MC44C401LAC

Encoders, Decoders, Converters Overview

The MC44C401L is a single-chip CMOS Multi-Channel Television Sound (MTS) stereo encoder compatible with Broadcast Television Systems Committee (BTSC) standards. It processes left and right analog audio signals alongside baseband composite video to generate stereophonic composite signals for RF modulation. The device integrates sigma-delta ADCs and DACs, operating on a 12 MHz reference clock via an internal APLL. Key electrical parameters include a digital logic supply of 1.8 V and analog/digital output supplies of 3.3 V. Audio input levels are specified at 1.0 Vpp with 250 kΩ impedance, while the composite audio output reaches 2.2 Vpp. Performance metrics feature a signal-to-noise ratio of 75 dB and total harmonic distortion of 0.3%.

Encoders, Decoders, Converters Feature Summary

• Integrated Sigma-Delta Analog-to-Digital and Digital-to-Analog conversion circuitry
• CEX digital audio processing technology for stereo signal encoding and transport
• Compatibility with surround sound formats and Macrovision copy protection technologies
• Extended low-frequency response capability extending below 25 Hz

Encoders, Decoders, Converters Applications

• Set-top boxes requiring high-quality stereo sound output
• VCRs and DVD players/recorders with RF coaxial cable outputs
• Game stations needing BTSC-compatible stereo transmission
• Broadcast television systems utilizing Motorola RF modulators

Encoders, Decoders, Converters Procurement Notes

Verify the specific suffix 'AC' against official NXP documentation, as the provided datasheet references the standard 'MC44C401L'. Confirm package availability in 32TQFP format and ensure compatibility with 1.8 V digital logic and 3.3 V analog supply requirements during sourcing.

Encoders, Decoders, Converters Selection Notes

Select this component for applications requiring a single-chip solution for BTST MTS encoding. Ensure the design supports a 12 MHz crystal oscillator input and provides separate 1.8 V and 3.3 V power rails. Verify that the downstream RF modulator matches the passive interface specifications for simple integration without manual filter alignment.

Encoders, Decoders, Converters Part Context

Manufactured by Freescale Semiconductor, now part of NXP USA Inc., the MC44C401L represents an early CMOS implementation of BTSC stereo encoding. It consolidates functions previously requiring multiple discrete components, reducing board size and system cost. The device is designed specifically to interface with Motorola's MC44BC374 and MC44BC375 modulators for VHF/UHF channel generation.

Encoders, Decoders, Converters Replacement Considerations

Public confirmed substitute part numbers are not available in the provided source material.