參數(shù)資料
型號(hào): KS8721BA4 TR
廠商: Micrel Inc
文件頁數(shù): 27/35頁
文件大小: 0K
描述: TXRX 10/100 3.3V 48-SSOP
標(biāo)準(zhǔn)包裝: 1,000
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: 帶卷 (TR)
配用: 576-1006-ND - BOARD EVAL EXPERIMENT KS8721B
其它名稱: KS8721BA4TR
KS8721BA4TR-ND
Micrel, Inc.
KS8721BL/SL
June 2009
33
M9999-062509-1.3
Selection of Isolation Transformers
(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.
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
Note
:
1.
The IEEE 802.3u standard for 100BASE-TX assumes a transformer loss of 0.5dB. For the transmit line transformer, insertion loss of up to 1.3dB
can be compensated or by increasing the line drive current by means of reducing the ISET resistor value. Please select the transformer that
supports auto-MDI/MDI-X.
Selection of Reference Crystal
An oscillator or crystal with the following typical characteristics is recommended.
Characteristics
Value
Units
Frequency
25
MHz
Frequency tolerance (max)
±100
ppm
Load capacitance (max)
20
pF
Series resistance (max)
40
Ω
Single Port Magnetic Manufacturer
Part Number
Auto MDIX
Number 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 9. Qualified Transformer Lists
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