CS61574A-IL1 Cirrus Logic Inc, CS61574A-IL1 Datasheet - Page 28

• Manufacturer Part Number: CS61574A-IL1
• Description: Network Controller & Processor ICs IC T1/E1 Ln Intrfc Unit F/Strtum-4 apps
• Manufacturer: Cirrus Logic Inc

Specifications of CS61574A-IL1

• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Package / Case: PLCC-28
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

APPLICATIONS
Line Interface
Figures A1-A3 show typical T1 and E1 line inter-
face application circuits. Table A1 shows the
external components which are specific to each
application. Figure A1 illustrates a T1 interface in
the Host Mode. Figure A2 illustrates a 120 Ω E1
interface in the Hardware Mode. Figure A3 illus-
trates a 75 Ω E1 interface in the Extended
Hardware Mode
The receiver transformer has a grounded center
tap on the IC side. Resistors between the RTIP
28
Frequency
1.544 (T1)
2.048 (E1)
MHz
μ
Figure A1. T1 Host Mode Configuration
Table A1. External Component Values
Cable
100
120
75
Ω
μ
CS61574A
CS61575
MODE
HOST
OR
IN
R1 and R2
200
240
150
Ω
and RRING pins to ground provide the termina-
tion for the receive line.
The transmitter transformer matches the 75 Ω
transmitter output impedance to the line imped-
ance. Figures A1-A3 show a 0.47 μF capacitor in
series with the transmit transformer primary. This
capacitor is needed to prevent any output stage
imbalance from resulting in a DC current through
the transformer primary. This current might satu-
rate the transformer producing an output offset
level shift.
Transformer
Transmit
μ
1:1.15
1:1.26
1:1
μ
Ω
6.176 MHz
8.192 MHz
μ
Crystal
XTL
CS61574A CS61575
DS154F3