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参数资料
| 型号： | ICS951AI147L |
| 厂商： | Integrated Device Technology, Inc. |
| 英文描述： | LOW SKEW, 1-TO-9 DIFFERENTIAL-TOLVCMOS ZERO DELAY BUFFER |
| 中文描述： | 低偏移，1到9微分TOLVCMOS零延迟缓冲器 |
| 文件页数： | 9/15页 |
| 文件大小： | 598K |
| 代理商： | ICS951AI147L |
IDT
/ ICS
DIFFERENTIAL-TO-LVCMOS ZERO DELAY BUFFER
9
ICS87951I-147 REV A JUNE 21, 2006
ICS87951I-147
LOW SKEW, 1-TO-9, DIFFERENTIAL-TO-LVCMOS ZERO DELAY BUFFER
A
PPLICATION
I
NFORMATION
F
IGURE
1. S
INGLE
E
NDED
S
IGNAL
D
RIVING
D
IFFERENTIAL
I
NPUT
As in any high speed analog circuitry, the power supply pins
are vulnerable to random noise. The ICS87951I-147 provides
separate power supplies to isolate any high switching
noise from the outputs to the internal PLL. 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 2 illustrates how
a 10
resistor along with a 10
μ
F and a .01
μ
F bypass
capacitor should be connected to each V
DDA
pin.
P
OWER
S
UPPLY
F
ILTERING
T
ECHNIQUES
F
IGURE
2. P
OWER
S
UPPLY
F
ILTERING
10
V
DDA
10
μ
F
.01
μ
F
3.3V or 2.5V
.01
μ
F
V
DDO
Figure 1 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
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
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