**ADAU1328BSTZ: A Comprehensive Technical Overview of SigmaDSP's Low-Power, 8-Channel Audio Codec**
In the realm of professional audio, embedded systems, and multi-channel applications, achieving high-fidelity sound processing with minimal power consumption is a paramount challenge. The **ADAU1328BSTZ** from Analog Devices stands as a robust solution, integrating a **SigmaDSP® core** with a high-performance audio codec into a single, compact package. This device is engineered to deliver exceptional audio quality and flexible processing capabilities while operating at remarkably low power levels, making it an ideal choice for sophisticated audio systems.
At the heart of the ADAU1328BSTZ is a **fully programmable 28/56-bit SigmaDSP core**. This digital signal processor provides the computational muscle for implementing complex audio algorithms in real-time, including dynamic range compression, equalization, filtering, and advanced mixing. Unlike fixed-function codecs, the programmability of the SigmaDSP core allows designers to create custom audio processing flows tailored to specific application requirements, from automotive infotainment to home theater systems and professional mixing consoles.
The audio conversion capabilities are equally impressive. The device features **eight analog input channels and eight analog output channels**, all supporting sample rates from 8 kHz to 96 kHz. Each channel is serviced by a high-quality, **24-bit stereo ADC (Analog-to-Digital Converter) and DAC (Digital-to-Analog Converter)**. The ADCs boast a typical dynamic range of 105 dB (A-Weighted), while the DACs achieve an exceptional 110 dB, ensuring that audio signals are captured and reproduced with pristine clarity and minimal noise. This high channel count and fidelity are crucial for applications like surround sound processing and multi-zone audio distribution.
A key highlight of the ADAU1328BSTZ is its **ultra-low power operation**, which is a critical advantage for portable and battery-powered devices. The core can operate on a supply voltage as low as 1.8 V, with the digital core consuming just 21 mW at 1.8 V and 48 kHz. This efficiency does not come at the cost of performance, enabling designers to create feature-rich audio products with extended battery life.
System integration is simplified through a **high-speed I²C or SPI control interface** for configuring the extensive set of internal registers and a separate **serial audio interface** (supporting I²S, left-justified, right-justified, and TDM modes) for data transmission. The inclusion of a **TDM (Time-Division Multiplexing) interface** is particularly valuable, as it allows the device to easily communicate with multiple other audio components over a single data line, reducing system complexity and board space.
Furthermore, the device includes several integrated features that enhance its usability, such as a flexible digital mixer, a phase-locked loop (PLL) for clock generation, and a comprehensive suite of on-chip digital audio effects. Its **small 64-lead LQFP package** ensures it can fit into space-constrained designs without compromising on functionality.
ICGOOODFIND: The ADAU1328BSTZ successfully merges high-performance audio processing with remarkable power efficiency. Its combination of a programmable SigmaDSP core, excellent eight-channel converters, and versatile serial interfaces establishes it as a superior integrated solution for developers aiming to architect advanced, multi-channel audio systems without exceeding their power budget.
**Keywords:** SigmaDSP Core, Low-Power Operation, 8-Channel Audio Codec, 24-Bit ADC/DAC, Programmable Audio Processing
