Audio DSP. AK7750 Datasheet

AK7750 DSP. Datasheet pdf. Equivalent


AKM AK7750
[ASAHI KASEI]
[AK7750]
AK7750
Audio DSP with Built-in Hands-Free Phone Features
General Description
The AK7750 is a highly integrated Audio Digital Signal Processor with a stereo audio codec in one chip.
The AK7750 combines an on-chip DSP and an ARM7 processor that can be used to create Echo
Cancellation (EC) and Noise Cancellation (NC) functions. These functions make the AK7750 a perfect
choice for hands-free phones that require suppressing acoustic echo and noise. Voice quality and noise
suppression levels can be precisely adjusted by externally setting various parameters. Additionally, no
external Flash, ROM, or RAM is required as memories for Echo and Noise Cancellation are integrated on-
chip.
By using an external microprocessor to change algorithms, the AK7750 can be used in other audio
applications including sound field enhancements like surround, volume control, parametric equalizer and
speaker compensation. These functions are simplified by the AK7750 through the integration of 64K bit
delay data RAM, a high-performance audio Codec with sample rates from 8 KHz ~ 48 KHz, and 8-
channels of Digital Audio input / output.
What’s more, the latest Surround Decoders can be also be implemented by using the certified algorithms
from various technology partners.
Features
[DSP Block]
„ Data Word Length: 24 bit
„ Machine Cycle: 27.1 ns (fastest) (768fs at 48 KHz)
„ Number of Steps: 768 steps max. at fs = 48 KHz
4608 steps max. at fs = 8 KHz
192 steps max. at fs = 192 KHz
„ Multiply: 24 x 16 -> 40 bit (enables double precision operation)
„ Division: 24 / 24 -> 24 bit or 16 bit
„ ALU: 34 bit arithmetic operation (overflow margin 4 bits)
24 bit arithmetic & logic operations
„ Shift: 1,2,3,4,6,8,15 Bit Left Shift with indirect shift function
1,2,3,4,8,14,15 bit Right Shift with indirect shift function
„ Program RAM (PRAM): 768 words x 32 bit
„ Coefficient RAM (CRAM): 1024 words x 16 bit
„ Data RAM (DRAM): 256 words x 24 bit
„ Offset RAM (OFRAM): 48 words x 12 bit
„ Delay RAM (DLRAM): 64K bits (following 3 types are selectable):
- 1K words 24 bit
- 1K words 24 bit & 2K words 16 bit (limited pointer capability)
- 4kword 16bit
Data Compression/Expansion circuits for 16 bit data handling are integrated on-chip
(Dynamic-range: 23 bit equivalent, S/N+D: 15 bit equivalent (FS)).
- In Hands-free mode, Delay RAM cannot be used.
„ Registers: 34 bits x 4 (ACC) [for ALU]
24 bit x 8 (TMP) [for DBUS Interface]
24 bit x 6 stage stacks (PTMP) [for DBUS Interface]
„ On-chip ARM7TDMI Processor:
[MS0296-E-00]
1
2005/03


AK7750 Datasheet
Recommendation AK7750 Datasheet
Part AK7750
Description Audio DSP
Feature AK7750; [ASAHI KASEI] [AK7750] AK7750 Audio DSP with Built-in Hands-Free Phone Features General Descriptio.
Manufacture AKM
Datasheet
Download AK7750 Datasheet




AKM AK7750
[ASAHI KASEI]
[ADC Block]
„ 24 Bit 2 Channels (fs: 8 KHz ~ 48 KHz)
„ S/N+D: 91 dB (fs = 48 KHz)
„ Dynamic Range & S/N: 98 dBA (fs = 48 KHz)
„ On-chip DC offset canceling High Pass Filter
[DAC Block]
„ 24 Bit 2 Channels
„ S/N+D: 86 dB (fs = 48 KHz)
„ Dynamic Range & S/N: 98 dBA (fs = 48 KHz)
[Input/Output Digital Interface]
„ Serial Data Input 8 channels (10 channels with on-board codec.)
„ Serial Data Output 6 channels (8 channels with on-board codec.)
„ Microprocessor Interface: 1 set of inputs and outputs
[General]
„ On-chip PLL
„ On-chip EEPROM (AK6512C, AK6514C) Interface
„ Single 3.3 V +/- 0.3 V Power Supply
„ Operating Temperature Range: -40°C to +85°C
„ 64-Pin LQFP
[AK7750]
[MS0296-E-00]
2
2005/03



AKM AK7750
[ASAHI KASEI]
[AK7750]
(1) Hands-Free Mode Diagram
Block Diagram
Speaker
D/A
DSP Block
Echo
Canceller
VAD
Filter
Tel. Line
Digital
OUT(8ch)
Digital
IN(8ch)
µP
I/F
Ctrl.
VAD
D/A
voice
SW
Filter
iFFT
Spectrum
Subtraction
FFT
I/F Noise Canceller
ARM Processor
Filter
+
RAM
ROM
PLL
EEPROM
(2) Audio Surround Mode Diagram
Block Diagram
Speaker
D/A
DSP Block
Sound processing
(EQ,Surround,…)
A/D Tel. Line
A/D Mic.
A/D Audio_in
Speaker
Digital
OUT(6(8))ch)
Digital
IN(8(10))ch)
µP
I/F
D/A
voice
SW
I/F
A/D Audio_in
ROM
RAM
PLL
VAD
iFFT
Spectrum
FFT
Subtraction
Noise Canceller
ARM Processor
OFF
Block Diagram
EEPROM
[MS0296-E-00]
3
2005/03







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