参数资料
型号: ICS874003AG-02T
厂商: INTEGRATED DEVICE TECHNOLOGY INC
元件分类: 时钟及定时
英文描述: PCI EXPRESS⑩ JITTER ATTENUATOR
中文描述: 874003 SERIES, PLL BASED CLOCK DRIVER, 3 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PDSO20
封装: 6.50 X 4.40 MM, 0.92 MM HEIGHT, MO-153, TSSOP-20
文件页数: 7/14页
文件大小: 629K
代理商: ICS874003AG-02T
IDT
/ ICS
PCI EXPRESS JITTER ATTENUATOR
7
ICS874003AG-02 REV A AUGUST 29, 2006
ICS874003-02
PCI EXPRESS JITTER ATTENUATOR
A
PPLICATION
I
NFORMATION
Figure 2 shows how the differential input can be wired to accept
single ended levels. The reference voltage V_REF = V
/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
F
IGURE
2. S
INGLE
E
NDED
S
IGNAL
D
RIVING
D
IFFERENTIAL
I
NPUT
W
IRING
THE
D
IFFERENTIAL
I
NPUT
TO
A
CCEPT
S
INGLE
E
NDED
L
EVELS
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
DD
= 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
CLK
nCLK
VDD
P
OWER
S
UPPLY
F
ILTERING
T
ECHNIQUES
As in any high speed analog circuitry, the power supply pins
are vulnerable to random noise. The ICS874003-02 provides
separate power supplies to isolate any high switching noise
from the outputs to the internal PLL. V
, V
, and 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 10
resistor along with a 10
μ
F and a .01
μ
F bypass
capacitor should be connected to each V
CCA
pin.
F
IGURE
1. P
OWER
S
UPPLY
F
ILTERING
10
V
DDA
10
μ
F
.01
μ
F
3.3V
.01
μ
F
V
DD
相关PDF资料
PDF描述
ICS87951-147I LOW SKEW, 1-TO-9 DIFFERENTIAL-TOLVCMOS ZERO DELAY BUFFER
ICS87951AYI-147 LOW SKEW, 1-TO-9 DIFFERENTIAL-TOLVCMOS ZERO DELAY BUFFER
ICS87951AYI-147LF LOW SKEW, 1-TO-9 DIFFERENTIAL-TOLVCMOS ZERO DELAY BUFFER
ICS87951AYI-147LFT LOW SKEW, 1-TO-9 DIFFERENTIAL-TOLVCMOS ZERO DELAY BUFFER
ICS87951AYI-147T LOW SKEW, 1-TO-9 DIFFERENTIAL-TOLVCMOS ZERO DELAY BUFFER
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