AKM’s audio processors have been updated for scenarios such as listening to wireless sound at home or while driving and talking on a hands-free call. AKM introduces the new AK7735 series.

AKM has made improvements to the AK7738 which has been adopted in various in-vehicle head units for processing high resolution sound sources.  It is now more affordable with all necessary functions in the new series.  A 28-bit audio DSP supporting floating point arithmetic adopts, “VELVET SOUND”, technology established with high-end audio products.

 

The automotive grade AK7735A and the consumer grade AK7735EQ are both now available to the market.

 

Features

 

。 Making Established Dedicated DSP Audio Affordable

The AK7735 inherits essential system functions from the well-established AK7738 while making specification upgrades to the DSP core, Audio I/O, ADC and SRC.

 

The AK7735 supports 28-bit floating point arithmetic and has a parallel operation capability of 3072 steps/fs x2, (at 48kHz sampling).  In addition, the RAM is freely programmable for user applications, making it possible for various audio processing functions such as surround sound, parametric equalization, and various sound effects.  The integrated large memory eliminates the need for external program memory.  Programs are loaded into the RAM via a serial interface from a microcontroller, allowing for seamless updates.

 

。 VELVET SOUND Technology

 

Advanced 32-bit DAC’s with, “VELVET SOUND”, technology for high-end audio products are adopted for analog outputs, succeeding with high-quality playback of high-resolution sound sources.

 

。 Building a Flexible Audio System

 

The AK7735 has two stereo ADC’s, two stereo DAC’s and two asynchronous stereo SRC’s, making it possible to compose the main block of an audio system without requiring additional audio components.  The internal path connection of the AK7735 can be set freely via register setting.

 

An integrated microphone amplifier and microphone bias circuit reduce the mounting area of the printed board.  The AK7735 can also provide signals to a class-D amplifier and receive input data from external digital audio sources.  (Serial Audio Interface: 8ch input, 8ch output*.  It operates with MSB-first, LSB-first, I²S, and PCM audio data formats).

*  In TDM mode: 32ch input, 32ch output

 

Main Specifications

 

Product Name		AK7735	AK7738	AK7707
DSP	AKM Core HiFi2 Core	2 -	3 -	2 1
	MIPS	442	553	1,105
ADC		with MIC Amp 2ch (24-bit) with Input Selector 2ch (24-bit)	with MIC Amp 2ch (24-bit) with Input Selector 3ch (24-bit)	-
		Sound Color can be selected by Four Types of Digital Filters		-
DAC		4ch (32-bit)	4ch (32-bit)	-
		VELVET SOUND Technology Sound Color can be selected by Four Types of Digital Filters		-
SRC		4ch	8ch	12ch
Audio I/O	Digital Input	4ports (TDM I/F  Max 32ch)	6ports (TDM I/F  Max 24ch)	8ports (TDM I/F  Max 64ch)
	Digital Output	4ports (TDM I/F  Max 32ch)	6ports (TDM I/F  Max 28ch)	8ports (TDM I/F  Max 64ch)
DIT		-	Available	Available
DIR		-	-	Available
PLL		for Audio Clock Generation
uP I/F		I2C (400kHz/1MHz), SPI (Max : 6MHz)
Power Supply	Analog/Digital	3.0 to 3.6V
	I/F	3.0 to 3.6V
Operation Temperature		AK7735AVQ : -40 to 85°C AK7735EQ : -20 to 85°C	-40 to 85°C	-40 to 85°C
Package		48-pin LQFP	64-pin LQFP	64-pin HTQFP

 
source：http://www.akm.com/