TP3067WM/NOPB

Overview

The TP3067WM/NOPB is a monolithic PCM CODEC/Filter utilizing the A-law coding convention. It integrates transmit and receive filtering, an A-law encoder/decoder, and receive power amplifiers on a single CMOS chip. The device operates with dual ±5V supplies and supports serial PCM interfaces compatible with D3/D4 and CCITT standards. Key electrical parameters include a typical active supply current of 10 mA per rail, a power-down current of 1.5 mA, and a common-mode rejection ratio of 60 dB. The input offset voltage is specified at a maximum of 20 mV for the transmit amplifier.

Feature Summary

• Integrates complete CODEC and filtering system including transmit high-pass/low-pass filters and receive low-pass filter with sin x/x correction.
• Features internal precision voltage reference and auto-zero circuitry to maintain signal integrity.
• Includes receive push-pull power amplifiers capable of driving balanced loads directly.
• Supports both synchronous and asynchronous master clock operations with automatic frame sync detection.

Applications

• D3/D4 telephony applications
• CCITT standard communication systems
• PCM transmission equipment

Procurement Notes

Verify the component origin as Texas Instruments acquired National Semiconductor assets. Confirm the NOPB suffix indicates lead-free and RoHS compliance. Ensure the WQFN or DIP package matches the specific WM variant requirements for your board layout. Check for obsolescence status as this is a legacy component.

Selection Notes

Select the TP3067WM/NOPB when A-law encoding is required for international telecommunications standards. Choose this part over the TP3064 if μ-law compatibility is not needed. Consider the integrated power amplifiers for simplified line interface designs requiring balanced output drive without external components.

Part Context

This component belongs to the TP3064/TP3067 family of Enhanced Serial Interface CMOS CODEC/Filter Combos. These devices were originally developed by National Semiconductor before being acquired by Texas Instruments. They represent a specialized class of analog-digital conversion chips designed specifically for voice channel processing in telecom infrastructure.

Replacement Considerations

Publicly confirmed direct substitutes are not available in the provided documentation. The TP3064 serves as the functional equivalent for μ-law applications but requires software or protocol adaptation. No other specific replacement part numbers are verified in the source material.