CS61880-IB 查看數據表（PDF） - Cirrus Logic

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CS61880-IB

Octal E1 Line Interface Unit

Cirrus Logic 

CS61880

18.1 Transformer Specifications

Recommended transformer specifications are

shown in Table 15. Any transformer used with the

CS61880 should meet or exceed these specifica-

tions.

Table 15. Transformer Specifications

Descriptions

Turns Ratio Receive

Turns Ratio Transmit

Primary Inductance

Primary Leakage Induc-

tance

Secondary leakage Induc-

tance

Inter winding Capacitance

ET-Constant

Specifications

1:2

1:1.15

1.5mH min. @ 1024 kHz

0.3 µH max @ 1024 kHz

0.4 µH max @ 1024 kHz

18 pF max, primary to

secondary

16V - µs min.

18.2 Crystal Oscillator Specifications

When a reference clock signal is not available, a

CMOS crystal oscillator may be used as the refer-

ence clock signal. The oscillator must have a mini-

mum symmetry of 40-60% and minimum stability

of + 100ppm.

18.3 Line Protection

Secondary protection components can be added to

the line interface circuitry to provide lightning

surge and AC power-cross immunity. For addition-

al information on the different electrical safety

standards and specific applications circuit recom-

mendations, refer to Application Note AN034, Sec-

ondary Line Protection for T1 and E1 Cards.

52

DS450PP2

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