The new-generation ADAU1797 audio processing engine with 2-way SIMD floating-point, offers low latency at sample rates up to 768kHz (2x the sample rate of the existing ADU1860), and supports up to 128 FDSP instructions (twice the ADU1860). And instead of the Hybrid class-G amplifier, the ADAU1797 device includes an integrated closed loop, ultra-low power, class-D amp, which is also available as a standalone part for multiple drivers and stereo banded headphones.
Intended applications include advanced audio processing for headphones and in-ear designs, VR and AR headsets, wearables, hearing assist and PSAP devices. The ADAU1797 increases processing capability over the existing ADAU1860 and ADAU1787 devices, enabling developers to offload cycles from the host processor, leverage a lower-cost host processor, and increase system capability for high-fidelity, low-latency audio processing. The Tensilica HiFi-3z DSP with floating point allows for higher precision audio algorithms, with ease of programming over fixed point processing.
The integrated 3-channel high-performance analog-to-digital converter supports analog microphones as required for feedforward and feedback ANC processing. The ADAU1797 supports up to 3 analog microphones and 10 digital microphones for feedback loops, voice and bone conduction applications. The 24-bit DAC playback channel, integrated with the Class-D amplifier stage improves power efficiency compared to all previous generations of Analog Devices audio processors.
In terms of connectivity, the ADAU1797 features two high-performance PDM output channels supporting 3.072MHz or 6.144MHz clock rates, two 32-bit I2S/TDM serial audio data ports, sync clock frequencies from 8kHz to 768kHz, and two full-duplex, 4-channel ASRCs. Digital Control and Communication interfaces include I2C/SPI control and I3C combined interfaces, master QSPI, UART, and JTAG interfaces, with support for self-boot from QSPI Flash/EEPROM. There are also useful multi-purpose I/O pins for GPIO / IRQ support.
"The ADAU1797 represents the next step in Analog Devices' portfolio of low latency audio processors for hearable applications. Compared to the previous generation, the ADAU1797 has twice the DSP processing capability, over three times the on-chip memory, and a 33% increase in headphone amplifier output power with higher efficiency. This upgrade is enabling our customers to achieve improved voice processing capabilities and more personalized audio features enhanced by state-of-the-art noise-cancelling performance. We're excited to see what other innovative solutions our customers will unlock as we further advance our mission of enhancing human sensory experiences," says Matthew Tyler, Managing Director, Consumer Business Unit at Analog Devices.
Detailing the mentioned 33% increase in headphone amplifier power over previous generations, Analog Devices explains that the ADAU1797's 1.15Vrms full scale output voltage @16 ohm results in 80mW power, while the full scale output voltage for the ADAU1860, as an example, is 1.00Vrms, which at 16 ohm equals 60mW full scale power.
Development with the new ADAU1797 integrated audio processor is supported by the updated SigmaStudio+ development environment at launch. Devices are sampling now, and the SigmaStudio+ installer is now available.
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