一文解析AK7736B主要特性_功能_电路图及PCB元件布局图

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描述

akm公司的AK7736B是高度集成的音频数字信号处理,包括了用于数字音像处理的内部存储器,如环绕声效果处理,时间对准和参数均衡。其DSP部分字长24位,处理速度8.1ns,立体声称两路SRC,包括数字输入/输出接口和MCU接口,主要用在汽车音频系统,汽车导航。本文介绍了AK7736B主要特性,框图和评估板AKD7736B-A功能,框图,布局框图以及电路图与PCB元件布局图。

The AK7736B is a highly integrated audio digital signal processor with integrated 2ch SRC. It includes internal memories for digital audio processing, that allows surround effect process, time alignment and parametric equalizing. Moreover, the AK7736B can process both data and filter coefficients as floating point data so that high accuracy IIR/FIR filter performance can be achieved easily. The AK7736B can operate a hands-free software by AKM as well as sound processing, by programs downloaded via the microprocessor interface.

AK7736B主要特性:

· Applications: Car Navigations, Car Audio Systems

· DSP Block

Word length: 24-bit

Processing Speed: 8.1 ns (2560step/fs; fs = 48kHz)

Step fs=48kHz: Maximum 2560 step

fs=8kHz: Maximum 15360step

fs=16kHz: Maximum 7680step

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

Divider 20 / 20 → 20-bit (floating point normalization function)

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

Shift: Multiple DBUS ±15bit Shift with indirect shifting function

Program RAM (PRAM): 6144word x 36-bit

Coefficient RAM (CRAM): 4096word x 24-bit

Data RAM (DRAM): 4096 x 24-bit (Variable Bank Size)

Offset Register (OFREG): 32word x 15-bit

Delay RAM (DLRAM): 16384kword x 24-bit

Register: 48-bit × 4 (ACC) [ALU]

24-bit × 12 (TMP) [DBUS connection]

24-bit × 6 level stack (PTMP) [DBUS connection]

· Stereo 24-bit SRC

SRC: FSI=8kHz~96kHz / FSO=8kHz~96kHz (FSO/FSI = 0.167~6.0)

· Mono 24-bit Simple SRC

FSCONV: FSI=44.1kHz~48kHz / FSO=8kHz~16kHz

· Digital Interface Input/Output

8ch Serial Data Inputs

8ch Serial Data Outputs

Sampling Frequency: 8~96kHZ

· Microcontroller Interface: SPI, I2C BUS (400kHz Fast-Mode)

· PLL

· Power Supply:

VDD 3.0~3.6V typ 3.3V (Internal Regulator)

TVDD 1.7~3.6V (1~8pin)

· Operating Temperature Range: -40℃ ~ 85℃

· Package: 48-pin LQFP

· Evaluation Board: AKD7736B

AKM

图1. AK7736B框图

评估板AKD7736B-A

The AKD7736B-A is an evaluation board for the AK7736B that is an audio processor with a 2ch SRC. This board consists of a main board and a sub board. It is possible to control by a PC via USB port. This board has digital interfaces enabling to interface with digital audio systems via optical connector, ADC-Port, DAC-Port and EXT-Port.

评估板AKD7736B-A功能:

Read/Write access to PRAM, CRAM, OFFRAM and registers of the AK7736B

Compatible with 2 types of digital audio interface

Optical input (x1) / Optical output (x1)

10-pin header (x2) and 44-pin header (x1) for interface with external data source

USB port for board control

图2. 评估板AKD7736B-A框图

图3. 评估板AKD7736B-A布局框图

图4. 评估板AKD7736B-A电路图(1)

图5. 评估板AKD7736B-A电路图(2)

图6. 评估板AKD7736B-A电路图(3)

图7. 评估板AKD7736B-A电路图(4)

图8. 评估板AKD7736B-A电路图(5)

图9. 评估板AKD7736B-A电路图(6)

图10. 评估板AKD7736B-A电路图(7)

图11. 评估板AKD7736B-A电路图(8)

图12. 评估板AKD7736B-A电路图(9)

图13. 评估板AKD7736B-A电路图(10)

图14. 评估板AKD7736B-A PCB元件布局图:顶层

图15. 评估板AKD7736B-A PCB元件布局图:底层

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