AK7754EN-L

GENERAL DESCRIPTION

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.

FEATURES

□ 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 x 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 x 36bit
- Coefficient RAM: 2048 x 16bit (F24 floating point)
- Data RAM: 512 x 24-bit (F24 floating point)
- Offset Register: 32 x 12bit
- Delay RAM1: 3072 x 24bit
- Delay RAM2: 2048 x 12bit
- 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 20/16bit and I2S
- Short / Long Frame
-24 bit linear, 8 bit A-law, 8 bit µ-law
□ Stereo 24bit ADC Block
- Sampling rate: 8 ~ 48kHz
- ADC Characteristics S/(N+D): 82dB ,DR, S/N: 89dB
- Three Analog Input Selectors (Differential, Single-ended Inputs)
- Channel Independent MIC, Analog Line Gain Amp (0dB, 9dB~27dB, 3dBstep)
- Channel Independent Digital Volume (24dB ~ -103dB, 0.5dB Step, Mute)
- Integrated DC offset canceling High Pass Filter
□ Digital Microphone I/F
□ Stereo 24bit DAC
- Sampling rate: 8 ~ 48kHz
- Digital Volume (12dB~-115dB, 0.5dB Step, Mute)
- Digital De-emphasis Filter (tc=50/15μs, fs=32kHz, 44.1kHz, 48kHz)
□Line Outputs
- Single-ended or Differential Outputs
- S/(N+D): 91dB ,DR, S/N: 96dB
- Stereo Analog Volume (+0 ~ -28dB, 2.0dB Step, Mute)
□ Stereo Headphone Amplifier with a Volume Control
- Rated Output Power: 27mW/ch @16Ω
- S/(N+D): 70dB , S/N: 89dB
- Stereo Analog Volume (+0 ~ -50dB,1.0/2.0/4.0dB Step, Mute)
- Click Noise Free at Power ON/OFF
□ SRC Block
- 2ch x 1 system
- Input Sampling Frequency: 8kHz ~ 96kHz
- Output Sampling Frequency: 8kHz ~ 48kHz
□ Analog Bypass Mode
- Bypass Amplifier (0dB~-21dB, 3dB step)
□ Output Mixer
□ μP 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)
□ Operating temperature range: -20°C ~ 85°C
□ Package: 48pin QFN (0.5mm pitch)