Akm's AK7736B is a highly integrated audio digital signal processing that includes internal memory for digital audio processing, such as surround effect processing, time alignment and parametric equalization. The DSP part has a word length of 24 bits, a processing speed of 8.1 ns, and a stereo called two-way SRC, including a digital input/output interface and an MCU interface. It is mainly used in car audio systems and car navigation. This article describes the main features of the AK7736B, the block diagram and evaluation board AKD7736B-A function, block diagram, layout block diagram, and circuit diagram and layout of the PCB components.
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 The data so that high accuracy IIR/FIR filter performance can 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 main features:
· 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°C ~ 85°C
· Package: 48-pin LQFP
· Evaluation Board: AKD7736B
Figure 1. AK7736B Block Diagram
Evaluation Board AKD7736B-A
The AKD7736B-A is an evaluation board for the AK7736B that is an audio processor with a 2ch SRC. This board comprises of a main board and a sub board. It is possible to control by a PC via USB port. This board has digital interfaces. Interface to digital audio systems via optical connector, ADC-Port, DAC-Port and EXT-Port.
Evaluation Board AKD7736B-A Features:
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
Figure 2. Block Diagram of the AKD7736B-A Evaluation Board
Figure 3. Block diagram of the evaluation board AKD7736B-A
Figure 4. Evaluation board AKD7736B-A circuit diagram (1)
Figure 5. Evaluation board AKD7736B-A circuit diagram (2)
Figure 6. Evaluation board AKD7736B-A circuit diagram (3)
Figure 7. Evaluation board AKD7736B-A circuit diagram (4)
Figure 8. Evaluation board AKD7736B-A circuit diagram (5)
Figure 9. Evaluation board AKD7736B-A circuit diagram (6)
Figure 10. Evaluation board AKD7736B-A circuit diagram (7)
Figure 11. Evaluation board AKD7736B-A circuit diagram (8)
Figure 12. Evaluation board AKD7736B-A circuit diagram (9)
Figure 13. Evaluation board AKD7736B-A circuit diagram (10)
Figure 14. Evaluation board AKD7736B-A layout of PCB components: top layer
Figure 15. Evaluation board AKD7736B-A layout of PCB components: bottom layer
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