| The AK7742 is a highly integrated audio digital processor, including two stereo 24bit DAC’s and one stereo ADC with input selector. The stereo DAC and ADC feature high performance, archiving 106dB and 96dB dynamic range respectively, 8kHz to 96kHz sampling rate are supported. The audio DSP has 1536step/fs parallel processing power, and 74k-bit delay memory allows surround processing, acoustic effect and parametric equalizers. As the AK7742 is a RAM based DSP, it is programmable for user requirements. |
 |
Applications: Personal Navigation Devices (PND), Speaker Systems
DSP:
- Word length: 24bit (Data RAM 24bit floating point)
- Instruction cycle: 13.6 ns (1536step/fs fs=48kHz; 9216step/fs fs=8kHz)
- Multiplier 20  16  36bit (double precision available)
- Divider 20 / 20 20bit
- ALU: 40bit arithmetic operation (overflow margin 4bit) 24bit floating point arithmetic and logic operation
- Program RAM: 1536 36bit
- Coefficient RAM: 1536 16bit
- Data RAM: 1536 24-bit (24bit floating point)
- Delay RAM: 74kbit (3072 24bit)
- Sampling frequency: 8kHz ~ 96kHz
- Master / Slave operation
- Serial signal input port (4ch) MSB justified 24bit / LSB justified 24 / 20 / 16bit and I2S
- Serial signal output port (6ch) MSB justified 24bit / LSB justified 24 / 16bit and I2S
ADC: 2ch (stereo)
- 24bit 64 Over-sampling delta sigma (fs=8kHz~48kHz)
- DR, S/N: 96dB (fs=48kHz, fully differential input)
- S/(N+D): 84dB (fs=48kHz)
- Differential, Single-end Inputs
- Digital HPF (fc=1Hz)
- 3:1 Analog input selector
- Digital Volume (24dB~-103dB, 0.5dB Step, Mute)
DAC: 4ch (two stereo pairs)
- 24bit 128 Over-sampling advanced multi-bit (fs=8kHz~96kHz)
- DR, S/N: 106dB
- S/(N+D): 92dB
- Differential output
- Digital Volume (24dB~-103dB, 0.5dB Step, Mute)
DSP Through Mode
I2C BUS interface for micro-controller
Power supply: +3.3V ±0.3V, internal regulator for 1.8V
Operating temperature range: -20°C~70°C (AK7742EQ), -20°C~85°C (AK7742EN)
Package: 48pin LQFP, 0.5mm pitch (AK7742EQ)
48pin QFN, 0.4mm pitch (AK7742EN)
Evaluation Board: AKD7742
|
