TP3057ADW

Codecs Overview

The TP3057ADW is a monolithic serial interface PCM codec and filter manufactured by Texas Instruments. It integrates an A-law coder/decoder, transmit high-pass and low-pass filters, and a receive low-pass filter with (sin x)/x correction. The device operates on dual ±5 V supplies and features a TTL- or CMOS-compatible serial I/O interface. It supports master clock frequencies of 1.536 MHz, 1.544 MHz, or 2.048 MHz and bit clocks ranging from 64 kHz to 2.048 MHz. Packaged in a 16-pin SOIC (DW) format, it is characterized for operation between 0°C and 70°C.

Codecs Feature Summary

• Integrates complete PCM codec and filtering functions including transmit band-pass and receive low-pass filtering with (sin x)/x correction.
• Features patented circuitry designed to achieve low transmit channel idle noise specifically for A-law encoding applications.
• Includes internal autozero circuitry and a precision voltage reference to maintain signal integrity without external components.
• Supports both synchronous and asynchronous serial timing modes with automatic compensation for T1 frame structures.

Codecs Applications

• Line interface for digital transmission and switching of T1 carrier systems
• Subscriber line concentrators in PABX and central office telephone systems
• Digital voice-band data-storage systems

Codecs Procurement Notes

Verify the specific revision suffix against the datasheet SCTS026C to confirm the package type and temperature range. Confirm that the component matches the original National Semiconductor design lineage if cross-referencing legacy documentation. Ensure supply voltages strictly adhere to the ±5V specification during testing.

Codecs Selection Notes

Select the TP3057ADW when A-law encoding is required for full-duplex voice circuits interfacing with TDM systems. Choose this model over the TP3054A variant specifically for applications requiring A-law compatibility rather than μ-law. Verify that the operating environment remains within the 0°C to 70°C commercial temperature range defined for the 'A' suffix devices.

Codecs Part Context

This component belongs to the Enhanced Serial Interface CODEC/Filter COMBO Family. It serves as an improved version of the National Semiconductor TP3057 and TP3057-X series. The device maintains pin-for-pin compatibility with these predecessor parts while offering updated performance characteristics for modern digital telephony implementations.

Codecs Replacement Considerations

The TP3057BDW is a documented equivalent part number within the same family. Both devices share identical functional descriptions and pinouts. Designers should verify that the replacement part meets the specific A-law requirements and packaging constraints of the original design.

Codecs FAQ

What is the difference between the TP3057A and TP3054A?

The TP3057A implements A-law encoding and decoding, whereas the TP3054A implements μ-law encoding and decoding. They are otherwise functionally similar regarding filtering and interface timing.

How does the device handle power-down?

Connecting MCLKR/PDN continuously high places the device in a power-down standby mode. In this state, nonessential circuitry is disabled, and outputs enter a high-impedance state to minimize power consumption.

Can the TP3057ADW operate with asynchronous clocks?

Yes, the device supports asynchronous operation where separate transmit and receive master clocks can be applied. However, for optimal performance, the datasheet recommends keeping the clocks synchronous.