Description
The Clare CPC5710N is a selectable dual function CMOS special purpose integrated high-impedance input, fixed-gain amplifier and an internally set voltage level comparator for telephone line monitoring. The high (>40dB) common-mode rejection ratio makes the CPC5710N an excellent choice for signaling detection, line condition monitoring, discrete voice recording and CID buffering applications. In addition to voice applications, the CPC5710N is ideal for data applications such as embedded modem designs utilized in broadband set-top boxes.

Features
• Excellent common-mode rejection ratio (CMRR)
• Application circuits can meet isolation requirements of worldwide telephony standards
• Small 8-pin SOIC
• Worldwide telephone network compatibility
• Full-wave ringing level detector comparator with internal threshold, large hysteresis, and logic-level output
• 3.3V or 5V operation
• High differential input impedance
• Very low common-mode input impedance
• Fixed gain
• Differential or single-ended linear output
• TTL logic level input
• CMOS logic level output (TTL compatible)
• Virtually non-detectable in voice monitoring applications

Applications
• The CPC5710N can be used for line monitoring or detection of signaling states and loop conditions such as:
    • Display feature (caller ID) signal buffering
    • Line-In-Use (LIU) detection
    • Ringing signal with adjustable detection level
    • Battery presence monitoring
    • Tip to ring line voltage monitoring
    • Line polarity
    • Imperceptible voice recording