| The AK7754 is a highly integrated audio digital signal processor (DSP) with two Audio I/F’s, Microphone and Headphone Amplifier. The audio DSP has 1536step/fs (at 48KHz sampling) parallel processing power, and AKM’s original Hands-free technology provides high performance noise and echo cancelling. The 96k-bit delay memory allows surround processing, acoustic effect and parametric equalizers. As the AK7754 is a RAM based DSP, it is programmable for user requirements. The internal SRC has various sampling rate converting modes, corresponds many sampling rates without changing the DSP operating sampling frequency. The AK7754 is available in a space saving small 48pin QFN package. |
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- Applications: Car Hands Free Kits, PND’s, Smartphones and Car Audios
- DSP Block
- Word length: 24bit (Coefficient RAM & Data RAM: F24 floating point)
- Processing Speed: 13.6 ns (1536step/fs fs=48kHz; 9216step/fs fs=8kHz)
- Multiplication: 20  16  36-bit Double precision arithmetic available
- Divider 20 / 20 20bit
- ALU: 40bit arithmetic operation (overflow margin 4bit) 24bit floating point arithmetic and logic operation
- Program RAM: 2048 36bit
- Coefficient RAM: 2048 16bit (F24 floating point)
- Data RAM: 512 24-bit (F24 floating point)
- Offset Register: 32 12bit
- Delay RAM1: 2048 24bit
- Delay RAM2: 2048 24bit
- Sampling rate: fs= 8.0k ~ 48kHz
- Master/Slave Operation
- Master Clock: 1536fs
(generated from 32fs, 48fs, 64fs, 128fs, 256fs, 384fs by internal PLL)
- Two Digital Interfaces (I/F 1, I/F 2)
- Digital Signal Input Port (4ch) MSB justified 24bit/LSB justified 24/20/16bit and I2S
- Digital Signal Input Port (6ch) MSB justified 24bit/ LSB justified 24/16bit and I2S
- Short / Long Frame
-24 bit linear, 8 bit A-law, 8 bit  -law
- Stereo 24bit ADC Block
- 64 times Over sampling
- Sampling rate: 8 ~ 48kHz
- Three Analog Input Selectors (Differential, Single-ended Inputs)
- Line Gain Amplifier for Microphone (+27dB~0dB, 3dBstep)
- S/(N+D): 82dB
- DR, S/N: 91dB
- Channel Independent Digital Volume (24dB ~ -103dB, 0.5dB Step, Mute)
- Integrated DC offset canceling High Pass Filter
- Digital Microphone I/F
- Stereo 24bit DAC
- 128 times Over-sampling
- Sampling rate: 8 ~ 48kHz
- Digital Volume (12dB~-115dB, 0.5dB Step, Mute)
- Digital De-emphasis Filter (tc=50/15s, fs=32kHz, 44.1kHz, 48kHz)
- Line Outputs
- Single-ended or Differential Outputs
- S/(N+D): 88dB ,DR, S/N: 96dB
- Stereo Analog Volume (+0 ~ -30dB, 2.0dB Step, Mute)
- Stereo Headphone Amplifier with a Volume Control
- Rated Output Power: 27mW/ch @16
- S/(N+D): 73dB , S/N: 86dB
- Stereo Analog Volume (+0 ~ -50dB,1.0/2.0/4.0dB Step, Mute)
- Click Noise Free at Power ON/OFF
- SRC Block
- 2ch 1 system
- Input Sampling Frequency: 8kHz ~ 96kHz
- Output Sampling Frequency: 8kHz ~ 48kHz
- Analog Bypass Mode
- Bypass Amplifier (0dB~-21dB, 3dB step)
- Output Mixer
- Serial P Interface: I2C Bus (400KHz Fast-Mode)
- 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)
HP-Amp HVDD: 3.0V ~ 3.6V (typ.3.3V)
- Low Power Dissipation: TBD mA
- Operating temperature range: -20°C ~ 85°C
- Package: 48pin QFN (0.5mm pitch)
- Evaluation Board: AKD7754
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