AK7722VQ

24Bit 4CH ADC + 24Bit 4CH DAC with Audio DSP

GENERAL DESCRIPTION

The AK7722 is a digital signal processor with an integrated 4ch 24bit DAC, a stereo ADC with input selector and a 2ch input ADC. The integrated 4ch DAC, the 2ch ADC with inputselector and the other 2ch ADC feature high performance achieving 108dB, 96dB and 95dB, respectively. The integrated SRC has three input selector enabling the DSP to operate in master mode with digital inputs. The audio DSP has 1536step/fs at 48kHz sampling parallel arithmeticoperation performance and the 5k-word delay RAM allows surround processing and time alignment adjusting. As the AK7722 is a RAM based DSP, it is programmable for various user requirements. It is housed in an 80pin LQFP package.  

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 36bit

\- 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 ~ 48kHz 

\- Master Clock: 1536fsgenerated from 32fs, 48fs, 64fs, 128fs, 256fs, 384fs by internal PLL

\- Master/Slave Operation

[ADC1 Block]

\- Stereo with 6 Inputs Selector

\- DR, S/N: 96dB fs = 48kHz, when differential input

\- S/N+D: 90dB fs = 48kHz

\- Differential & Single-ended Inputs

\- Digital HPF fc=1Hz

\- 6 Analog Inputs Selector 2 differential, 4 single-ended

\- Digital Volume Control 24dB ~ -103dB, 0.5dB Step, Mute

[ADC2 Block]

\- DR, S/N: 95dB fs = 48kHz

\- Single-ended Inputs

\- Digital Volume Control 24dB ~ -103dB, 0.5dB Step, Mute

[SRC Block]

\- 3 Pair of Stereo →1 Stereo Pair Selector

\- 2ch x 1 system

\- Supporting frequency: Fin = 7.35kHz ~ 96kHz →Fout = 7.35kHz ~ 48kHz FSO/FSI = 0.167~ 6.0

[Guidance SRC Block] GSRC

\- 1 Channel 24bit Up-converter for Voice Guidance 

\- Supporting frequency: Fin = 7.35kHz ~ 12kHz →Fout = 44.1kHz or 48kHz

[DAC Block]

\- 4ch 2 Stereos

\- 24bit 128 x Over-sampling advanced multi-bit fs=8kHz~48kHz

\- DR, S/N: 108dB Differential Output

\- S/N+D: 90dB

\- Digital Volume Control 12dB ~ -115dB, 0.5dB Step, Mute

[Digital Interface Input/Output]

\- Digital Signal Input Port 4ch: 24bit MSB justified, 24/20/16bit LSB justified and I2S Format

\- Digital Signal Output Port 6ch:

24bit MSB justified, 24/16bit LSB justified and I2S Format

[Micro Computer Interface]

\- I2C or 4-wired Interface

[General]

\- Integrated PLL

\- Integrated Regulator 3.3V →1.8V 

\- Power Supply: 3.3V ± 0.3V

\- Operating Temperature Range: -40˚C ~ 85˚C

\- 80pin LQFP