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.

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)