TP3071N-G/NOPB

Overview

The TP3071N-G/NOPB is a COMBO II Programmable PCM CODEC/Filter designed for digital switching applications on subscriber line and trunk cards. It integrates transmit bandpass and receive lowpass channel filters with A-law and µ-law selectable companding PCM encoder and decoder functions. The device supports a serial PCM interface clocked up to 4.096 MHz and features programmable channel gains over a 25.4 dB range in both directions. It includes a programmable hybrid balancing filter capable of achieving cancellation exceeding 30 dB against standard test termination networks. The TP3071 provides five programmable interface latches for SLIC control, operates on ±5V supplies, and consumes 80 mW typically.

Feature Summary

• Integrates switched-capacitor transmit and receive filters with A-law or µ-law companding PCM encoding and decoding.
• Features programmable hybrid balance cancellation filter to adjust for various loop impedance conditions.
• Includes five individually configurable interface latches for direct solid-state SLIC control.
• Supports time-slot assignment for up to 64 slots per frame via internal counters.

Applications

• Digital switching applications on subscriber line cards
• Trunk card implementations
• Interfaces requiring transformer or active SLIC connection

Procurement Notes

Verify the specific ordering suffix and temperature grade when sourcing. Confirm that the component matches the original National Semiconductor specifications if replacing legacy inventory. Ensure the package type aligns with the PCB footprint requirements for the target design.

Selection Notes

Select the TP3071 when only one serial PCM port (DX0/DR0) is required. Choose this model over the TP3070 if the application does not need dual-port space switching capabilities. Verify that the system timing supports the non-delayed data mode or implements delayed data timing for time-slot assignment.

Part Context

The TP3071 is part of the second-generation COMBO II family, which combines CODEC and filtering functions into a single monolithic circuit. This integration reduces component count compared to first-generation discrete solutions. The device is optimized for telecommunications environments requiring high reliability and precise signal processing for voice channels.

Replacement Considerations

The TP3071N is functionally compatible with the TP3071J. Both belong to the same COMBO II family. Verify pinout compatibility and thermal performance differences between the PDIP and SOIC packages before substitution.