Hands Free DSP with Mono CODEC

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  • Evaluation Board Manual
  • Data Sheet


The AK7756 is a highly integrated digital signal processor, including a mono voice audio codec, a MIC pre-amplifier and digital audio I/F. The audio DSP has 9216step at fs = 8kHz parallel processing power. As the AK7756 is a RAM based DSP, it is programmable for user requirements such as hands free and acoustic effect. The AK7756EN is available in a space saving small 28pin QFN package and the AK7756VF is available in a 30pin VSOP package.

Key Features


- Word length: 24bit (Data RAM 24bit floating point)

- Instruction cycle: 13.6 ns (9216 steps at fs=8 kHz)

- Multiplier 20 x 20 → 36bit (double precision available)

- Divider 20 / 20 → 20bit

- ALU: 36bit arithmetic operation (with overflow margin 4bit) 24bit floating point arithmetic and logic operation

- Program RAM: 3072 x 36bit

- Coefficient RAM: 2048 x 20bit

- Data RAM: 1024 x 24-bit (24bit floating point)

- Delay RAM: 3072 x 20bit, 3072 x 20bit

- Master Clock: 4.6MHz to 73.7MHz

- JX pins (Interrupt)

• Audio Serial I/F

- Master / Slave operation

- Right / Left justified and I2S

- PCM (Short / Long Frame)

- 16bit linear, 8bit A-law, 8bit µ-law

• Mono CODEC

- Sampling Rate 8KHz, 16KHz

- DAC S/N: 91dB, S/(N+D): 83dB (fs:16kHz)

- ADC S/N: 86dB, S/(N+D): 77dB (fs:16kHz)

• Microphone interface

- Differential or single-ended input

- Programmable Gain (+33dB to +15dB and 0dB, 3dB step)

- Low Noise Microphone Bias

• Automatic Power Down (CODEC, DSP)

• μP I/F : SPI, I2C-slave

• I2C bootloader

• Power supply

Analog (AVDD): 3.0V to 3.6V (typ.3.3V)

Digital1 (DVDD): 3.0V to 3.6V (typ.3.3V)

Digital2 (DVDD18): 1.7V to 1.9V (typ.1.8V)

• Operating temperature range: -20°C to 85°C (AK7756EN), -40°C to 85°C (AK7756VF)

• Package: 28pin QFN (AK7756EN)

30pin VSOP (AK7756VF)

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Block Diagram

Block Diagram

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