GENERAL DESCRIPTION

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. Asthe AK7742 is a RAM based DSP, it is programmable for user requirements. The AK7742 is available in a space saving small 48pin LQFP package.

FEATURES

■ 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: +3.3V ±0.3V, internal regulator for 1.8V

■ Operating temperature range: -20°C~70°C

■ Package: 48pin LQFP (0.5mm pitch)

AK7742屬于集成電路（IC） > DSP（數(shù)字信號處理器）。旭化成微電子株式會社制造生產(chǎn)的AK7742DSP（數(shù)字信號處理器）數(shù)字信號處理器是類似于微處理器或微控制器的器件，但區(qū)別在于其內(nèi)部架構(gòu)經(jīng)修改，適用于對連續(xù)數(shù)據(jù)流連續(xù)執(zhí)行以乘法和加法運算為主的算法，而不是以條件邏輯或大量并發(fā)進程為主的算法。該器件通常用于諸如音頻或視頻信號處理等應(yīng)用。