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PDF AK7754 Data sheet ( Hoja de datos )
| Número de pieza | AK7754 | |
| Descripción | Audio DSP | |
| Fabricantes | AKM | |
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[AK7754]
AK7754
Audio DSP with Stereo CODEC + MIC/HP-AMP
GENERAL DESCRIPTION
The AK7754 is a highly integrated audio digital signal processor (DSP) with two Audio I/F’s, Microphone and
Headphone Amplifier. The audio DSP has 1536step/fs (at 48KHz sampling) parallel processing power, and
AKM’s original Hands-free technology provides high performance noise and echo cancelling. The 96k-bit
delay memory allows surround processing, acoustic effect and parametric equalizers. As the AK7754 is a
RAM based DSP, it is programmable for user requirements. The internal SRC has various sampling rate
converting modes, corresponds many sampling rates without changing the DSP operating sampling
frequency. The AK7754 is available in a space saving small 48pin QFN package.
FEATURES
□ DSP Block
- Word length: 24bit (Coefficient RAM & Data RAM: F24 floating point)
- Processing Speed: 13.6 ns (1536step/fs fs=48kHz; 9216step/fs fs=8kHz)
- Multiplication: 20 x 16 → 36-bit Double precision arithmetic available
- Divider 20 / 20 → 20bit
- ALU: 40bit arithmetic operation (overflow margin 4bit) 24bit floating point arithmetic
and logic operation
- Program RAM: 2048 x 36bit
- Coefficient RAM: 2048 x 16bit (F24 floating point)
- Data RAM: 512 x 24-bit (F24 floating point)
- Offset Register: 32 x 12bit
- Delay RAM1: 3072 x 24bit
- Delay RAM2: 2048 x 12bit
- Sampling rate: fs= 8.0k ~ 48kHz
- Master/Slave Operation
- Master Clock: 1536fs
(generated from 32fs, 48fs, 64fs, 128fs, 256fs, 384fs by internal PLL)
□ Two Digital Interfaces (I/F 1, I/F 2)
- Digital Signal Input Port (4ch) MSB justified 24bit/LSB justified 24/20/16bit and I2S
- Digital Signal Input Port (6ch) MSB justified 24bit/ LSB justified 20/16bit and I2S
- Short / Long Frame
-24 bit linear, 8 bit A-law, 8 bit µ-law
□ Stereo 24bit ADC Block
- Sampling rate: 8 ~ 48kHz
- ADC Characteristics S/(N+D): 82dB ,DR, S/N: 89dB
- Three Analog Input Selectors (Differential, Single-ended Inputs)
- Channel Independent MIC, Analog Line Gain Amp (0dB, 9dB~27dB, 3dBstep)
- Channel Independent Digital Volume (24dB ~ -103dB, 0.5dB Step, Mute)
- Integrated DC offset canceling High Pass Filter
□ Digital Microphone I/F
MS1138-E-01-PB
-1-
2012/03
1 page  
■ Ordering Guide
AK7754EN
AKD7754
■ Pin Layout (TBD)
-20 ∼ +85°C
48pin QFN (0.5mm pitch)
Evaluation Board for AK7754
[AK7754]
OUTL/OUTP
AVDD
VSS4
VCOM
MPRF
MPWR
IN1R/ IN2P
I N1L/ IN1P
IN2 R/IN2 N
IN2 L/IN 1N
IN3R/ DMDA T
I N3L/ DMCLK
37
38
39
40
41
42
43
44
45
46
47
48
AK7754EN
Top View
24 RDY/SDOUTM
23 RDY
22 SDA
21 SCL
20 CAD0
19 CAD1
18 LRCK2/JX0
17 BICK2/JX1
16 SDIN2/JX2
15 SDOUT2
14 SDOUT1
13 CLKO
MS1138-E-01-PB
5
2012/03
5 Page 
[AK7754]
■ DAC Characteristics
(Ta=25ºC; AVDD=DVDD=HVDD=3.3V, DVDD18=1.8V; VSS1=VSS2=VSS3=VSS4=0V; BICK1=64fs; Signal
frequency 1kHz; Measurement frequency=20Hz~20kHz, fs=48kHz, PMSRC=PMHPL=PMHPR bits = “0”, CKM mode
6 (CKM[2:0]=6h, Unless otherwise specified.)
Parameter
min typ max Unit
Stereo Resolution
24 Bits
DAC Dynamic Characteristics; Stereo DAC→OUTL/R pins VOLDAL/R=18h(0dB) LODIF=“0”
S/(N+D)
(0dBFS)
80 91
dB
Dynamic Range (A-weight)
88 96
dB
S/N (A-weight)
88 96
dB
Inter-Channel Isolation (fin=1kHz) (Note 14)
90 110
dB
DC accuracy
Channel Gain Mismatch
0.0 0.5 dB
Analog Volume Characteristics
Gain Amount
Min
Max
0.0 dB
28.0 dB
Step width
2.0 dB
Analog Output
Output Voltage
Single-End
2.06 2.17 2.28 Vpp
(Note 15)
Differential
±2.06
±2.17
±2.28
Vpp
Load Resistance
10 kΩ
Load Capacitance
30 pF
Note 14. Inter-channel isolation between Lch and Rch of the DAC.
Note 15. Full scale output voltage. The output voltage is proportional to AVDD. Vout=0.67 x AVDD (typ.)
MS1138-E-01-PB
11
2012/03
11 Page | ||
| Páginas | Total 26 Páginas | |
| PDF Descargar | [ Datasheet AK7754.PDF ] | |
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