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PDF AK4523 Data sheet ( Hoja de datos )
| Número de pieza | AK4523 | |
| Descripción | 20-BIT STEREO ADC & DAC | |
| Fabricantes | Asahi Kasei Microsystems | |
| Logotipo |  |
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ASAHI KASEI
[AK4523]
AK4523
20Bit Stereo DS ADC & DAC
GENERAL DESCRIPTION
The AK4523 has a dynamic range of 100dB and is well-suited middle-range MD, surround system,
musical instruments and car audio. Signal inputs and outputs are single-ended. The DAC outputs are
analog filtered to remove out of band noise. External components are minimized.
FEATURES
o DS Stereo ADC
- 64x Oversampling
- Sample Rate Ranging from 16kHz to 48kHz
- S/(N+D): 92dB
- Dynamic range, S/N: 100dB
- Digital HPF for offset cancellation
o DS Stereo DAC
- 128x Oversampling
- Sampling Rate Ranging from 16kHz to 48kHz
- 2nd order SCF + 2nd order CTF
- Digital de-emphasis for 32kHz, 44.1kHz, 48kHz sampling
- S/(N+D): 90dB
- Dynamic Range, S/N: 100dB
- Soft Mute
o High Jitter Tolerance
o Master Clock: 256fs, 384fs, 512fs
o Analog Power Supply: 4.5 to 5.5V, Digital Power Supply: 3.0 to 5.5V
VA AGND VD DGND
CMODE
AINL+
AINL-
AINR+
AINR-
VREFH
VCOM
AOUTL
AOUTR
DS
Modulator
Decimation
Filter
HPF
Clock
Divider
DS
Modulator
Decimation
Filter
HPF
Common Voltage
Serial I/O
Interface
LPF
DS
Modulator
8x
Interpolator
LPF
DS
Modulator
8x
Interpolator
MCKI
LRCK
SCLK
SDTO
SDTI
DIF0
DIF1
SMUTE
PD DEM0 DEM1
M0021-E-03
-1-
1999/12
1 page  
ASAHI KASEI
[AK4523]
ANALOG CHARACTERISTICS
(Ta=25°C; VA, VD=5V; AGND=DGND=0V; VREFH=VA; fs=44.1kHz; SCLK=64fs;
Signal Frequency =1kHz; 20bit Data; Measurement Frequency=10Hz ~ 20kHz; unless otherwise specified)
Parameter
min typ max
ADC Analog Input Characteristics: Differential Inputs; Analog Source Impedance=470W
Resolution
20
S/(N+D)
(-0.5dB Input)
(Note 4)
84
92
DR
(-60dB Input, A-Weighted)
(Note 5)
94 100
S/N (A-Weighted)
(Note 5, 6)
94
100
Interchannel Isolation
90 110
Interchannel Gain Mismatch
0.1 0.3
Gain Drift
20
Input Voltage
(AIN=0.6 x VREFH)
(Note 7)
2.85
3.0
3.15
Input Resistance
15 25
Power Supply Rejection
(Note 8)
50
DAC Analog Output Characteristics:
Resolution
20
S/(N+D)
80 90
DR
(-60dB Output, A-Weighted) (Note 5)
94 100
S/N (A-Weighted)
Interchannel Isolation
(Note 6, 9)
94
90
100
110
Interchannel Gain Mismatch
Gain Drift
Output Voltage
(AOUT=0.58 x VREFH)
0.2 0.5
20
2.65 2.9 3.15
Load Resistance
Load Capacitance
Power Supply Rejection
(Note 8)
5
25
50
Power Supplies
Power Supply Current (VA=VD=5V)
Analog, VA PD = “H”
42 55
Digital, VD PD = “H”
10 20
Power Down PD = “L”
(Note 10)
0.4 2
Units
Bits
dB
dB
dB
dB
dB
ppm/°C
Vpp
kW
dB
Bits
dB
dB
dB
dB
dB
ppm/°C
Vpp
kW
pF
dB
mA
mA
mA
Note: 4. In case of single ended input, S/(N+D)=80dB(typ, @VA=5V).
5. In case of 16bit, DR and S/N of ADC are 98dB. DR of DAC is 98dB.
6. S/N measured by CCIR-ARM is 96dB at each converter and 94dB at ADC to DAC loopback.
7. Full scale input for each AIN+/- pin is 1.5Vpp in differential mode.
8. PSR is applied to VA, VD with 1kHz, 50mVpp. VREFH pin is held a constant voltage.
9. As the input data is “0”, S/N is 100dB regardless of resolution.
10. All digital input pins are held VD or DGND.
M0021-E-03
-5-
1999/12
5 Page 
ASAHI KASEI
[AK4523]
n Audio Serial Interface Format
Data is shifted in/out the SDTI/SDTO pins using SCLK and LRCK inputs. Four serial data modes selected by the DIF0 and
DIF1 pins are supported as shown in Table 2. In all modes the serial data has MSB first, 2’s compliment format. The data
is clocked out on the falling edge of SCLK and latched on the rising edge. For mode 3, if SCLK is 32fs, then the least
significant bits will be truncated.
Mode
0
1
2
3
DIF1
0
0
1
1
DIF0
0
1
0
1
SDTO (ADC)
20bit, MSB justified
20bit, MSB justified
20bit, MSB justified
IIS (I2S)
SDTI (DAC)
16bit, LSB justified
20bit, LSB justified
20bit, MSB justified
IIS (I2S)
L/R SCLK (Slave)
H/L ³ 32fs
H/L ³ 40fs
H/L ³ 40fs
L/H 32fs or ³ 40fs
Table 2. Serial Data Modes
LRCK(i)
0 1 23
SCLK(i:32fs)
9 10 11 12 13 14 15 0 1 2
SDTO(o)
19 18 17
11 10 9 8 7 6 5 4 19 18 17
9 10 11 12 13 14 15 0 1
11 10 9 8 7 6 5 4 19
SDTI(i)
15 14 13
7 6 5 4 3 2 1 0 15 14 13
7 6 5 4 3 2 1 0 15
0 1 23
SCLK(i:64fs)
SDTO(o)
19 18 17
17 18 19 20
3 21 0
30 31 0 1 2 3
17 18 19 20
19 18 17
3210
31 0 1
19
SDTI(i)
Don’t Care 15 14 13 12 11 2 1 0 Don’t Care
SDTO-19:MSB, 0:LSB; SDTI-15:MSB, 0:LSB
Lch Data
Figure 1. Mode 0 Timing
15 14 13 12 11 2 1 0
Rch Data
LRCK(i)
012
SCLK(i:64fs)
12 13 14
20 21
31 0 1 2
12 13 14
20 21
31 0 1
SDTO(o)
19 18
876
0
19 18
876
0
19
SDTI(i)
Don’t Care 19 18
12 11
19:MSB, 0:LSB
Lch Data
1 0 Don’t Care
Figure 2. Mode 1 Timing
19 18
12 11
Rch Data
10
M0021-E-03
- 11 -
1999/12
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet AK4523.PDF ] | |
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