AK7734XQ

Audio DSP with 2-Channel ADC/SRC

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Description

The AK7734 is a highly integrated audio digital signal processor with integrated 2ch 24bit ADC and 2ch SRC. It includes internal memories for digital audio processing, that allows surround effect process, time alignment and parametric equalizing. More over, the AK7734 can process both data and filter coefficients as floating point data so that high accuracy IIR/FIR filter performance can be achieved easily. The internal SRC has various sampling rate converting modes, corresponds many sampling rates without changing the DSP operating sampling frequency. The AK7734 can operate a hands-free software by AKM, as well as sound processing, by programs downloaded via the microprocessor interface.

Key Features

[DSP Block]

- Word length: 24bit (Coefficient RAM & Data RAM: F24 floating point)

- Processing Speed: 13.6 ns (1536step/fs; fs = 48kHz)

- Multiplication: 20 x 24 → 44-bit Double precision arithmetic available

- Divider 20 / 20 → 20bit

- ALU: 48bit arithmetic operation (overflow margin 4bit) 20bit floating point arithmetic and logic operation

- Program RAM: 3072 x 24bit

- Coefficient RAM: 2048 x 24bit (F24 floating point)

- Data RAM: 2048 x 24-bit (F24 floating point)

- Offset Register: 64 x 13bit

- Delay RAM1: 3072 x 24-bit

- Delay RAM2: 2048 x 24-bit

- Sampling rate: fs= 7.35k to 48kHz

- Master Clock: 1536fs

(generated from 32fs, 48fs, 64fs, 128fs, 256fs, 384fs by internal PLL)

- Master/Slave Operation

[ADC Block]

- 64 times Over sampling

- 24bit 2ch

- Sampling rate: 7.35 to 48kHz

- S/(N+D): 83dB (fs = 48kHz)

- DR, S/N: 96dB (fs = 48kHz)

- Integrated DC offset canceling High Pass Filter

[SRC Block]

- 2ch x 1 system

- Support frequency: Fin = 7.35kHz to 96kHz → Fout = 7.35kHz to 48kHz

(FSO/FSI = 0.167 to 6.0)

[Digital Interface Input/Output]

- 8ch Serial Data Input

- 8ch Serial Data Output

[Micro Computer Interface]

- I2C Interface or 4-wired Interface

[General]

- Integrated PLL

- Integrated Regulator 3.3V → 1.8V

- Power Supply: 3.3V ± 0.3V

- Operating Temperature Range: -40˚C to 85˚C

- 48pin LQFP

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Block Diagram

Block Diagram

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