参数资料
型号: KS8997
厂商: Micrel Inc
文件页数: 31/39页
文件大小: 0K
描述: IC SWITCH 10/100 8PORT 128PQFP
标准包装: 66
系列: *
类型: *
应用: *
安装类型: 表面贴装
封装/外壳: 128-BFQFP
供应商设备封装: 128-PQFP(14x20)
包装: 散装
Micrel, Inc.
KS8997/KSZ8997
February 2007
37
M9999-022807-1.1
Selection of Isolation Transformer
(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.)
350H
100mV, 100 KHz, 8mA
Leakage Inductance (max.)
0.4H
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.
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
±100
ppm
Maximum Jitter
150
ps(pk-pk)
The following transformer vendors provide compatible magnetic parts for Micrel’s device:
4-Port Integrated
Single-Port
Type
Vendor
Part
Vendor
Part
Transformer only
Pulse
H1164
Pulse
H1102
Table 8. Qualified Magnetics Lists
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