CS61577 Datasheet, PDF (37/44 Pages) Cirrus Logic – T1/E1 LINE INTERFACE

LINE INTERFACE EVALUATION BOARD
TRANSFORMER
(Turns Ratio)^1,2
PE-65351 (1:2CT)
Schott 12930 (1:2CT)
PE-65388 (1:1.15)
Schott 12931 (1:1.15)
PE-65389 (1:1:1.26)
Schott 12932 (1:1:1.26)
PE-64951 (dual 1:2CT)
Schott 11509 (dual 1:2CT)
PE-65565 (dual 1:1.15 & 1:2CT)
Schott 12531 (dual 1:1.15 & 1:2CT)
PE-65566 (dual 1:1:1.26 & 1:2CT)
Schott 12532 (dual 1:1:1.26 & 1:2CT)
LINE INTERFACE UNIT
’34
’35
’35A
’58
’58A ’74,’77 ’74A
’75
’304A,
’305A
RX TX RX TX RX TX RX TX RX TX RX TX RX TX RX TX RX TX
ADADA
ADA
ADA
A
A
BCBCB
BCB
BCB
B
B
D³
D³
D³
D³
D^3,5
C³
C³
C³
C³
C^3,5
D⁴
D⁴
D⁴
D⁴
D^4,5
C⁴
C⁴
C⁴
C⁴
C^4,5
E
E
E
E
E
E
E
E
E³
E³
E³
E³
E^3,5
E³
E³
E³
E³
E^3,5
E⁴
E⁴
E⁴
E⁴
E^4,5
E⁴
E⁴
E⁴
E⁴
E^4,5
NOTES:
1. A letter at the intersection of a row and column in Table 2 indicates
that the selected transformer is supported for use with the device.
The transformer is installed in the evaluation board with pin 1 po-
T2
T2
sitioned to match the letter illustrated in the drawing to the left.
B
D
A
2. The receive transformer (RX) is soldered at location T2 on the
evaluation board and is used for all applications. The transmit
transformer (TX) is socketed at location T1 on the evaluation
board and may be changed according to the application.
3. For use in 100Ω T1 twisted-pair applications only.
4. For use in 75Ω and 120Ω E1 applications only. Place jumper JP5
in position F-F for 75Ω E1 applications requiring a 1:1 turns ratio.
C
T1
5. Transmitter return loss improves when using a 1:2 turns ratio trans-
E
former with the appropriate transmit resistors.
T1
Table 2. Transformer Applications
DS40DB3
37