OTTAWA, Ontario -- Mitel Semiconductor here is offering a new high-performance Caller ID chip that it said exceeds the benchmark performance specifications that define best-in-class reliability in Caller ID equipment.
Mitel's MT88E46A is a Caller ID (CID) and Caller ID on Call Waiting (CIDCW) receiver chip that is used in corded and cordless telephones, Internet phones, answering machines, caller ID adjuncts and computer telephony integration (CTI) systems.
Mitel was the first to integrate the CID and CIDCW functions on a single IC. "Mitel's leadership is based on applying mixed-signal technology to increase performance and reliability in caller ID equipment," said C.P. Fu, product manager for analog signal-processing components at Mitel Semiconductor. "Our new device is a low-cost, high reliability solution that enables telephone companies to offer hassle-free call-management services."
Human speech interferes with the ability of CIDCW equipment to properly detect or interpret the CPE Alerting Signal (CAS) of an incoming telephone call. When interference occurs, conversation is momentarily interrupted, or Caller ID information is not sent to the user. Caller ID circuits, therefore, must be "immune" to speech. Mitel exceeded Bellcore's (now Telcordia) speech immunity performance specifications by developing a patent-pending CAS detector.
The MT88E46A contains all of the circuitry required for a complete physical layer solution. This includes a Bellcore-compliant CAS detector, 1,200-baud Bell 202/CCITT V.23 frequency shift key (FSK) demodulator, and simple microcontroller interface. With two input op-amps, the MT88E46A allows connections to both Tip/Ring, and the telephone hybrid or speech IC receive pair, for optimal CIDCW implementation. The CAS detector significantly reduces false signal detection (a condition known as "talkoff") and signal non-detection ("talkdown") problems.
The device also incorporates power-management functions, including power-down for the FSK, CAS, or full-chip when required. The MT88E46A is suitable for applications using a fixed power source (with a 10% variation) between 3 and 5 volts. Mitel provides an evaluation kit and application note.
The MT88E46A is packaged in a 20-pin SOIC with tape and reel option. The device is now in full production. Pricing is $1.39 in 100,000-unit quantities.