[AK7742]

Rev.0.5b_PB

2008/08

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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. The AK7742 is available in a space saving small 48pin LQFP package.

- 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

- 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)

- 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)

GENERAL DESCRIPTION

FEATURES

24bit 2ch ADC + 24bit 4ch DAC with Audio DSP

AK7742

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