General Description

The AK7746 is a highly integrated audio processor, including 5 A/D channels, an input mux that can select 2 stereo pairs from 8 stereo inputs, and an on-chip DSP. High quality analog performance is provided by the ADC’s achieving 98dB (48kHz) dynamic range. The A/D supports sampling frequencies from 8kHz to 96kHz. The AK7746 includes 72kbits of SRAM for audio delay that is suitable for simulated surround functions and speaker compensation.

特性 Features

DSP:

- Word length: 24-bit (Data RAM)

- Instruction cycle time: 27ns (768fs, fs=48kHz )

- Multiplier: 24 x 16 → 40-bit

- Divider: 24 / 24 → 16-bit or 24-bit

- ALU: 34-bit arithmetic operation (Overflow margin: 4bit)

- 24-bit arithmetic and logic operation

- Shift+Register: 1, 2, 3, 4, 6, 8 and 15 bits shifted left 1, 2, 3, 4, 8 and 15 bits shifted right (Other numbers in parentheses are restricted. Provided with indirect shift function)

- Program RAM: 768 x 32-bit

- Coefficient RAM: 1024 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: 8kHz to 96kHz

- Serial interface port for micro-controller

- Master clock: 768fs@48kHz ( generated by PLL from 256fs or 384fs )

- Master/Slave operation

- Serial signal input port ( 8(10) ch ):16/20/24-bit : Output port ( 8ch + 4ch ): 24-bit

ADC: 4 channels (2 channels 2 sets )

- 24-bit 64 x Over-sampling delta sigma

- Sampling frequency: 8kHz to 96kHz

- DR: 98dBA ( fs=48 kHz Full-differential Input )

- S/N : 98dBA ( fs=48 kHz Full-differential Input )

- S/(N+D) : 91dB ( fs= 48 kHz Full-differential Input )

- Digital HPF (fc = 1Hz)

- Single-ended or Full-differential Input

ADC: Monaural 1 channel

- 24-bit 64x Over-sampling delta sigma

- Sampling frequency: 8kHz to 96kHz

- DR: 97dBA ( fs=48 kHz )

- S/N : 97dBA ( fs=48 kHz )

- S/(N+D) : 91dB ( fs= 48 kHz )

Other

- External Jump pin: 3(maximum)

- CRC error check function

- LRCLK and BITCLK input and output for slave mode

- Power supply: +3.3V±0.3V

- Operating temperature range: -40°C~85°C

- Package: 64pin LQFP (0.5mm pitch)