Phone Line Monitor with Detectors (PLMD)
Features
•
CPC5712 Outputs:
•
Two Independent Programmable Level Detectors
with Programmable Hysteresis
•
Fixed-Level Polarity Detector with Hysteresis
•
Differential Linear Output
•
Minimum External Components
•
Excellent Common-Mode Rejection Ratio
(CMRR) > 55dB
•
Application circuits meet isolation requirements of
worldwide telephony standards
•
Worldwide telephone network compatibility
•
Single Supply Operation, 3.0V to 5.5V
•
High differential input impedance
•
Very low common-mode input impedance
•
Fixed Gain
•
TTL Compatible CMOS Logic Level outputs
•
Small SOP 16-Lead package
CPC5712
Description
The CPC5712 is a special purpose Phone Line
Monitor with Detectors (PLMD) integrated circuit that
is used in various high-voltage telephony applications
such as VoIP gateways and IP-PBXs. The device
monitors the TIP/RING potential through a
high-impedance divider (resistor isolation) to derive
two programmable signal level detects, polarity
information, and a scaled representation of the phone
line voltages. In use, the resistor divider and the high
input impedance of the CPC5712 make the circuit
practically undetectable on the line.
The two voltage-level detects are programmed with
external resistors, which gives the designer complete
freedom with respect to line voltage detection levels.
The level settings also have programmable hysteresis
to prevent false triggering conditions. Detection of
these levels allows the user to determine the condition
of the line.
This device can also be used in non-telephony
applications such as instrumentation and industrial
controls, especially when a low-level differential level
needs to be detected in the presence of a large
common-mode voltage.
Applications
•
VoIP Gateways, IP-PBX, xDSL
•
TIP/RING Monitoring
•
Line-In-Use Detection
•
Polarity Detection for Caller ID, Enhanced 911
•
Battery Detection, PSTN Check
•
Non-telephony voltage level detection applications
•
Instrumentation
•
Industrial Controls
Ordering Information
Part
CPC5712UTR
Description
PLMD, 16-Lead SOP (2000/Reel)
Figure 1
CPC5712 PLMD With Support Components
V+
1
V
CC
CPC5712
OUT+ 5
+ Analog Output
R
IN1
TIP
R
DIFF
RING
R
IN2
7
8
IN+
IN-
+
-
G=5
OUT - 6
- Analog Output
Polarity Output
Voltage
Level Detect 1
Voltage
Level Detect 2
POLARITY 4
OUT+
DET1 3
DET2 2
GND
16
15
14
V
REF
9
R1
V
L1
10
R2
V
H1
11
R3
V
L2
12
R4
V
H2
13
R5
Pb
RoHS
2002/95/EC
e
3
1
DS-CPC5712 - R01
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CLARE [ CLARE, INC. ]
