MT88E45
Description
Data Sheet
The MT88E45B is a low power CMOS integrated circuit suitable for receiving the physical layer signals used in
North American (Bellcore) Calling Identity Delivery on Call Waiting (CIDCW) and Calling Identity Delivery (CID)
services. It is also suitable for ETSI and BT Calling Line Identity Presentation (CLIP) and CLIP with Call Waiting
services.
The MT88E45B contains a 1200 baud Bell 202/CCITT V.23 FSK demodulator and a CAS/DT-AS detector. Two
input op-amps allow the MT88E45B to be connected to both Tip/Ring and the telephone hybrid or speech IC
receive pair for optimal CIDCW telephone architectural implementation. FSK demodulation is always on Tip/Ring,
while CAS detection can be on Tip/Ring or Hybrid Receive. Tip/Ring CAS detection is required for the Bellcore/TIA
Multiple Extension Interworking (MEI) and BT’s on-hook CLIP. A selectable FSK data interface allows the data to be
processed as a bit stream or extracted from a 1 byte on chip buffer. Power management has been incorporated to
power down the FSK or CAS section when not required. Full chip power down is also available. The MT88E45B is
suitable for applications using a fixed power source (with a +/-10% variation) between 3 and 5 V.
2
Zarlink Semiconductor Inc.
ZARLINK [ ZARLINK SEMICONDUCTOR INC ]
