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PDF AK7756 Data sheet ( Hoja de datos )
| Número de pieza | AK7756 | |
| Descripción | DSP | |
| Fabricantes | AKM | |
| Logotipo |  |
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[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 I2S
- 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, I2C-slave
I2C 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
1 page  
■ DSP Block Diagram
CP0, CP1
DP0, DP1
CRAM
2048w x 20-Bit
DRAM
512w × 24-Bit
512w × 24-Bit
CBUS(20-Bit)
DBUS(24-Bit)
MPX20
MPX20
X
Multiply
20 x 20 → 36-Bit
Y
36-Bit
24-Bit
40-Bit
MUL DBUS
SHIFT
40-Bit
AB
ALU
40-Bit
Overflow Margin: 4-Bit
40-Bit
DR0 ∼ 3
40-Bit
Over Flow Data
Generator
Division 20÷20→20 Peak Detector
[AK7756]
DLP0, DLP1
DLRAM
3072w x 20-Bit
3072w x 20-Bit
DLRAM
Address
Pointer
OFREG
32w x 13-Bit
µP I/F
Control
Serial I/F
DEC
PRAM
3072w x 36-Bit
PC
Stack: 5 level(max)
TMP 12 x 24-Bit
PTMP(LIFO) 6 x 24-Bit
1 x 24-Bit
2 x 24-Bit
DIN2 (ADC or SDIN2 pin)
DIN1
1 x 24-Bit
2 x 24-Bit
2 x 24-Bit
DOUT3 (DAC or SDOUT3pin)
DOUT2
DOUT1
MS1218-E-00-PB
5
2010/08
5 Page 
[AK7756]
■ DAC Characteristics
(Ta=25ºC; AVDD=DVDD=3.3V, DVDD18=1.8V; VSS1=VSS2=0V; BICK=64fs; Signal frequency 1 kHz;
Measurement frequency=20Hz~8 kHz, fs=16 kHz, CKM mode 6, unless otherwise specified.)
Parameter
min typ max
Mono Resolution
24
DAC Dynamic Characteristics; Mono DAC→AOUT pin
S/(N+D)
(0dBFS)
75 83
S/N 83 91
Analog Output
Full-scale Output Voltage (Note 12)
2.09 2.2 2.31
Load Resistance
10
Load Capacitance
30
Note 12. Full scale output voltage. The output voltage is proportional to AVDD. Vout=0.67 x AVDD (typ.)
Unit
Bits
dB
dB
Vpp
kΩ
pF
MS1218-E-00-PB
11
2010/08
11 Page | ||
| Páginas | Total 27 Páginas | |
| PDF Descargar | [ Datasheet AK7756.PDF ] | |
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