TP3067WM

Overview

The TP3067WM is a monolithic PCM CODEC/Filter COMBO utilizing A-law coding, fabricated using National Semiconductor’s advanced double-poly CMOS process. It integrates transmit and receive filtering, an A-law encoder/decoder, and receive power amplifiers for balanced output drive. The device operates on ±5V supplies with typical active power consumption of 70 mW and standby power of 3 mW. It supports serial PCM interfaces compatible with D3/D4 and CCITT standards, featuring TTL or CMOS digital interface compatibility.

Feature Summary

• Integrated complete CODEC and filtering system including transmit high-pass/low-pass filtering and receive low-pass filter with sin x/x correction.
• Includes internal precision voltage reference and auto-zero circuitry for signal integrity.
• Features receive push-pull power amplifiers providing balanced output drive capability.
• Supports both synchronous and asynchronous master clock operations.

Applications

• D3/D4 telephony applications
• CCITT standard communication systems
• PCM codec line interface cards

Procurement Notes

Verify the specific suffix 'WM' corresponds to the Plastic Chip Carrier package (NS Package M20B) as documented in the datasheet connection diagrams. Confirm that the component source aligns with the original National Semiconductor specifications, noting that Texas Instruments acquired the relevant assets. Ensure the revision level matches SNAS570 requirements for timing and electrical characteristics.

Selection Notes

Select the TP3067WM specifically for A-law encoding requirements, distinguishing it from the TP3064 which utilizes µ-law. Ensure the application design accommodates the ±5V supply rails and provides appropriate decoupling capacitors near VCC and VBB pins. Verify that the external resistor network for gain adjustment meets the impedance requirements for the desired output levels across the 600 Ω load.

Part Context

This component belongs to the TP3064/TP3067 Enhanced Serial Interface CMOS CODEC/Filter COMBO family. It is functionally similar to the TP305X series but includes additional receive power amplifier capabilities. The device was originally manufactured by National Semiconductor before asset transfers occurred within the semiconductor industry.

Replacement Considerations

The TP3064 serves as the functional equivalent for µ-law applications within the same package and pinout configuration. Other members of the TP305X family offer similar core functionalities but may lack the integrated receive power amplifiers found in this specific COMBO variant.