MC145422数据手册恩XP中文资料规格书

描述 Description

Overview The MC145422 has been discontinued. Suggested replacement: MC145423.The MC145422 and MC145426 UDLTs are high-speed data transceivers that provide 80 kbps full-duplex data communication over 26 AWG and larger twisted-pair cable up to two kilometers in distance. Intended primarily for use in digital subscriber voice/data telephone systems, these devices can also be used in remote data acquisition and control systems. These devices utilize a 256 kilobaud modified differential phase shift keying burst modulation technique for transmission to minimize RFI/ EMI and crosstalk. Simultaneous power distribution and duplex data communication can be obtained using a single twisted-pair wire. These devices are designed for compatibility with existing, as well as evolving, telephone switching hardware and software architectures. The UDLT chip-set consists of the MC145422 Master UDLT for use at the telephone switch linecard and the MC145426 Slave UDLT for use at the remote digital telset and/or data terminal. The devices employ CMOS technology in order to take advantage of their reliable low-power operation and proven capability for complex analog/digital LSI functions.  

特性 Features

•Provides Full-Duplex Synchronous 64 kpbs Voice/Data Channel
and Two 8 kbps Signaling Data Channels Over One 26 AWG Wire Pair
Up to Two Kilometers
•Compatible with Existing and Evolving Telephone Switch
Architectures and Call Signaling Schemes
•Automatic Detection Threshold Adjustment for Optimum
Performance Over Varying Signal Attenuations
•Protocol Independent
•Single 5 V Power Supply
•22-Pin PDIP, 24-Pin SOG Packages
•Application Notes AN943, AN949, AN968, AN946, and AN948

MC145422 Master UDLT

•Pin Controlled Power-Down and Loopback
•Signaling and Control I/O Capable of Sharing Common Bus Wiring
with Other UDLTs
•Variable Data Clock -- 64 kHz to 2.56 MHz
•Pin Controlled Insertion/Extraction of 8 kbps Channel into LSB
of 64 kbps Channel for Simultaneous Routing of Voice and Data
Through PCM Voice Path of Telephone Switch