AK7712A-VT

Features:

[ DSP unit ]
  Word length: 24-bit (data RAM)
  Instruction cycle time: 54ns(maximum speed)
  Multiplier: 24 ´ 16 ® 40-bit
  Divider: 16 ¸ 16 ® 16-bit
  Program RAM: 384 ´ 32 bit
  External memory: DRAM,Pseudo-SRAM and SRAM can be connected (only use for delay data).
  Sampling frequency: 32kHz~48kHz
  Automatic clear function of external RAM:
     47msec after bringing RST high at fs=48kHz (include internal data RAM)
  Microcomputer interface:
     synchronized signal type 8-bit serial input 1 channel,
     synchronized signal type 24-bit serial output 1 channel
  Master clock: 512(511)/384(383)/256(255)fs
     The value inside ( ) is maximum calculation steps.
     512fs mode is available when 32kHz sampling is chosen.
  Conversion of master/slave mode for LRCK and BCLK:
     When master mode is selected, the outputs of LRCK and BCLK depend on the set-up for input format.
  Serial input ports(2~4ch), and output ports(2~6ch) : 16/20/24 bit words
[ ADC unit ]
  20-bit 64 ´ Oversampling DS ADC: 2ch
  S/(N+D): 92dB
  DR, S/N: 98dB
[ DAC unit ]
  20-bit 128 ´ Oversampling DS DAC: 4ch
  S/(N+D): 86dB
  DR, S/N: 97dB
  Digital HPF (fc=1Hz)
[ Total ]
  Power supply: +5V
  Package: 100pin LQFP(0.5mm pitch)

Pinout




Specifications

Parameter	Symbol	Min	Max	Unit
DC Power supply: analog power digital power(DVDD) substrate power(AVB,DVB)	VA VD VB	-0.3 -0.3 -0.3	6.0 (VB)+0.3 6.0	V V V
Input current (except power supply)	IIN	-	±10	mA
Analog input voltage AINL+,AINL-,AINR+,AINR-,VREF	VINA	-0.3	(VA)+0.3	V
Digital input voltage	VIND	-0.3	(VB)+0.3	V
Ambient temperature	Ta	-40	85	°C
Storage temperature	Tstg	-65	+150	°C

Description

The AK7712A is a DSP(Digital Signal Processor) with built-in high performance 20bit 2ch ADC and 4ch DAC, on purposeto control the sound field. It is possible to calculate 383 steps on 44.1kHz and 48kHz sampling respectively.
In case of 32kHz sampling, AK7712A  can caluculate up to 511 steps. With a combination of this LSI and external memory
for delay data,it can berealized easily to control the sound field such as Echo, Surround Presence Controller, and
Key-control which are needed forsomething like Karaoke. Parametric Equalizing can be done without external memory.