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PDF AK4525 Data sheet ( Hoja de datos )
| Número de pieza | AK4525 | |
| Descripción | 20-BIT STEREO ADC & DAC | |
| Fabricantes | Asahi Kasei Microsystems | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AK4525 (archivo pdf) en la parte inferior de esta página. Total 18 Páginas | ||
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ASAHI KASEI
[AK4525]
AK4525
20Bit Stereo ∆Σ ADC & DAC with X’ tal Osc
GENERAL DESCRIPTION
The AK4525 has a dynamic range of 100dB and is well-suited middle-range MD, surround system,
musical instruments and car audio. Analog inputs are full-differential with single-end capability. Analog
outputs are single-ended. The AK4525 has X’ tal oscillation circuit and master mode.
FEATURES
o ∆Σ Stereo ADC
- 64x Oversampling
- Sample Rate Ranging from 32kHz to 48kHz
- S/(N+D): 92dB
- Dynamic range, S/N: 100dB
- Digital HPF for offset cancellation
o ∆Σ Stereo DAC
- 128x Oversampling
- Sampling Rate Ranging from 32kHz 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 X’ tal Oscillation circuit
o Master/Slave Mode
o Analog Power Supply: 4.5 to 5.5V, Digital Power Supply: 3.1 to 5.5V
VA AGND VD DGND
CMODE
AINL+
AINL-
AINR+
AINR-
VREFH
VCOM
AOUTL
AOUTR
∆Σ
Modulator
Decimation
Filter
HPF
∆Σ
Modulator
Decimation
Filter
HPF
Clock
Gen &
Divider
Common Voltage
Serial I/O
Interface
LPF
∆Σ
Modulator
8x
Interpolator
LPF
∆Σ
Modulator
8x
Interpolator
MCKO
XTI
XTO
LRCK
SCLK
SDTO
SDTI
DIF0
DIF1
SMUTE
M/S
PDN
DEM0 DEM1
MS0053-E-00
-1-
2000/9
1 page  
ASAHI KASEI
[AK4525]
ANALOG CHARACTERISTICS
(Ta=25°C; VA, VD=5.0V; 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 Units
ADC Analog Input Characteristics: Differential Inputs; Analog Source Impedance=470Ω
Resolution
20 Bits
S/(N+D)
(-0.5dB Input)
(Note 4)
84
92
dB
DR
(-60dB Input, A-Weighted)
(Note 5)
94
100
dB
S/N (A-Weighted)
(Note 5, 6)
94
100
dB
Interchannel Isolation
90 110
dB
Interchannel Gain Mismatch
0.1 0.3 dB
Gain Drift
20 ppm/°C
Input Voltage (AIN=0.6 x VREFH)
(Note 7)
2.85
3.0
3.15 Vpp
Input Resistance
15 25
kΩ
Power Supply Rejection
(Note 8) 50 dB
DAC Analog Output Characteristics:
Resolution
20 Bits
S/(N+D)
80 90
dB
DR
(-60dB Output, A-Weighted) (Note 5)
94
100
dB
S/N (A-Weighted)
(Note 6, 9)
94
100
dB
Interchannel Isolation
90 110
dB
Interchannel Gain Mismatch
0.2 0.5 dB
Gain Drift
20 - ppm/°C
Output Voltage (AOUT=0.58 x VREFH)
2.65 2.9 3.15 Vpp
Load Resistance
5 kΩ
Load Capacitance
25 pF
Power Supply Rejection
(Note 8) 50 dB
Power Supplies
VA=VD=5V
Analog, VA
PDN= “H”
40 55 mA
Digital, VD
PDN= “H”
12 20 mA
Power Down
PDN= “L”
(Note 10)
6 12 mA
Notes: 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. X’tal circuit is oscillating and all digital input pins are held VD or DGND.
MS0053-E-00
-5-
2000/9
5 Page 
ASAHI KASEI
[AK4525]
LRCK(i)
01 2
SCLK(i:64fs)
17 18 19 20 21
01 2
17 18 19 20 21
01
SDTO(o)
19 18
3 210
19 18
3210
19
SDTI(i)
19 18
3210
19:MSB, 0:LSB
Lch Data
Don’t Care
23 22
Figure 4. Mode 2 Timing
32 10
Don’t Care
Rch Data
19
LRCK(i)
01 23
SCLK(i:32fs)
SDTO(o)
SDTI(i)
4 19 18
01 23
SCLK(i:64fs)
9 10 11 12 13 14 15 0 1 2
12 11 10 9 8 7 6 5 4 19 18
17 18 19 20 21
31 0 1 2 3
9 10 11 12 13 14 15 0 1
12 11 10 9 8 7 6 5 4
17 18 19 20 21
31 0 1
SDTO(o)
19 18
4 3210
19 18
43 2 10
SDTI(i)
19 18
4 3 2 1 0 Don’t Care 19 18
19:MSB, 0:LSB
Lch Data
Figure 5. Mode 3 Timing
4 3 2 1 0 Don’t Care
Rch Data
n Digital High Pass Filter
The ADC of AK4525 has a digital high pass filter for DC offset cancel. The cut-off frequency of the HPF is 0.9Hz at
fs=44.1kHz and also scales with sampling rate (fs).
MS0053-E-00
- 11 -
2000/9
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet AK4525.PDF ] | |
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