General description
The PCD3316 is a low power mixed signal CMOS integrated circuit for receiving physical layer signals like Bellcore’s ‘CPE1 Alerting Signal (CAS)’ and the signals used in similar services. The device is capable of a very high precision detection of the dual tone (2130 and 2750 Hz) by using a patented digital algorithm. The PCD3316 can be used for on-hook and off-hook Caller-ID (CID), Caller-ID on Call Waiting (CIDCW) and Caller-Name (CNAM) applications.

Features
■ Bellcore’s ‘CPE Alerting Signal (CAS)’ and British Telecom’s (BT) ‘Loop State Tone Alert Signal’ detection
■ BT’s ‘Idle State Tone Alert Signal’ by means of monitoring the input signal level
■ 1200 baud FSK demodulator conform Bell 202 and CCITT V23 standards
■ Ring or polarity change detector
■ Ring period measurement
■ Low battery comparator
■ Signal level detector
■ On-hook and off-hook applications according to Bellcore TR-NWT-000030 and SR-TSV-002476 specifications
■ Receive sensitivity of −37.8 dBm (in 600 Ω) for CAS
■ 2.5 to 3.6 V supply; low power standby mode
■ Selectable 1 second or 1 minute timebase interrupt
■ 3.58 MHz and 32.768 kHz crystal oscillators
■ SO16 package.

Applications
■ Analog Display Services Interface (ADSI) phones
■ Feature phones and adjunct boxes with Bellcore CID, CIDCW and CNAM systems
■ Computer Telephony Integrated (CTI) systems.