CS61880 datasheet(52/70 Pages) CIRRUS

номер детали	CS61880

подробное описание детали	OCTAL E1 LINE INTERFACE UNIT

PDF	70 Pages

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производитель	CIRRUS [Cirrus Logic]

домашняя страница	http://www.cirrus.com

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CS61880

DS450PP3

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.

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 + 100 ppm.

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.

Table 15. Transformer Specifications

Descriptions

Specifications

Turns Ratio Receive

1:2

Turns Ratio Transmit

1:1.15

Primary Inductance

1.5 mH min @ 1024 kHz

Primary Leakage Induc-

tance

0.3

µH max @ 1024 kHz

Secondary leakage Induc-

tance

0.4

µH max @ 1024 kHz

Inter winding Capacitance

18 pF max, primary to

secondary

ET-Constant

16 V -

µs min

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