XRT5997 Datasheet, PDF (26/37 Pages) Exar Corporation – Seven-Channel E1 Line Interface Unit

XRT5997
RxPOS_1
RxNEG_1
Loss of Signal - 1
U1
1
RxPOS_1
2
RxNEG_1
7
RTIP_1
R1
30.1
100
RxLOS_1
8
RRing_1
1 ^1:2 5
4
8
PE-65835
RTIP_1
RRing_1
XRT5997
Figure 8. Recommended Schematic for Interfacing the Receive Sections of the XRT5997
Device to the Line for 120Ω Applications (Transformer-Coupling)
Note:
Figures 7 and 8 indicate that the user should use a “2:1
STEP-DOWN” transformer, when interfacing the
receiver to the line.
Transmit Transformer Recommendations
Parameter
Value
Turns Ratio
1:2
Primary Inductance
Isolation Voltage
Leakage Inductance
The following Transformers are Recommended for Use
Part Number
Vendor
Isolation
PE-65835
Pulse
TTI 7154-R
Transpower Technologies, Inc.
TG26-1205
HALO
Note: More transformers will be added to this list as we
take the time to evaluate these transformers.
Package Type
Rev. 1.0.0
26