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.

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

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