Audio DSP with 3ch ADC, 4ch DAC and MIC Amplifier

AKM today launched the AK7757, an audio digital signal processor (DSP) with a stereo 24-bit ADC, a monaural ADC, two stereo 24-bit DACs and a microphone amplifier, providing high quality sound for both audio and hands-free voice applications.


AKM’s royalty-free high performance noise and echo cancellation algorithms are available for porting to the AK7757.

The hands-free voice algorithm enables full-duplex telephone calls in high noise environments, such as an automobile. Both echo and noise cancellation algorithms are included in the hands-free program. Parameters are fully tunable for a variety of operating conditions.


The audio DSP features 24-bit floating point arithmetic, and it has a parallel operation capability of 1536 steps/fs (at 48kHz sampling). In addition, a RAM program area is freely programmable for user applications.


For SRS or Dolby licensed users, programs such as ProLogic II, DAEP, CS Auto and WOW HD can be ported. Users can create their own applications by combining standard programs with their original algorithms. A GUI-based development programming tool is available.

An integrated large memory eliminates the need for external program memory. Programs are loaded into internal RAM via a serial interface from a microcontroller, allowing for seamless updates.


The AK7757 has one integrated stereo ADC, one monaural ADC and two stereo DAC’s, making it possible to realize the main block of a car audio system without requiring additional audio components. For connecting to other audio devices, a flexible serial interface is available with four inputs (six when not using the ADC) and six output channels.


The AK7757 operates with MSB-first, LSB-first and I²S audio data formats. It can provide signals to a class-D amplifier and receive input data from external digital audio sources. The AK7757 also has a microphone amplifier and a microphone bias circuit, saving board space. Additionally, it includes a mode that generates the master clock from a bit clock stream, enabling easy connection to a Bluetooth module.


The operating voltage ranges from 3.0 to 3.6V for the analog block, from 3.0 to 3.6V for the digital interface and from 1.7 to 1.9V for the digital block.


The AK7757 is housed in a 48-pin LQFP package.


Evaluation boards and samples are available now.


To obtain more information about the AK7757, please visit here