XRT5997 Datasheet, PDF (23/37 Pages) Exar Corporation – Seven-Channel E1 Line Interface Unit

XRT5997
TxPOS_1
TxNEG_1
TxLineClk_1
U1
99
TxPOS_1
98
TxNEG_1
97
TxCLK_1
95
TTIP_1
1
R1
2
9.1
93
TRING_1
1
R2
2
9.1
1 ^1:2 5
4
8
PE-65835
J1
BNC
1
XRT5997
Figure 5. Illustration of how to interface the Transmit Sections of the
XRT5997 device to the Line (for “75Ω ” Applications)
TxPOS_1
TxNEG_1
TxLineClk_1
U1
99
TxPOS_1
98
TxNEG_1
97
TxClk_1
95
TTIP_1
1 ^R1 2
9.1
93
TRing_1
1 ^R2 2
9.1
1 ^1:2 5
4
8
PE-65835
TTIP_Channel_1
TRing_Channel_1
XRT5997
Figure 6. Illustration of how to interface the Transmit Sections the
XRT5997 device to the Line (for “120Ω ” Applications)
Notes:
1. Figures 5 and 6, 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.
Rev. 1.0.0
23