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PDF AK7757 Data sheet ( Hoja de datos )
| Número de pieza | AK7757 | |
| Descripción | 24bit 3ch ADC +4ch DAC + Mic AmpAudio DSP | |
| Fabricantes | AKM | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AK7757 (archivo pdf) en la parte inferior de esta página. Total 24 Páginas | ||
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[AK7757]
AK7757
Audio DSP with 24bit 3ch ADC + 4ch DAC + MIC Amp
GENERAL DESCRIPTION
The AK7757 is a d igital signal processor with an integrated 4ch DAC, a stereo AD C with input selector, a
mono ADC and an integrated digital au dio interface. The audio D SP has 1536 step/fs (at 48kHz sampling)
parallel arithmetic operation performance. As the AK7757 is a R AM based DSP, it is programmable for user
requirements to realize the audio e ffects process or th e proprietary high-performance HF. It is housed in a
48pin LQFP which is a small package to save the PCB space.
FEATURES
DSP
- Word length: 24bits (Data RAM: F24floating point)
- Processing Speed: 13.6 ns (9216step/fs; fs = 8kzH)
- Multiplication: 20 x20 → 36-bit Doubleprecision arithmeitc available
- Divider 20/ 20 → 20-bit
- ALU: 40-bit arithmetic operation (oevrflow margin 4bits)24-bit floatingpoint arithmetic
and logicoperation
- Program RAM: 4096 x 36bits
- CoefficientRAM: 4096 x 20bits
- Data RAM:2048 x 24bits (F24 floatnig point)
- Delay RAM: 4096 x 20bits, 4096 x 2b0its
- Master Clock: 73.7MHz
- JX pins (interrupt)
2ch ADC1
- Sampling Frequency: 8kHz~48kHz
- 3in / 1outInput Selector (Diffrentialx1single endx1 singleend with MicAmpx1)
- ADC S/N: 96dBA, S/ (N+D): 88dB
1ch ADC2
- Sampling Frequency: 8kHz~48kHz
- ADC S/N: 89dBA, S/(N+D): 82dB
4ch DAC
- Sampling Frequency: 8kHz~48kHz
- DAC S/N:107dBA, S/ (N+D): 92dB
Microphone Interface
- Differentialor single-end input
- Programmable Gain (+33dB ~ +15dB and 0d,B3dB step)
- Low Noise Microphone Bias
Automatic Power Down (CODEC, DSP)
μP I/F: SPI, I2C
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 temperaturerange: -40°C ~ 85°C
Package: 48pin LQFP
MS1489-E-02-PB -
1-
2013/07
http://www.Datasheet4U.com
1 page  
No. Pi n Name
1 AIN1L
2 INN
3
AIN
INP
4 AIN2LN
5 AIN2LP
6 AIN2RN
7 AIN2RP
8 LFLT
9 DVDD
10 D VSS
11 XTI
12 XT O
13 LRCK1
14 BICK1
15 SDIN1
SDIN2
16 JX0 I
STO O
17 RDY O
SDOUTM
18 CSN I
CAD1 I
19 SCLK I
SCL I
[AK7757]
PIN FUNCTION
I/O Function
I ADC1 Lch Single-ended Input 1 Pin.
I Microphone Inverted Differential Input Pin
I Microphne Single-ended Input Pin
I Microphone Non-inverted Differential Input Pin
I ADC1 Lch Inverted Differential Input 2 Pin
I ADC1 Lch Non-inverted Differential Input 2 Pin
I ADC1 Rch Inverted Differential Input 2 Pin
I ADC1 Rch Non-inverted Differential Input 2 Pin
R and C Components Connect Pin for PLL
O Refer to “7. LFLT Pin External Connection”. This pin outputs “L” during initial
reset.
- Digital Power Supply Pin 3.0~3.6V
- Ground Pin 0V
Crystal Oscillator Input Pin
I Connect a crystal oscillator between this pin and the XTO pin, or input an
external clock to the XTI pin.
Crystal Oscillator Output Pin
O
When a crystal oscillator is used, connect it between XTI and XTO. When an
external clock is used, leave this pin open. During initial reset, the output of this
pin is not determinable.
I
LR Channel Select Clock Pin 1
LR clock should be input to this pin in slave mode.
I
Serial Bit Clock Input Pin 1
BITCLOCK (48fs or 64fs) should be input to this pin in slave mode.
I Serial Data Input 1 Pin
I Serial Data Input 2 Pin
Conditional Jump Pin0
The conditional jump pin (JX0) is valid by setting control register (JX0E) to “1”.
Status Output Pin
This pin outputs “H” during initial reset.
Data Write Ready Output Pin for Microprocessor Interface
This pin outputs RDY.
O Serial Data Output Pin for Internal Monitoring
μP I/F Chip Select N Pin (I2CSEL pin = “L”)
When initial reset and μP I/F are not in use, leave the CSN pin High level.
I2C-bus Address 1 Pin (I2CSEL pin = “H”)
μP I/F Serial Data Clock Pin (I2CSEL pin = “L”)
Set this pin to “H” when there are no clock inputs.
I2C I/F Data Clock Pin
(I2CSEL pin= “H”)
MS1489-E-02-PB 5
2013/07
5 Page 
[AK7757]
■ DAC Characteristics
(Ta=25ºC; AVDD=DVDD=3.3V; DVDD18=1.8V, VSS=0V, BICK=64fs; Signal frequency 1kHz; Measurement
frequency = 20Hz~20kHz @fs=48kHz; in Differential Input, Unless otherwise specified.)
Parameter min
typ max Unit
DAC1
Resolution
24 Bits
DAC2
Dynamic Characteristics
S/(N+D) (0 dBFS) 0dBFS output mode 82 92
dB
-20dBFS output mode
75
85
dB
Dynamic Range
0dBFS output mode
100 107
dB
(A-weighted) (Note 11) -20dBFS output mode
80 (Note 15)
90
dB
S/N (A-weighted)
0dBFS output mode
100 107
dB
-20dBFS output mode
80 (Note 15)
90
dB
Inter-channel Isolation (f=1kHz) (Note 13) 90
110 dB
DC accuracy
Channel Gain Mismatch (Note 14)
0.0 0.7 dB
Analog output
Output Voltage
0dBFS output mode
2.0 2.2 2.4 Vp-p
-20dBFS output mode
0.2
0.22 0.24 Vp-p
Load Resistance
5 kΩ
Load Capacitance
30 pF
Note 11. S/(N+D) when -60dB FS signal is applied.
Note 13. Indicates isolation between each DAC of Lch and Rch when -1dBFS signal is applied.
Note 14. Channel gain mismatch between all output channels (DAC1L/R, DAC2L/R).
Note 15. Ta=25ºC, AVDD=DVDD=3.0~3.6V
MS1489-E-02-PB 1
1
2013/07
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet AK7757.PDF ] | |
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