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MC33121 - LOW VOLTAGE SUBSCRIBER LOOP INTERFACE CIRCUIT

Key Features

  • k RS 9.1 k RS 9.1 k RC 1.0 k 3 4 16 17 BP ST1 13 CP VDG VAG MC33121 RXI 14 TSI 9 IRXI 10 RRF 4.7 k RRO 20.3 k CRO 1.0 µF 1.0 µF +10.13 dB RRX 30.9 k 5 RSI.

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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MOTOROLA SEMICONDUCTOR TECHNICAL DATA Order this document by MC33121/D MC33121 Low Voltage Subscriber Loop Interface Circuit (SLIC) Thin Film Silicon Monolithic Integrated Circuit The MC33121 is designed to provide the interface between the 4–wire side of a central office, or PBX, and the 2–wire subscriber line. Interface functions include battery feed, proper loop termination AC impedance, hookswitch detection, adjustable transmit, receive, and transhybrid gains, and single/ double fault indication. Additionally, the MC33121 provides a minimum of 58 dB of longitudinal balance (4–wire and 2–wire). The transmit and receive signals are referenced to analog ground, while digital signals are referenced to digital ground, easing the interface to codecs, filters, etc.