CS61584-IL5 Cirrus Logic, Inc., CS61584-IL5 Datasheet - Page 48

• Manufacturer Part Number: CS61584-IL5
• Description: Dual T1/E1 line interface 3.3V
• Manufacturer: Cirrus Logic, Inc.

13. APPLICATIONS
13.1 Line Interface
Figures 27-29 illustrate typical connection diagram
for T1 and E1 line interface circuits in Hardware,
Host serial port, and Host parallel port modes. Ta-
ble 13 lists the external components that are re-
quired in T1 and E1 applications for both the 5.0
and 3.3 Volt devices.
In the transmit line interface circuitry, capacitors
C1 and C2 provide transmitter return loss. The
0.47 µF capacitor in series with the transformer pri-
48
-IL3 and -IQ3 (3.3 Volts)
-IL5 and -IQ5 (5.0 Volts)
Framer
Framer
Device Suffix
V
CC
REFCLK 1XCLK
Clock Generator
TPOS2
RPOS1
RNEG1
RPOS2
RNEG2
TCLK1
RCLK1
TCLK2
TNEG2
RCLK2
TPOS1
TNEG1
AV+
0.1 F
+
1 F
AGND BGREF
MODE
R3
4.99k
Data Rate
(MHz)
RESET
TGND2
1.544
2.048
1.544
2.048
0.1 F
PD[1:2]
2
Figure 27. Hardware Mode Configuration
Table 13. CS61584A External Components
TV+2
CLKE
TV+1
REFCLK Frequency (MHz)
1XCLK = 1
Hardware Control
0.1 F
22 F
ATTEN[0:1]
Power Supply
+
1.544
2.048
1.544
2.048
2
Channel 1
Channel 2
TGND1
DS261PP5
RLOOP[1:2] LLOOP
2
RGND2
0.1 F
mary prevents output stage imbalances from pro-
ducing a DC current through the transformer that
might saturate the transformer and result in an out-
put level offset.
In the receive line interface circuitry, resistors R1-
R4 provide receive impedance matching and re-
ceiver return loss. The 0.47 µF capacitor to ground
provides the necessary differential input voltage
reference for the receiver.
1XCLK = 0
12.352
16.384
12.352
16.384
RV+2
TAOS[1:2]
2
RV+1 RGND1 DV+ DGND1:3
0.1 F
CON[0:2]1 CON[0:2]2
3
Transformer
Turns Ratio
1:1.15
1:2
3
0.01 F
RRING1
RRING2
TRING1
TRING2
RTIP1
RTIP2
LOS[1:2]
TTIP1
TTIP2
2
3
Cable
0.47 F
0.47 F
R1
R2
R3
R4
100
120
100
120
( )
75
75
0.47 F
0.47 F
CS61584A
C1
C2
R1-R4
12.4
9.31
15.0
38.3
28.7
45.3
T1
T2
T3
T4
( )
DS261PP5
1:N
1:N
1:N
1:N
C1-C2
receive
receive
transmit
transmit
2200
(pF)
560
220
470
560
220