Precision Edge SY58022U Micrel, Inc. R2 82Ω R2 82Ω ZO " />
參數(shù)資料
型號: SY58022UMG
廠商: Micrel Inc
文件頁數(shù): 8/9頁
文件大?。?/td> 0K
描述: IC CLK BUFFER TRANSLA 1:4 16-MLF
標準包裝: 100
系列: Precision Edge®
類型: 扇出緩沖器(分配),變換器
電路數(shù): 1
比率 - 輸入:輸出: 1:4
差分 - 輸入:輸出: 是/是
輸入: CML,LVDS,LVPECL
輸出: LVPECL
頻率 - 最大: 5.5GHz
電源電壓: 2.375 V ~ 3.6 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 16-VFQFN 裸露焊盤,16-MLF?
供應商設備封裝: 16-MLF?(3x3)
包裝: 管件
產(chǎn)品目錄頁面: 1083 (CN2011-ZH PDF)
其它名稱: 576-2049-5
SY58022UMG-ND
8
Precision Edge
SY58022U
Micrel, Inc.
R2
82Ω
R2
82Ω
ZO = 50Ω
+3.3V
VT = VCC -2V
R1
130Ω
R1
130Ω
+3.3V
SY58022U
Figure 4. Parallel Termination–Thevenin Equivalent
Notes:
1. For +2.5V systems: R1 = 250Ω, R2 = 62.5Ω.
2. For +3.3V systems: R1 = 130Ω, R2 = 83Ω.
Z = 50Ω
50Ω
+3.3V
“source”
“destination”
Rb C1
0.01F
(optional)
SY58022U
Figure 5. Three-Resistor “Y–Termination”
Notes:
1. Power-saving alternative to Thevenin termination.
2. Place termination resistors as close to destination inputs as possible.
3. R
b resistor sets the DC bias voltage, equal to VT.
For +2.5V systems R
b = 19Ω.
For +3.3V systems R
b = 46Ω to 50Ω.
4. C1 is an optional bypass capacitor intended to compensate for any
t
r/tf mismatches.
OUTPUT TERMINATION RECOMMENDATIONS
LVPECL outputs have very low output impedance (open
emitter), and small signal swing which results in low EMI
(electro-magnetic interference). The LVPECL is ideal for
driving 50Ω- and 100Ω-controlled impedance transmission
lines. In addition, LVPECL is compatible for driving standard
PECL inputs since PECL inputs require only 100mV input
swing. Further, there are several techniques in terminating
the LVPECL outputs, as shown in Figure 4 through 6.
+3.3V
VT = VCC -2V
Q
/Q
VT = VCC -1.3V
SY58022U
Figure 6. Terminating Unused I/O
Notes:
1. Unused output (/Q) must be terminated to balance the output.
2. For +2.5V systems: R1 = 250Ω, R2 = 62.5Ω, R3 = 1.25kΩ,
R4 = 1.2kΩ.
For +3.3V systems: R1 = 130Ω, R2 = 82Ω, R3 = 1kΩ, R4 = 1.6kΩ.
3. Unused output pairs (Q and /Q) may be left oating.
Part Number Function
Data Sheet Link
SY58020U
6GHz, 1:4 CML Fanout Buffer/Translator
http://www.micrel.com/product-info/prod/ucts/sy58020u.shtml
Internal I/O Termination
SY58021U
4GHz, 1:4 LVPECL Fanout Buffer/Translator
http://www.micrel.com/product-info/products/sy58021u.shtml
with Internal Termination
SY58022U
5.5GHz, 1:4 Fanout Buffer/Translator w/400mV
http://www.micrel.com/product-info/products/sy58022u.shtml
LVPECL Outputs and Internal Input Termination
RELATED MICREL PRODUCTS AND SUPPORT DOCUMENTATION
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