參數(shù)資料
型號(hào): KSZ8851-16MLLJ
廠商: Micrel Inc
文件頁(yè)數(shù): 86/90頁(yè)
文件大小: 0K
描述: IC CTLR MAC 1PORT NON-PCI 48LQFP
標(biāo)準(zhǔn)包裝: 250
控制器類(lèi)型: 以太網(wǎng)控制器,MAC/PHY
接口: 總線
電源電壓: 1.8V,2.5V,3.3V
工作溫度: -40°C ~ 125°C
安裝類(lèi)型: 表面貼裝
封裝/外殼: 48-LQFP
供應(yīng)商設(shè)備封裝: 48-LQFP(7x7)
包裝: 托盤(pán)
其它名稱(chēng): 576-3629
KSZ8851-16MLLJ-ND
Micrel, Inc.
KSZ8851-16MLLJ
March 2010
87
M9999-030210-1.0
Selection of Isolation Transformers
A 1:1 isolation transformer is required at the line interface. An isolation transformer with integrated common-mode choke
is recommended for exceeding FCC requirements.
Table 19 gives recommended transformer characteristics.
Parameter
Value
Test Condition
Turns ratio
1 CT : 1 CT
Open-circuit inductance (min)
350
μH
100mV, 100kHz, 8mA
Leakage inductance (max)
0.4
μH
1MHz (min)
Inter-winding capacitance (max)
12pF
D.C. resistance (max)
0.9
Ω
Insertion loss (max)
1.0dB
0MHz – 65MHz
HIPOT (min)
1500Vrms
Table 19. Transformer Selection Criteria
Magnetic Manufacturer
Part Number
Auto MDI-X
Number of Port
Pulse
H1102
Yes
1
Pulse (low cost)
H1260
Yes
1
Transpower
HB726
Yes
1
Bel Fuse
S558-5999-U7
Yes
1
Delta
LF8505
Yes
1
LanKom
LF-H41S
Yes
1
TDK (Mag Jack)
TLA-6T718
Yes
1
Table 20. Qualified Single Port Magnetics
Selection of Reference Crystal
Chacteristics
Value
Units
Frequency
25
MHz
Frequency tolerance (max)
±50
ppm
Load capacitance (max)
20
pF
Series resistance
40
Ω
Table 21. Typical Reference Crystal Characteristics
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