
CCA
SEL
3
VEE
Q4
nQ4
V
CCO
VCCO
RU7
SP
(U1-24)
VCCA
RU3
1K
R10
50
(U1-17)
RU2
SP
PLL_SEL
R5
50
C1
0.1uF
(U1-25)
SEL2
SEL3
C4
0.1uF
VCC
R1
50
SEL2
R8
50
SEL1
R4
50
Zo = 50 Ohm
As in any high speed analog circuitry, the power supply pins
are vulnerable to random noise. The ICS8735-01 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 4 illustrates how
a 10
Ω resistor along with a 10μF and a .01μF bypass
capacitor should be connected to each V
CCA pin.
POWER SUPPLY FILTERING TECHNIQUES
FIGURE 4. POWER SUPPLY FILTERING
10
Ω
V
CCA
10
μF
.01
μF
3.3V
.01
μF
V
CC
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