AK7754 Datasheet, PDF (1/26 Pages) Asahi Kasei Microsystems – Audio DSP with Stereo CODEC + MIC/HP-AMP

[AK7754]
AK7754
Audio DSP with Stereo CODEC + MIC/HP-AMP
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. 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.
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
MS1138-E-01-PB
-1-
2012/03