Littelfuse/IXYS CPC5712UTR

The CPC5712 is a special purpose Voltage Monitor with Detectors 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.

• 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-Pin package

• 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