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CPC5710N Datasheet(PDF) 7 Page - Clare, Inc.

Part # CPC5710N
Description  Phone Line Monitor (PLM) IC
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Manufacturer  CLARE [Clare, Inc.]
Direct Link  http://www.clare.com
Logo CLARE - Clare, Inc.

CPC5710N Datasheet(HTML) 7 Page - Clare, Inc.

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CPC5710N
R02
www.clare.com
7
3. Applications
3.1 Line-In-Use (LIU) and Line Polarity Detector
This circuit performs two phone line interface
functions, LIU and line polarity detection. The LIU
output is logic high if the tip to ring voltage is less than
approximately 17V. This will occur whenever a parallel
device on the line such as a telephone or FAX is taken
off hook. This circuit can also be used to detect for the
presence or loss of battery.
The Polarity output indicates the polarity of the phone
line. Whenever tip is positive with respect to ring,
Polarity out will be a logic high.
Figure 5. LIU and Polarity Detection Application Circuit
+V
+V
U1 CPC5710
LIU
Polarity
R1-4
8.06M
1%
1206
R5
604K
R17
4.7M
R15
10K
R14
4.7M
R16
10K
R6
4.7M
TIP
RING
Unless noted otherwise:
All resistors 1%, 1/16 W.
All capacitors 16 V 10%.
Switch shown
in Linear Mode
IN+
IN-
VDD
VDD
VDD
VSS
LINOUT+
+
+
-
-
-
+
1.625 V
1.25 V
2V
0V
A=6
V
3
6
7
1
2
5
4
GND
8
GND
+
-
+
-
VDD
50k
R1
R2
R3
R4
R9
499K
R13
20K
R12
20K
R11
499K
R8
20K
+V
1/4 U2
LM339
IN-
IN+
OUT
+V
1/4 U2
LM339
IN-
IN+
OUT
+V
1/4 U2
LM339
IN-
IN+
OUT
+V
R10
21K
R7
21K
C1
1nF
LIN/CMP
CMPOUT
LINOUT-


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