AD1970JSTZ

Overview

The AD1970JSTZ is a digital BTSC encoder with integrated stereo ADC and DAC, designed for US television audio systems. It digitizes analog baseband audio or accepts digital input to generate a composite signal compatible with 4.5 MHz FM modulators. The device features a 24-bit resolution, 3.3 V single supply operation, and an I²C control port. Key performance metrics include 87 dB dynamic range and -83 dB THD+N for digital inputs, and 74 dB dynamic range with -72 dB THD+N for analog inputs. It operates within a 0°C to 70°C temperature range and utilizes a 48-pin LQFP package.

Feature Summary

• Complete BTSC encoding with pilot tone generation and subcarrier modulation
• Integrated stereo ADC and high-performance DAC for analog or digital input processing
• Phat-Stereo algorithm for image enhancement and dialog enhancement function
• Flexible clocking via integrated PLL or external master clock input

Applications

• Digital set top boxes
• DVD players
• DVD recorders

Procurement Notes

Verify component status as the AD1970 series is marked obsolete in official documentation. Confirm availability through authorized distributors or secondary market suppliers. Ensure compatibility with existing system designs requiring BTSC encoding capabilities before procurement.

Selection Notes

Select this component for applications requiring standard US BTSC audio encoding. Consider the integrated nature of the ADC/DAC and PLL to reduce external component count. Verify interface compatibility with source digital audio formats and downstream FM modulator requirements.

Part Context

Analog Devices developed the AD1970 to provide a complete solution for adding stereo audio capability to the US television system. Licensed from THAT Corporation, it implements patented BTSC technology. The device simplifies design by integrating necessary signal processing, filtering, and modulation functions into a single monolithic IC.

Replacement Considerations

No direct public substitute part numbers are confirmed in the provided documentation. As the AD1970 is obsolete, alternative solutions may require redesigning the audio processing stage or utilizing discrete components to replicate BTSC encoding functions.