The SigmaDSP 28-/56-Bit audio processor features two ADCs and four DACs, with complete standalone operation, self-boot from serial EEPROM, fully programmable with SigmaStudio graphical tool, and flexible serial data input/output ports.
The ADAU1702 is a single‑chip audio system that combines a 28‑/56‑bit SigmaDSP audio processor, two high‑performance ADCs, four DACs, and programmable GPIOs. It supports up to 192 kHz sampling rates, offers on‑chip voltage regulation for 3.3 V systems, and can be programmed with the SigmaStudio graphical tool.
This handbook (Rev C) details the device’s features, functional block diagram, electrical specifications, pin configurations, digital timing diagrams, PLL and oscillator settings, power supply information, and recommended layout and application schematics. It also includes an ordering guide and package dimensions.
| ADC resolution | 24 bits |
|---|---|
| ADC Signal‑to‑Noise Ratio (A‑Weighted) | 100 dB |
| ADC Total Harmonic Distortion + Noise | ‑83 dB |
| DAC Signal‑to‑Noise Ratio (A‑Weighted) | 104 dB |
| DAC Total Harmonic Distortion + Noise | ‑90 dB |
| Analog supply voltage (AVDD) | 3.3 V |
| Digital supply voltage (DVDD) | 1.8 V |
| PLL lock time | 20 ms |
| Maximum sampling rate | 192 kHz |
The ADCs have a resolution of 24 bits.
The analog supply (AVDD) is 3.3 V and the digital supply (DVDD) is 1.8 V.
The device supports sampling rates up to 192 kHz.