KSZ8841-PMQL-EVAL(2007) Ver la hoja de datos (PDF) - Micrel

Número de pieza

componentes Descripción

Fabricante

KSZ8841-PMQL-EVAL
(Rev.:2007)

Single-Port Ethernet MAC Controller with PCI Interface

Micrel 

Micrel, Inc.

KSZ8841-16/32 MQL/MVL/MBL

Selection of Isolation Transformers

A 1:1 isolation transformer is required at the line interface. An isolation transformer with integrated common-mode choke

is recommended for exceeding FCC requirements.

Table 27 gives recommended transformer characteristics.

Parameter

Turns ratio

Open-circuit inductance (min)

Leakage inductance (max)

Inter-winding capacitance (max)

D.C. resistance (max)

Insertion loss (max)

HIPOT (min)

Value

1 CT : 1 CT

350µH

0.4µH

12pF

0.9Ω

1.0dB

1500Vrms

Test Condition

100mV, 100kHz, 8mA

1MHz (min)

0MHz – 65MHz

Table 27. Transformer Selection Criteria

Magnetic Manufacturer Part Number

Auto MDI-X

Pulse

Pulse (low cost)

Transpower

Bel Fuse

Delta

LanKom

TDK (Mag Jack)

H1102

Yes

H1260

Yes

HB726

Yes

S558-5999-U7

Yes

LF8505

Yes

LF-H41S

Yes

TLA-6T718

Yes

Table 28. Qualified Single Port Magnetics

Number of Port

1

1

1

1

1

1

1

Selection of Reference Crystal

Chacteristics

Frequency

Frequency tolerance (max)

Load capacitance (max)

Series resistance

Value

25

±50

20

25

Units

MHz

ppm

pF

Ω

Table 29. Typical Reference Crystal Characteristics

October 2007

100

M9999-102207-1.6

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