AD1939YSTZ

Overview

The AD1939YSTZ is a high-performance, single-chip audio codec manufactured by Analog Devices Inc. It integrates four analog-to-digital converters (ADCs) with differential inputs and eight digital-to-analog converters (DACs) with differential outputs, utilizing a patented multibit sigma-delta architecture. The device supports sample rates from 8 kHz to 192 kHz at a 24-bit resolution. Key electrical specifications include a DAC dynamic range of 112 dB and an ADC dynamic range of 107 dB. It operates on a single 3.3 V supply for both digital and analog sections, features tolerance for 5 V logic inputs, and includes an on-chip PLL for clock generation. The component is housed in a 64-lead LQFP package.

Feature Summary

• Integrates four differential-input ADCs and eight differential-output DACs using multibit sigma-delta architecture.
• Features an on-chip phase-locked loop (PLL) to generate master clocks from LRCLK or external crystals, eliminating the need for separate high-frequency oscillators.
• Designed for low electromagnetic interference (EMI) through continuous-time architectures and optimized power supply usage.
• Includes software-controllable clickless mute, log volume control with autoramp, and SPI interface for parameter adjustment.

Applications

• Automotive audio systems
• Home theater systems
• Set-top boxes
• Digital audio effects processors

Procurement Notes

Verify that the specific part number matches the required package type and output configuration. Confirm that the ordering suffix corresponds to the intended tape-and-reel quantity if applicable. Ensure compatibility with the system's voltage levels and clocking requirements before finalizing procurement decisions.

Selection Notes

Select this component when differential audio outputs are required for improved noise performance. Verify that the system can accommodate the 64-lead LQFP footprint. Ensure the design supports the necessary 3.3 V supply rails and provides adequate filtering for the common-mode reference pins to maintain specified dynamic range and distortion metrics.

Part Context

The AD1939 belongs to the AD193X family of codecs, which also includes variants like the AD1938 and AD1939XSTZ. While sharing similar core functionalities, differences exist in package lead counts and output configurations. The AD1939 specifically utilizes a 64-lead LQFP package to support its differential DAC outputs, distinguishing it from single-ended output versions within the same product family.

Replacement Considerations

The AD1939WBSTZ-RL is documented as a direct substitute for the AD1939YSTZRL variant. Verify pinout compatibility and functional equivalence before implementing any cross-model replacements in existing designs.