KS8721SL A4 Micrel Inc, KS8721SL A4 Datasheet - Page 32

• Manufacturer Part Number: KS8721SL A4
• Manufacturer: Micrel Inc

Specifications of KS8721SL A4

• Lead Free Status / RoHS Status: Not Compliant

KS8721BL/SL
Selection of Isolation Transformer
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.
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
Selection of Reference Crystal
An oscillator or crystal with the following typical characteristics is recommended.
M9999-022105
Single Port
Magnetic Manufacturer
Pulse
Bel Fuse
YCL
Transpower
Delta
LanKom
Integrated Transformers
Pulse
Pulse
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.
Characteristic
Turns Ratio
Open-Circuit Inductance (min.)
Leakage Inductance (max.)
Inter-Winding Capacitance (max.)
D.C. Resistance (max.)
Insertion Loss (max.)
HIPOT (min.)
Characteristic
Frequency
Frequency Tolerance (max.)
Load Capacitance (max.)
Series Resistance (max.)
Part Number
H1102
S558-5999-U7
PT163020
HB726
LF8505
LF-H41S
J0011D21
J00-0061
Value
1 CT : 1 CT
350µH
0.4µH
12pF
0.9Ω
1.0dB
1500Vrms
Value
25.00000
±100
20
40
Table 9. Qualified Transformer Lists
(1)
32
Test Condition
100mV, 100kHz, 8mA
1MHz (min.)
0MHz to 65MHz
Units
MHz
ppm
pF
Ω
Auto MDIX
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
February 2005
Number
of Ports
1
1
1
1
1
1
1
1
Micrel