General Description

The AK7740 is a highly integrated audio processing IC, including four 24-bit output D/A channels, a stereo 24-bit input A/D, and an audio DSP. High quality analog output performance is provided by the quad DAC with 97dB dynamic range, and the stereo ADC with 98dB dynamic range. The converters support sampling frequencies from 32kHz to 48kHz. This device includes 72kbits of SRAM audio delay that is suitable for simulated sound fields. The DSP is optimized for audio signal processing. The design allows up to 512 execution lines per audio sample cycle, with multiple functions per line. The AK7740 is ideal for sound field control applications, including echo, 3D, parametric equalization, and speaker compensation. It is housed in a 48-lead LQFP package.

Features

DSP:

- Word length: 24-bit (Data RAM)

- Instruction cycle time: 40ns (512fs, fs=48kHz )

- Multiplier: 24 x 16 → 40-bit

- Divider: 24 / 24 → 16-bit or 24-bit

- ALU: 34-bit arithmetic operation (overflow margin: 4-bits)

- 24-bit arithmetic and logic operation

- Shift+Register: 1, 2, 3, 4, 6, 8 and 15 bits shifted left

- 1, 2, 3, 4, 8 , 14 and 15 bits shifted right

- Other numbers in parentheses are restricted. Provided with indirect shift function

- Program RAM: 512 x 32-bit

- Coefficient RAM: 512 x 16-bit

- Data RAM: 256 x 24-bit

- Offset RAM: 48 x 13-bit

- (6144 x 12-bit / 3072 x 24-bit / 4096 x 12-bit + 1024 x 24-bit )

- Internal Memory: 72kbit SRAM

- Sampling frequency: 32kHz to 48kHz

- Serial interface port for micro-controller

- Master clock: 512fs

- Master/Slave operation

- Serial signal input port ( 2 to 4 ch ): 16/20/24-bit : Output port ( 2 ch ): 24-bit

ADC: 2 channels

- 24-bit 64x over-sampling delta sigma

- DR, S/N : 98dBA ( full-differential Input )

- S/(N+D) : 89dB

- Digital HPF (fc = 1Hz)

- Single-ended or full-differential Input

DAC: 4 channels

- 24-bit 128x over-sampling advanced multi-bit

- DR, S/N : 97dBA

- S/(N+D) : 89dB

- Single ended or differential output

Input Selector

- 1 full-differential and 4 single-ended Input

Other

- Power supply: +3.3V±10

- Operating temperature range: -10°C~70°C

- Package: 48pin LQFP (0.5mm pitch)