參數(shù)資料
型號(hào)： ICS84327AM
英文描述： CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER W/INTEGRATED FANOUT BUFFER
中文描述： 水晶到3.3的LVPECL頻率合成瓦/多功能扇出緩沖器
文件頁(yè)數(shù)： 7/15頁(yè)
文件大?。?/td> 249K
代理商： ICS84327AM
84327AM
www.icst.com/products/hiperclocks.html
REV. A SEPTEMBER 18, 2003
7
ICS84327
C
RYSTAL
-
TO
-3.3V LVPECL
F
REQUENCY
S
YNTHESIZER
W
/I
NTEGRATED
F
ANOUT
B
UFFER
PRELIMINARY
As in any high speed analog circuitry, the power supply pins
are vulnerable to random noise. The ICS84327 provides sepa-
rate power supplies to isolate any high switching
noise from the outputs to the internal PLL. V
CC
, V
CCA
and V
CCO
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 llustrates how a 10
resistor along
with a 10
μ
F and a .01
μ
F bypass capacitor should be con-
nected to each V
CCA
pin.
P
OWER
S
UPPLY
F
ILTERING
T
ECHNIQUES
F
IGURE
1. P
OWER
S
UPPLY
F
ILTERING
10
V
CCA
10
μ
F
.01
μ
F
3.3V
.01
μ
F
V
CC
T
ERMINATION
FOR
3.3V LVPECL O
UTPUT
The clock layout topology shown below is a typical termina-
tion for LVPECL outputs. The two different layouts mentioned
are recommended only as guidelines.
V
CC
- 2V
50
50
RTT
Z
o
= 50
Z
o
= 50
FOUT
FIN
RTT =
Z
o
1
(V
OH
+ V
OL
/ V
CC
–
2)
–
2
3.3V
125
125
84
84
Z
o
= 50
Z
o
= 50
FOUT
FIN
FOUT and nFOUT are low impedance follower outputs that
generate ECL/LVPECL compatible outputs. Therefore, termi-
nating resistors (DC current path to ground) or current
sources must be used for functionality. These outputs are
F
IGURE
2B. LVPECL O
UTPUT
T
ERMINATION
F
IGURE
2A. LVPECL O
UTPUT
T
ERMINATION
designed to drive 50
transmission lines. Matched impedance
techniques should be used to maximize operating
frequency and minimize signal distortion. Figures 2A and 2B
show two different layouts which are recommended only
as guidelines. Other suitable clock layouts may exist and it
would be recommended that the board designers simulate to
guarantee compatibility across all printed circuit and clock
component process variations.
A
PPLICATION
I
NFORMATION
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ICS84327AMT 制造商:ICS 制造商全稱(chēng):ICS 功能描述:CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER W/INTEGRATED FANOUT BUFFER
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