Analog Devices Inc. ADAU1701 SigmaDSP® 28/56-Bit Audio Processor
Analog Devices ADAU1701 SigmaDSP® 28/56-Bit Audio Processor is a complete single-chip audio system with a 28-/56-bit audio DSP, ADCs, DACs, and microcontroller-like control interfaces. Signal processing includes equalization, cross-over, bass enhancement, multiband dynamics processing, delay compensation, speaker compensation, and stereo image widening. This processing can be used to compensate for real-world limitations of speakers, amplifiers, and listening environments, providing dramatic improvements in perceived audio quality.
Its signal processing is comparable to that found in high-end studio equipment. Most processing is done in full 56-bit, double precision mode, resulting in very good low-level signal performance. The ADAU1701 is a fully programmable DSP. The easy to use SigmaStudio™ software allows the user to graphically configure a custom signal processing flow using blocks such as bi-quad filters, dynamics processors, level controls, and GPIO interface controls.
Analog Devices ADAU1701 programs can be loaded on power-up either from a serial EEPROM, through its self-boot mechanism, or from an external microcontroller. On power-down, the current state of the parameters can be written back to the EEPROM from the ADAU1701 to be recalled the next time the program is run.
Two Σ-Δ ADCs and four Σ-Δ DACs provide a 98.5dB analog input to analog output dynamic. Each ADC has a THD + N of −83dB, and each DAC has a THD + N of −90dB. Digital input and output ports allow a glueless connection to additional ADCs and DACs. The ADAU1701 communicates through an I2C® bus or a 4-wire SPI port.
Features
- 28-/56-bit, 50MIPS digital audio processor
- 2 ADCs (SNR of 100dB, THD + N of −83dB)
- 4 DACs (SNR of 104dB, THD + N of −90dB)
- Complete standalone operation
- Self-boot from serial EEPROM
- Auxiliary ADC with 4-input mux for analog control
- GPIOs for digital controls and outputs
- Fully programmable with SigmaStudio graphical tool
- 28-bit × 28-bit multiplier with 56-bit accumulator for full double-precision processing
- Clock oscillator for generating a master clock from crystal
- PLL for generating master clock from 64 × fS, 256 × fS, 384 × fS, or 512 × fS clocks
Applications
- Multimedia speaker systems
- MP3 player speaker docks
- Automotive head units
- Mini-component stereos
- Digital televisions
- Studio monitors
- Speaker cross-overs
- Musical instrument effects processors
- In-seat sound systems (aircraft/motor coaches)
Additional Resources
- Circuit Note CN-0162: Analog Audio Input, Class-D Output with the ADAU1701 SigmaDSP Codec, Low Power SSM2306 Class-D Amplifier, and ADP3336 LDO Regulator
- Application Note AN-951: Using Hardware Controls with SigmaDSP GPIO Pins
- Application Note AN-923: Designing a System Using the ADAU1701/ADAU1702 in Self-Boot Mode
- SigmaStudio® Software Development Tools
Functional Block Diagram
