AK7742
Overview
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.
- DSP: - Word length: 24bit (Data RAM 24bit floating point) - Instruction cycle: 13.6 ns (1536step/fs fs=48kHz; 9216step/fs fs=8kHz) - Multiplier 20 x 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 x 36bit - Coefficient RAM: 1536 x 16bit - Data RAM: 1536 x 24-bit (24bit floating point) - Delay RAM: 74kbit (3072 x 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 x 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 x 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:
