Selection of Isolation Transformer(Note 1) One simple 1:1 isolation tr" />
參數(shù)資料
型號: KS8993
廠商: Micrel Inc
文件頁數(shù): 28/35頁
文件大小: 0K
描述: IC SWITCH 10/100 3PORT 128PQFP
標準包裝: 66
系列: *
類型: *
應(yīng)用: *
安裝類型: 表面貼裝
封裝/外殼: 128-BFQFP
供應(yīng)商設(shè)備封裝: 128-PQFP(14x20)
配用: 576-1011-ND - BOARD EVAL EXPERIMENT FOR KS8993
KS8993
Micrel
KS8993
34
May 2005
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 0.5 dB. 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.
Selection of Reference Crystal
An oscillator or crystal with the following typical characteristics is recommended.
Characteristics Name
Value
Units
Frequency
25.00000
MHz
Frequency Tolerance (max.)
±100
ppm
The following transformer vendors provide pin-to-pin compatible parts for Micrel’s device:
Type
Quad
Single
Vendor
Part
Vendor
Part
Transformer only
Pulse
H1060
Pulse
H1012
YCL
PH406080
YCL
20PMT04
Trans-Power
HB826-10
Trans-Power
HB614-1-LP
Integrated RJ45 and Transformer
Trans-Power
RJG4-754-C-NL
Trans-Power
RJ754-C-NL
Table 12. Qualified Transformer Lists
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