TP3054N/NOPB

Codecs Overview

The TP3054N/NOPB is a monolithic PCM CODEC and filter utilizing the mu-law encoding format. It integrates an input gain amplifier, active RC pre-filter, switched-capacitor band-pass filter (rejecting signals below 200 Hz and above 3400 Hz), auto-zero circuitry, and a companding coder. The decode section includes an expanding decoder, low-pass filter for sin x/x correction, and a power amplifier capable of driving 600-ohm loads to 7.2 dBm. It operates on dual +/-5V supplies with typical active power consumption of 50 mW and standby power of 3 mW.

Codecs Feature Summary

• Complete CODEC and filtering system including transmit high-pass/low-pass filtering, receive low-pass filter with sin x/x correction, and internal precision voltage reference.
• Supports D3/D4 and CCITT applications with TTL or CMOS compatible digital interfaces.
• Features automatic power-down capability and low operating power consumption.

Codecs Applications

• D3/D4 telephony systems
• CCITT standard communication applications

Codecs Procurement Notes

Verify the component manufacturer origin, as the datasheet indicates National Semiconductor design heritage now managed by Texas Instruments. Confirm that the 'NOPB' suffix denotes lead-free and RoHS compliance status according to current manufacturer specifications. Ensure the package type matches the required Dual-In-Line configuration for the specific application board layout.

Codecs Selection Notes

Select the TP3054N/NOPB specifically when mu-law encoding is required for the serial PCM interface. For A-law encoding requirements, the TP3057 variant must be used instead. Verify that the application supports the necessary master clock frequencies of 1.536 MHz, 1.544 MHz, or 2.048 MHz for proper synchronous or asynchronous operation.

Codecs Part Context

This device belongs to the Enhanced Serial Interface CODEC/Filter COMBO Family, which also includes the TP3057. Both devices share identical architectural features and pinouts but differ in their companding coding conventions. The family utilizes advanced double-poly CMOS process technology to maximize line interface card circuit density.

Codecs Replacement Considerations

TP3057N/NOPB: Functional substitute requiring only a change in encoding format from mu-law to A-law.

Codecs FAQ

How does the device handle power-down states?

The device enters power-down via the MCLK R/PDN pin held high or by holding FS X and FSR inputs continuously low. Power-up occurs upon the first FS X or FSR pulse after initialization.

What are the supported frame sync pulse modes?

The device supports both short frame sync pulses (one bit clock period) and long frame sync pulses (three or more bit clock periods). Short mode is the default upon power initialization.

Can the master clocks be asynchronous?

Yes, separate transmit and receive master clocks may be applied asynchronously. However, best performance is realized when they are synchronous, which can be achieved by connecting MCLK R/PDN statically.