XRT59L921 datasheet(21/32 Pages) EXAR

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XRT59L921

REV. 1.2.1

TWENTY-ONE CHANNEL E1 LINE INTERFACE UNIT

NOTES:

Figure 7 and Figure 8, indicate that for both 75Ω and 120Ω applications, the user should connect a 9.1Ω

resistor, in series, between the TTIP/TRing outputs and the transformers.

2. Figure 5 and 6, indicate that the user should use a 1:2 STEP-UP Transformer.

FIGURE 7. ILLUSTRATION OF HOW TO INTERFACE THE TRANSMIT SECTIONS OF THE XRT59L921 TO THE LINE (FOR

Ω APPLICATIONS)

FIGURE 8. ILLUSTRATION OF HOW TO INTERFACE THE TRANSMIT SECTIONS THE XRT59L921 TO THE LINE (FOR

120

Ω APPLICATIONS)

TRANSMIT TRANSFORMER RECOMMENDATIONS

PARAMETER

VALUE

Turns Ratio

1:2

Primary Inductance

Isolation Voltage

Leakage Inductance

9.1

Ω

9.1

Ω

TxPOS_n

TxNEG_n

TxClk_n

XRT59L921

TxClk_n

TxPOS_n

TxNEG_n

TTIP_n

TRING_n

1:2

Coaxial cable

9.1

Ω

9.1

Ω

TxPOS_n

TxNEG_n

TxClk_n

XRT59L921

TxClk_n

TxPOS_n

TxNEG_n

TTIP_n

TRING_n

TRING_Channel_n

TTIP_Channel_n

1:2

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