TP3069N

Overview

The TP3069N is a monolithic PCM CODEC/Filter utilizing A-law encoding and decoding with a serial interface. It operates on ±5V supplies, consuming approximately 70 mW in active mode and 3 mW in standby. The device integrates transmit high-pass and low-pass filtering, receive low-pass filtering with sin x/x correction, and internal auto-zero circuitry. It features receive push-pull power amplifiers capable of driving balanced loads up to ±6.6V across 600Ω. Digital interfaces are compatible with TTL or CMOS standards.

Feature Summary

• Integrated CODEC system with A-law encoding and decoding
• Receive push-pull power amplifiers for balanced output drive
• Active RC noise filters and switched-capacitor bandpass filters
• TTL or CMOS compatible digital serial I/O interface

Applications

• D3/D4 telephony applications
• CCITT standard compliant systems
• Line interface card circuits

Procurement Notes

Verify the manufacturer origin as National Semiconductor, now part of Texas Instruments, due to corporate acquisitions. Confirm the package type corresponds to the N20A designation for the PDIP-20 configuration. Ensure compatibility with existing ±5V power supply designs and check for any specific pinout variations in legacy documentation versus current datasheets.

Selection Notes

Select this component for applications requiring integrated analog filtering and A-law conversion in a single package. Consider the synchronous or asynchronous clocking options based on system timing requirements. Evaluate the power-down functionality if energy efficiency is critical. Verify that the required output drive capability matches the balanced transformer specifications of the target line interface.

Part Context

The TP3069 belongs to the COMBO family of devices, which combine CODEC and filter functions. It is similar to the TP305X family but includes additional receive power amplifier capabilities. This integration reduces the component count for telephony line interface cards compared to discrete solutions.

Replacement Considerations

The TP3069J and TP3069V are alternative package versions of the same functional device. Cross-reference with the TP305X family for basic CODEC/filter functionality without the integrated power amplifiers if lower drive capability is sufficient.