CS61577-IL1Z データシートの表示（PDF） - Cirrus Logic
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CS61577-IL1Z Datasheet PDF : 30 Pages
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CS61577
#3
APPLICATIONS
+5V
+ 68 μF
0.1 μF
+ 1.0 μF +5V
Control
&
Monitor
Frame
Format
Encoder/
Decoder
XTL
RGND
28 CLKE
1 ACLKI
12 LOS
11 DPM
RV+
5
7
6
8
MODE
RPOS
RNEG
RCLK
3 TPOS
4 TNEG
2 TCLK
9 XTALIN
10 XTALOUT
21
RV+
15
TGND
TV+ SCLK 27
CS 26
INT 23
SDI 24
SDO 25
#3
).
(/34
-/$%
RTIP 19
RRING 20
MTIP 17
MRING 18
TRING 16
RGND TGND TTIP 13
22
14
100 kΩ
μP
Serial
Port
1
R1
3
R2
5
2
RECEIVE
6 LINE
2CT:1
PE-65351
0.47 μF
2
1
6
5
1:2CT
PE-65351
TRANSMIT
LINE
Figure A1. T1 Host Mode Configuration
Frequency
MHz
1.544 (T1)
2.048 (E1)
Crystal
XTL
6.176 MHz
8.192 MHz
Cable
Ω
100
120
75
LEN2/1/0
0/1/1 - 1/1/1
0/0/0
0/0/0
0/0/1
R3
Ω
not used
not used
4.4
not used
R1 and R2
Ω
200
240
150
Table A1. External Component Values
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 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 μF
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.
DS155F
$30025
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