Selection of Isolation Transformer(Note 1) One simple 1:1 isolation trans" />
參數(shù)資料
型號： KS8999I
廠商： Micrel Inc
文件頁數(shù)： 47/52頁
文件大小： 0K
描述： IC SWITCH 9-PORT 10/100 208-PQFP
標準包裝： 100
系列： *
類型： *
應用： *
安裝類型： 表面貼裝
封裝/外殼： 208-MQFP，208-PQFP
供應商設備封裝： 208-PQFP（28x28）
包裝： 散裝
配用： 576-1023-ND - BOARD EVAL EXPERIMENT FOR KS8999
January 2005
51
KS8999
Micrel
Selection of Isolation Transformer(Note 1)
One simple 1:1 isolation transformer is needed at the line interface. An isolation transformer with integrated common-mode
choke is recommended for exceeding FCC requirements. The following table gives recommended transformer characteristics.
Characteristics Name
Value
Test Condition
Turns Ratio
1 CT : 1 CT
Open-Circuit Inductance (min.)
350
H
100mV, 100 KHz, 8mA
Leakage Inductance (max.)
0.4
H
1MHz (min.)
Inter-Winding Capacitance (max.)
12pF
D.C. Resistance (max.)
0.9
Insertion Loss (max.)
1.0dB
0MHz to 65MHz
HIPOT (min.)
1500Vrms
Note 1.
The IEEE 802.3u standard for 100BaseTX assumes a transformer loss of 0.5dB. For the transmit line transformer, insertion loss of up to
1.3dB can be compensated by increasing the line drive current by means of reducing the ISET resistor value.
The following transformer vendors provide compatible magnetic parts for Micrel’s device:
4-Port Integrated
Auto
Number
Single Port
Auto
Number
Vendor
Part
MDIX
of Port
Vendor
Part
MDIX
of Port
Pulse
H1164
Yes
4
Pulse
H1102
Yes
1
Bel Fuse
558-5999-Q9
Yes
4
Bel Fuse
S558-5999-U7
Yes
1
YCL
PH406466
Yes
4
YCL
PT163020
Yes
1
Transpower
HB826-2
Yes
4
Transpower
HB726
Yes
1
Delta
LF8731
Yes
4
Delta
LF8505
Yes
1
Table 15. Qualified Magnetics Vendor Lists
Selection of Reference Oscillator/Crystal
An oscillator or crystal with the following typical characteristics is recommended.
Characteristics Name
Value
Test Condition
Frequency
25.00000
MHz
Maximum Frequency Tolerance
±50
ppm
Maximum Jitter
150
ps(pk-pk)
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