[AK7756]
AK7756
DSP with Mono CODEC + Mic/Lineout Amp
GENERAL DESCRIPTION
The AK7756 is a highly integrated digital signal processor, including a mono voice audio codec, a MIC
pre-amplifier and digital audio I/F. The audio DSP has 9216step at fs = 8kHz parallel processing power.
As the AK7756 is a RAM based DSP, it is programmable for user requirements such as hands free and
acoustic effect. The AK7756EN is available in a space saving small 28pin QFN package and the
AK7756VF is available in a 30pin VSOP package.
FEATURES
DSP
- Word length: 24bit (Data RAM 24bit floating point)
- Instruction cycle: 13.6 ns (9216 steps at fs=8 kHz)
- Multiplier 20 x 20
→
36bit (double precision available)
- Divider 20 / 20
→
20bit
- ALU: 36bit arithmetic operation (with overflow margin 4bit) 24bit floating point
arithmetic and logic operation
- Program RAM: 3072 x 36bit
- Coefficient RAM: 2048 x 20bit
- Data RAM: 1024 x 24-bit (24bit floating point)
- Delay RAM: 3072 x 20bit, 3072 x 20bit
- Master Clock: 4.6MHz ~ 73.7MHz
- JX pins (Interrupt)
Audio Serial I/F
- Master / Slave operation
- Right / Left justified and I
2
S
- PCM (Short / Long Frame)
- 16bit linear, 8bit A-law, 8bit µ-law
Mono CODEC
- Sampling Rate 8KHz, 16KHz
- DAC S/N: 91dB, S/(N+D): 83dB (fs:16kHz)
- ADC S/N: 86dB, S/(N+D): 77dB (fs:16kHz)
Microphone interface
- Differential or single-ended input
- Programmable Gain (+33dB ~ +15dB and 0dB, 3dB step)
- Low Noise Microphone Bias
Automatic Power Down (CODEC, DSP)
μP
I/F : SPI, I
2
C-slave
I
2
C bootloader
Power supply
Analog (AVDD)
: 3.0V ~ 3.6V (typ.3.3V)
Digital1 (DVDD)
: 3.0V ~ 3.6V (typ.3.3V)
Digital2 (DVDD18)
: 1.7V ~ 1.9V (typ.1.8V)
Operating temperature range: -20°C ~ 85°C (AK7756EN), -40°C ~ 85°C (AK7756VF)
Package: 28pin QFN (AK7756EN)
30pin VSOP (AK7756VF)
MS1218-E-00-PB
1
2010/08
AKM [ ASAHI KASEI MICROSYSTEMS ]
