參數(shù)資料
型號(hào): CS61577-IP1
廠商: CIRRUS LOGIC INC
元件分類: 數(shù)字傳輸電路
英文描述: T1/E1 LINE INTERFACE
中文描述: DATACOM, PCM TRANSCEIVER, PDIP28
封裝: PLASTIC, DIP-28
文件頁數(shù): 26/44頁
文件大?。?/td> 632K
代理商: CS61577-IP1
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
E1
interface in the Hardware Mode. Figure A3 illus-
trates a 75
E1 interface in the Extended
Hardware Mode.
The 1:2 receiver transformer has a grounded cen-
ter tap on the IC side. Resistors R1 and R2
between the RTIP and RRING pins to ground
provide the termination for the receive line. The
transmitter also uses a 1:2 transformer. A 0.47
μ
F
capacitor is required 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 saturate the transformer pro-
ducing an output offset level shift.
Control
&
Monitor
Frame
Format
Encoder/
Decoder
CS61577
IN
HOST
MODE
RECEIVE
LINE
TRANSMIT
LINE
28
1
12
11
5
7
6
8
3
4
2
9
10
XTL
RV+
+
68
μ
F
RGND
0.1
μ
F
+5V
21
15
+
1.0
μ
F
TGND
RV+
TV+
CLKE
ACLKI
LOS
DPM
MODE
RPOS
RNEG
RCLK
TPOS
TNEG
TCLK
XTALIN
XTALOUT
RGND
TGND
22
14
SCLK
CS
INT
SDI
SDO
RTIP
RRING
MTIP
MRING
TRING
TTIP
19
20
17
18
16
13
R1
R2
1
3
5
2
6
0.47
μ
F
2
6
1
5
1:2CT
PE-65351
2CT:1
PE-65351
μ
P
Serial
Port
27
26
23
24
25
+5V
100 k
Figure A1. T1 Host Mode Configuration
Frequency
MHz
1.544 (T1)
2.048 (E1)
Crystal
XTL
CXT6176
CXT8192
Cable
100
120
75
LEN2/1/0
R3
R1 and R2
200
240
150
0/1/1 - 1/1/1
0/0/0
0/0/0
0/0/1
not used
not used
4.4
not used
Table A1. External Component Values
CS61577
26
DS155PP2
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