TP3057AN

Codecs Overview

The TP3057AN is a monolithic serial interface combined PCM codec and filter manufactured by Texas Instruments. It integrates A-law compatible coder/decoder, transmit high-pass and low-pass filtering, receive low-pass filtering with (sin x)/x correction, active RC noise filters, an internal precision voltage reference, and autozero circuitry. The device operates on dual ±5-V supplies with typical active power consumption of 50 mW and standby power of 3 mW. It features a TTL- or CMOS-compatible digital interface and supports master clock frequencies of 1.536 MHz, 1.544 MHz, or 2.048 MHz.

Codecs Feature Summary

• Integrates complete PCM codec functionality with A-law encoding and decoding alongside comprehensive analog line filtering for voice-band signals.
• Includes patented circuitry designed to achieve low transmit channel idle noise characteristics suitable for specific telephony applications.
• Features automatic power-down capability and internal sequencing logic to manage system startup and latch-up prevention.

Codecs Applications

• Line interface for digital transmission and switching in T1 carrier systems
• Subscriber line concentrators in PABX and central office telephone networks
• Digital-encryption systems requiring voiceband signal processing

Codecs Procurement Notes

Verify the exact suffix against official documentation, as ordering codes may indicate package variations or temperature ranges not explicitly detailed here. Confirm component status, as legacy PCM codecs often face obsolescence. Ensure supply voltages match the required ±5 V specification during integration.

Codecs Selection Notes

Select this component for full-duplex voice circuits interfacing with TDM systems requiring A-law compression. Verify that the application environment stays within the 0°C to 70°C operating range. Ensure the design accommodates the specific timing requirements for short-frame and long-frame synchronization pulses.

Codecs Part Context

This part belongs to the TP305xA family, which includes the TP3054A (μ-law) and TP3057A (A-law). The 'N' suffix typically denotes a plastic DIP package variant. These devices are improved versions of earlier National Semiconductor models and serve as pin-for-pin replacements for legacy designs.

Codecs Replacement Considerations

Public confirmed substitute part numbers: TP3057ADW, TP3057ANR, TP13057AN, TP13057ADW.

Codecs FAQ

What is the difference between the TP3054A and TP3057A?

The TP3054A utilizes μ-law compression, while the TP3057A uses A-law compression. Additionally, the TP3057A includes patented circuitry for lower transmit channel idle noise.

How does the device handle power-down?

Connecting MCLKR/PDN continuously high powers down the device, reducing typical power consumption to 3 mW. Internal sequencing ensures safe startup and shutdown sequences.

Can the TP3057AN operate with asynchronous clocks?

Yes, it supports asynchronous operation where separate transmit and receive master clocks can be applied, though synchronous operation is recommended for best performance.