CS61305A-IL1 Cirrus Logic, Inc., CS61305A-IL1 Datasheet - Page 26

• Manufacturer Part Number: CS61305A-IL1
• Description: T1/E1 line interface
• Manufacturer: Cirrus Logic, Inc.

Figures A2-A4 show a 0.47 F capacitor in series
with the transmit transformer primary. This ca-
pacitor 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.
Transformers
Recommended transmitter and receiver trans-
former specifications are shown in Table A2. The
transformers in Table A3 are recommended for
use with the CS61305A. Refer to the "Telecom
Transformer Selection Guide" for detailed sche-
matics which show how to connect the line
interface IC with a particular transformer.
26
Encoder/
Decoder
Monitor
Control
Format
Frame
&
XTL
RV+
+
28
12
11
10
1
5
7
6
8
3
4
2
9
68 F
RGND
CLKE
ACLKI
LOS
DPM
MODE
RPOS
RNEG
RCLK
TPOS
TNEG
TCLK
XTALIN
XTALOUT
Figure A2. T1 Host Mode Configuration
0.1
CS61305A
F
RGND
+5V
RV+
MODE
HOST
21
IN
22
TV+
TGND
15
14
MRING
RRING
TRING
SCLK
MTIP
RTIP
+
SDO
TTIP
SDI
INT
CS
1.0
Selecting an Oscillator Crystal
Specific crystal parameters are required for
proper operation of the jitter attenuator. It is rec-
ommended that the Crystal Semiconductor
CXT6176 crystal be used for T1 applications and
the CXT8192 crystal be used for E1 applications.
Line Protection
Secondary protection components can be added
to provide lightning surge and AC power-cross
immunity. Refer to the Application Note "Secon-
dary Line Protection for T1 and E1 Line Cards"
for detailed information on the different electrical
safety standards and specific application circuit
recommendations.
TGND
F
27
26
23
24
25
19
20
17
18
16
13
+5V
0.47
100 k
200
200
Serial
F
Port
P
1
3
5
2
6
PE-65351
PE-65388
2CT:1
1:1.15
2
6
1
5
RECEIVE
LINE
TRANSMIT
LINE
CS61305A
DS157PP3