TP3071N-G

Overview

The TP3071N-G 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 encoders and decoders. The device features a serial PCM interface clocked up to 4.096 MHz, programmable gains over a 25.4 dB range in 0.1 dB steps, and a hybrid balancing filter for loop impedance compensation. It includes five programmable interface latches for SLIC control and operates on dual ±5V supplies with typical power consumption of 80 mW.

Feature Summary

• Integrates switched-capacitor channel filters with A-law or µ-law companding encoding and decoding
• Features programmable transmit and receive gain controls with 0.1 dB resolution
• Includes a hybrid balance cancellation filter for transformer and active SLIC interfaces
• Provides five programmable interface latches for direct solid-state SLIC control

Applications

• Digital switching systems on subscriber line cards
• Trunk card implementations in telecommunications networks
• Interfaces requiring CCITT and LSSGR compliance

Procurement Notes

Verify the specific suffix 'N-G' against the manufacturer's official documentation to confirm package type and temperature rating. Ensure the component source matches National Semiconductor specifications, as this part number originates from that manufacturer rather than Texas Instruments.

Selection Notes

Select the TP3071N-G when five interface latches are sufficient for system control requirements. This model supports single-port operation via DX0 and DR0 pins, unlike the two-port TP3070 variant. Confirm compatibility with the required master clock frequencies and coding laws during the design phase.

Part Context

The TP3071 belongs to the COMBO II family of second-generation PCM CODECs developed by National Semiconductor. It serves as a specialized audio processing solution for traditional telephony infrastructure, offering integrated filtering and coding capabilities to reduce external component counts in switching equipment designs.

Replacement Considerations

The TP3070 is a compatible alternative within the same family but provides six interface latches and dual-port support (DX0/DX1). Verify if the additional latch or port functionality is required before substituting.