Micrel, Inc. M9999-030106 30 March 2006 Selection of Isolation Transformer(Note 1)
參數(shù)資料
型號(hào)： KSZ8721BI
廠商： Micrel Inc
文件頁(yè)數(shù)： 24/32頁(yè)
文件大?。?/td> 0K
描述： IC TXRX PHY 10/100 2.5V 48SSOP
標(biāo)準(zhǔn)包裝： 30
類型： 收發(fā)器
驅(qū)動(dòng)器/接收器數(shù)： 1/1
規(guī)程： MII，RMII
電源電壓： 2.375 V ~ 2.625 V
安裝類型： 表面貼裝
封裝/外殼： 48-BSSOP（0.295"，7.50mm 寬）
供應(yīng)商設(shè)備封裝： 48-SSOP
包裝： 管件
產(chǎn)品目錄頁(yè)面： 1080 (CN2011-ZH PDF)
配用： 576-1627-ND - BOARD EVALUATION FOR KSZ8721BMC
576-1626-ND - BOARD EVALUATION FOR KSZ8721BL
其它名稱： 576-1027
KS8721B/BT
Micrel, Inc.
M9999-030106
30
March 2006
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 character-
istics.
Characteristics Name
Value
Test Condition
Turns Ratio
1 CT : 1 CT
Open-Circuit Inductance (min.)
350H
100mV, 100 KHz, 8 mA
Leakage Inductance (max.)
0.4H
1MHz (min.)
Inter-Winding Capacitance (max.)
12pF
D.C. Resistance (max.)
0.9Ω
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 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
Load Capacitance (max.)
20
pF
Series Resistance (max.)
40
Ω
Frequency Tolerance (max.)
±100
ppm
Load Capacitance (max.)
20
pF
Series Resistance (max.)
40
Ω
Characteristics Name
Value
Units
Frequency
25.00000
MHz
Frequency Tolerance (max.)
±100
ppm
Load Capacitance (max.)
20
pF
Series Resistance (max.)
40
Ω
Characteristics Name
Value
Units
Frequency
25.00000
MHz
Frequency Tolerance (max.)
±100
ppm
Load Capacitance (max.)
20
pF
Series Resistance (max.)
40
Ω
Open-Circuit Inductance (min.)
350H
100mV, 100 KHz, 8 mA
Leakage Inductance (max.)
0.4H
1MHz (min.)
Inter-Winding Capacitance (max.)
12pF
D.C. Resistance (max.)
0.9Ω
Insertion Loss (max.)
1.0dB
0MHz to 65MHz
HIPOT (min.)
1500Vrms
Characteristics Name
Value
Test Condition
Turns Ratio
1 CT : 1 CT
Open-Circuit Inductance (min.)
350H
100mV, 100 KHz, 8 mA
Leakage Inductance (max.)
0.4H
1MHz (min.)
Inter-Winding Capacitance (max.)
12pF
D.C. Resistance (max.)
0.9Ω
Insertion Loss (max.)
1.0dB
0MHz to 65MHz
HIPOT (min.)
1500Vrms
Characteristics Name
Value
Test Condition
Open-Circuit Inductance (min.)
350H
100mV, 100 KHz, 8 mA
Leakage Inductance (max.)
0.4H
1MHz (min.)
Insertion Loss (max.)
1.0dB
0MHz to 65MHz
Single Port
Number
Magnetic Manufacturer
Part Number
Auto MDIX
of Ports
Pulse
H1102
Yes
1
Bel Fuse
S558-5999-U7
Yes
1
YCL
PT163020
Yes
1
Transpower
HB726
Yes
1
Delta
LF8505
Yes
1
LanKom
LF-H41S
Yes
1
Integrated Transformers
Pulse
J0011D21
Yes
1
Pulse
J00-0061
Yes
1
Table 8. Qualied Transformer Lists
Single Port
Number
Magnetic Manufacturer
Part Number
Auto MDIX
of Ports
Pulse
H1102
Yes
1
Bel Fuse
S558-5999-U7
Yes
1
YCL
PT163020
Yes
1
Transpower
HB726
Yes
1
Delta
LF8505
Yes
1
LanKom
LF-H41S
Yes
1
Pulse
J0011D21
Yes
1
Pulse
J00-0061
Yes
1
Single Port
Number
Magnetic Manufacturer
Part Number
Auto MDIX
of Ports
Pulse
H1102
Yes
1
Bel Fuse
S558-5999-U7
Yes
1
YCL
PT163020
Yes
1
Transpower
HB726
Yes
1
Delta
LF8505
Yes
1
LanKom
LF-H41S
Yes
1
Single Port
Number
Magnetic Manufacturer
Part Number
Auto MDIX
of Ports
Pulse
H1102
Yes
1
Bel Fuse
S558-5999-U7
Yes
1
YCL
PT163020
Yes
1
Transpower
HB726
Yes
1
Delta
LF8505
Yes
1
LanKom
LF-H41S
Yes
1
Single Port
Number
Magnetic Manufacturer
Part Number
Auto MDIX
of Ports
Pulse
H1102
Yes
1
Bel Fuse
S558-5999-U7
Yes
1
YCL
PT163020
Yes
1
Transpower
HB726
Yes
1
Delta
LF8505
Yes
1
LanKom
LF-H41S
Yes
1
Pulse
J0011D21
Yes
1
Pulse
J00-0061
Yes
1
Pulse
J0011D21
Yes
1
Pulse
J00-0061
Yes
1
Pulse
J0011D21
Yes
1
Pulse
J00-0061
Yes
1
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