參數(shù)資料
型號(hào): SY89529L
英文描述: High Voltage Rectifer Diodes
中文描述: 3.3精密200MHz的擴(kuò)頻時(shí)鐘合成器
文件頁數(shù): 6/10頁
文件大?。?/td> 314K
代理商: SY89529L
6
ClockWorks
SY89529L
Micrel
Power Supply Filtering Techniques
As in any high speed integrated circuits, power supply
filtering is very important. V
CC1
, V
CC
_Analog, V
CC_TTL
and
V
CC_OUT
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, better
power-supply isolation is required. In this case a ferrite bead
along with a 1
μ
F and a 0.01
μ
F bypass capacitor should be
connected to each power supply pin. Figure 6 illustrates
power-supply filtering using ferrite beads and bypass
capacitors.
For V
Analog,V
V
use ferrite bead = 200mA, 0.45
DC,
Murata P/N BLM21A1025
*For V
use ferrite bead = 3A, 0.025
DC,
Murata, P/N BLM31P005
*Componet sizs: 0805
1
μ
F
22
μ
F
0.01
μ
F
Ferrite Bead*
Power Supply
side
Device
side
V
Pins
Figure 5. Power Supply Filtering
Termination for PECL Outputs
The differential PECL outputs, FOUT and /FOUT, are low-
impedance emitter-follower outputs. Therefore, terminating
resistors (DC current path to ground) or current sources must
be used for functionality. These outputs are designed to drive
50
transmission lines. Matched impedance techniques should
be used to maximize operating frequency and minimize signal
distortion. There are a few simple termination schemes.
Figure 7 shows a common 3-resistor termination scheme. For
more termination examples, see Micrel
s Application Note 9
online at www.micrel.com.
z = 50
Low impedance,
emitter-follower outputs
z = 50
50
FOUT
/FOUT
50
SY89529L
3-resistor network
available*
*3-resistor network = Thin-film Technologies,
P/N TFT-RN1632-AN1DNC
50
Figure7. LVPECL Output Termination
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