AK7746

[ASAHI KASEI] [AK7746] AK7746 Audio DSP with 5-channel 24-bit ADC and Input Mux 1. 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. The programmable DSP allows up to 4608 execution lines per audio sample cycle at 8kHz, 768 lines at 48kHz, or 384 lines at 96kHz with multiple functions per line. The AK7746 can be used to implement complete sound field control, such as echo, 3D, parametric equalization, etc. It is packaged in a 64-lead LQFP. 2. Features DSP: Word length: Instruction cycle time: Multiplier: Divider: ALU: 24-bit (Data RAM) 27ns (768fs, fs=48kHz ) 24 x 16 → 40-bit 24 / 24 → 16-bit or 24-bit 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 Sa...