CS61577 datasheet(28/44 Pages) ETC

28 / 44 page

Transformers

Recommended transmitter and receiver trans-

former specifications are shown in Table A2. The

transformers in Table A3 have been tested and

recommended for use with the CS61577. Refer to

the "Telecom Transformer Selection Guide" for

detailed schematics which show how to connect

the line interface IC with a particular transformer.

Selecting an Oscillator Crystal

Specific crystal parameters are required for

proper operation of the jitter attenuator. It is rec-

ommended that the Crystal Semiconductor

CXT6176 crystal be used for T1 applications and

the CXT8192 crystal be used for E1 applications.

Transmit Side Jitter Attenuation

In some applications it is desirable to attenuate

jitter from the signal to be transmitted. A

CS61577 in local loopback mode can be used as a

jitter attenuator. The inputs to the jitter attenuator

are TPOS, TNEG, TCLK. The outputs from the

jitter attenuator are RPOS, RNEG and RCLK.

Line Protection

Secondary protection components can be added

to provide lightning surge and AC power-cross

immunity. Refer to the "Telecom Line Protection

Application Note" for detailed information on the

different electrical safety standards and specific

application circuit recommendations.

Turns Ratio

1:2 CT

± 5%

Primary

Inductance

600

µH min. @ 772 kHz

Primary Leakage

Inductance

1.3

µH max. @ 772 kHz

Secondary Leakage

Inductance

0.4

µH max. @ 772 kHz

Interwinding

Capacitance

23 pF max.

ET-constant

16 V-

µs min. for T1

12 V-

µs min. for E1

Table A2. Transformer Specifications

Turns

Ratio(s)

Manufacturer

Part Number

Package Type

1:2CT

Pulse Engineering

PE-65351

1.5 kV through-hole, single

Schott

67129300

Bel Fuse

0553-0013-HC

dual

1:2CT

Pulse Engineering

PE-64951

1.5 kV through-hole, dual

Bel Fuse

0553-0013-1J

dual

1:2CT

Pulse Engineering

PE-65761

1.5 kVsurface-mount, dual

Bel Fuse

S553-0013-03

1:2CT

Pulse Engineering

PE-65835

3 kV through-hole, single

EN60950, EN41003 approved

Table A3. Recommended Transformers

CS61577

DS155PP2

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