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GENERAL DESCRIPTION

The AK7780 is a highly integrated audio processor, including a 28-bit floating point DSP, two 24-bit stereo ADC’s and one mono ADC. The stereo ADC’s feature high performance, achieving 96dB dynamic range, they include 8:1 input selectors. The ADC supports sampling frequencies from 7.35 kHz to 96 kHz. The AK7780 also includes a stereo sample rate converter (SRC), so it can be used as a master device when it receives digital audio inputs. The DSP includes 168kbits of SRAM for audio delay data that is suitable for creating simulated surround fields. The programmable DSP block is realized with 2560step/fs DSP. It supports sampling frequencies from 7.35kHz to 96 kHz. The AK7780 is used to implement complete sound field control, such as echo, 3D, parametric equalization, and other sound enhancements. It is packaged in a 100-lead LQFP package.

FEATURES

[DSP]

Main

■ Word length: 28-bit (Data RAM F24.4 limited range floating point)

■ Instruction cycle time: 8.1 ns (2560step/fs fs=48kHz; 1280step/fs fs=96kHz)

■ Multiplier: 24 x 16 → 40-bit (Double precision available)

■ Divider: 24 / 24 → 24-bit

■ ALU: 44-bit arithmetic operation (overflow margin: 4-bits)

F24.4 arithmetic and logic operation

■ Shift+Register: Flexible setting

■ Program RAM: 2048 x 36-bit

■ Coefficient RAM: 2048 x 16-bit

■ Data RAM: 2048 x 28-bit (F24.4[sign bit + 23-bit mantissa + 4-bit exponent])

■ Offset RAM: 64 x 13-bit

■ Internal Delay RAM: 168kbits

( 6144 x 28 bit / 2048 x 28 bit + 8192 x 14 bit / 3072 x 28 bit + 6144 x 14 bit

/ 4096 x 28 bit + 4096 x 14 bit) 4 pattern setting

28bit = F24.4 [24 bit sign & mantissa: 4 bit exponent]

14bit = F10.4 [10 bit sign & mantissa: 4 bit exponent]

■ Sampling frequency: 7.35kHz ~ 96kHz

■ Serial interface port for microcontroller or I2C BUS control

■ Master Clock: 2560fs (generated by PLL from 32fs ,64fs, 256fs and 384fs)

■ Master/Slave operation

■ Serial signal input port (10ch): MSB justified 24-bit / LSB justified 16/20/24-bit and I2S

■ Serial signal output port(12ch): MSB justified 24-bit / LSB justified 24,16-bit and I2S (SDOUT1,SDOUT2 and SDOUT3)

[ADC]

4 channels (2 stereo pairs)

■ 24-bit 64X over-sampling delta-sigma (fs = 7.35kHz ~ 96kHz)

■ DR, S/N: 96dBA (fs = 48kHz, fully-differential input)

■ S/(N+D): 92dB (fs = 48kHz)

■ Digital HPF (fc = 1Hz)

[ADC]

Mono single channel

■ 24-bit 64X over-sampling delta sigma (fs = 7.35kHz ~ 96kHz)

■ DR, S/N: 95dBA ( fs = 48kHz)

■ Includes digital attenuator

[SRC]

Stereo pair

■ Input frequency 7.35kHz ~ 96kHz → Output frequency 44.1kHz ~ 96kHz

[Other]

■ Power supply: +3.3V ±0.3V, +1.7V~+2.0V(typ +1.8V)

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

■ Package: 100pin LQFP(0.5mm pitch)