AD1954: SigmaDSP™ 3-Channel, 26-Bit Signal Processing DAC Data Sheet (Rev. B)9/6/20091470 kB
Features and Benefits
- 5 V 3-Channel Audio DAC System
- Accepts Sample Rates up to 48 kHz
- 7 Biquad Filter Sections per Channel
- Dual Dynamic Processor with Arbitrary Input/Output Curve and Adjustable Time Constants
- Differential Output for Optimum Performance
- 0 ms to 6 ms Variable Delay/Channel for Speaker Alignment
- Stereo Spreading Algorithm for Phat Stereo™ Effect
- See data sheet for additional features
The AD1954 is a complete 26-bit single-chip 3-channel digital audio playback system with built-in DSP functionality for speaker equalization, dual-band compression/limiting, delay compensation, and image enhancement. These algorithms can be used to compensate for real-world limitations of speakers, amplifiers, and listening environments, resulting in a dramatic improvement of perceived audio quality.
The signal processing used in the AD1954 is comparable to that found in high-end studio equipment. Most of the processing is done in full 48-bit double-precision mode, resulting in very good low-level signal performance and the absence of limit cycles or idle tones. The compressor/limiter uses a sophisticated two-band algorithm often found in high-end broadcast compressors.
An extensive SPI port allows click-free parameter updates, along with read-back capability from any point in the algorithm flow.
The AD1954 includes ADI’s patented multibit sigma-delta DAC architecture. This architecture provides 112 dB SNR and dynamic range and THD+N of –100 dB. These specifications allow the AD1954 to be used in applications ranging from low-end boom boxes to high-end professional mixing/editing systems.
The AD1954 also has a digital output that allows it to be used purely as a DSP. This digital output can also be used to drive an external DAC to extend the number of channels beyond the three that are provided on the chip.
This chip can be used with either its default signal processing program or with a custom user-designed program. Graphical programming tools are available from ADI for custom programming.
- 2.0/2.1 Channel Audio Systems (Two Main Channels plus Subwoofer)
- Multimedia Audio
- Automotive Sound Systems
- Minicomponent Stereo
- Home Theater Systems (AC-3 Postprocessor)
- Musical Instruments
- In-Seat Sound Systems (Aircraft, Motor Coaches)
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Documentation & Resources
AN-211: The Alexander Current-Feedback Audio Power Amplifier1/1/20001154 kB
AN-327: DAC ICs: How Many Bits Is Enough?1/1/2000345 kB
Simplify Audio Setups with a SigmaDSP™ Pre-Programmed Fully Configurable Digital Audio Processor1/1/2002 Analog Dialogue
Software & Systems Requirements
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.
|Part Number||Material Declaration||Reliability Data||Pin/Package Drawing||CAD Symbols, Footprints & 3D Models|
|AD1954YSTZ||Material Declaration||Reliability Data||48-Lead LQFP (7mm x 7mm)|
|AD1954YSTZRL||Material Declaration||Reliability Data||48-Lead LQFP (7mm x 7mm)|
|AD1954YSZ||Material Declaration||Reliability Data||44-Lead MQFP (13.2mm x 10mm)|
|Wafer Fabrication Data|
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