GENERAL DESCRIPTION
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.

FEATURES
□ DSP
   - 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 ~ 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 ~ +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 ~ 3.6V (typ.3.3V)
   Digital1 (DVDD) : 3.0V ~ 3.6V (typ.3.3V)
   Digital2 (DVDD18) : 1.7V ~ 1.9V (typ.1.8V)
□ Operating temperature range: -20°C ~ 85°C (AK7756EN), -40°C ~ 85°C (AK7756VF)
□ Package:
   28pin QFN (AK7756EN)
   30pin VSOP (AK7756VF)