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PDF AK4522 Data sheet ( Hoja de datos )
| Número de pieza | AK4522 | |
| 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 AK4522 (archivo pdf) en la parte inferior de esta página. Total 19 Páginas | ||
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ASAHI KASEI
[AK4522]
AK4522
20Bit Stereo ΔΣ ADC & DAC
GENERAL DESCRIPTION
The AK4522 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. The AK4522 is available
in a small 24pin SSOP package, which will reduce system space.
FEATURES
• ΔΣ Stereo ADC
- 64x Oversampling
- Sampling Rate Ranging from 16kHz to 48kHz
- S/(N+D): 92dB
- Dynamic Range, S/N: 100dB
- Digital HPF for offset cancellation
• ΔΣ 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
• High Jitter Tolerance
• Master Clock: 256fs, 384fs, 512fs
• Analog Power Supply: 4.5 to 5.5V, Digital Power Supply: 2.7 to 5.5V
• Small SSOP Package: 24pin SSOP
VA AGND VD DGND
CMODE
AINL+
AINL-
AINR+
AINR-
VREFH
VCOM
AOUTL
AOUTR
ΔΣ
Modulator
Decimation
Filter
HPF
ΔΣ
Modulator
Decimation
Filter
HPF
Clock
Divider
MCKI
LRCK
SCLK
Common Voltage
Serial I/O
Interface
LPF
ΔΣ
Modulator
8x
Interpolator
LPF
ΔΣ
Modulator
8x
Interpolator
SDTO
SDTI
DIF0
DIF1
SMUTE
PD DEM0 DEM1
M0020-E-03
-1-
2013/01
1 page  
ASAHI KASEI
[AK4522]
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=470Ω
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
20 30
Power Supply Rejection
(Note 8)
50
DAC Analog Output Characteristics:
Resolution
20
S/(N+D)
80 90
DR (-60dB Output, A-Weighted)
(Note 5) 95 100
S/N (A-Weighted)
(Note 6, 9)
95
100
Interchannel Isolation
90 110
Interchannel Gain Mismatch
0.2 0.5
Gain Drift
20
Output Voltage
(AOUT=0.6 x VREFH)
2.65 2.9 3.15
Load Resistance
5
Load Capacitance
25
Power Supply Rejection
(Note 8)
50
Power Supplies
Power Supply Current (VA=VD=5V)
Analog, VA PD =”H”
42 55
Digital, VD PD =”H”
10 20
Units
Bits
dB
dB
dB
dB
dB
ppm/°C
Vpp
kΩ
dB
Bits
dB
dB
dB
dB
dB
ppm/°C
Vpp
kΩ
pF
dB
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.
M0020-E-03
-5-
2013/01
5 Page 
ASAHI KASEI
[AK4522]
De-emphasis Filter
The DAC of AK4522 includes the digital de-emphasis filter (tc=50/15us) by IIR filter. This filter corresponds to three
frequencies (32kHz, 44.1kHz, 48kHz). The de-emphasis filter selected by DEM0 and DEM1 is enabled for input audio
data. The de-emphasis is also disabled at DEM0=”1” and DEM1=”0”.
DEM1
0
0
1
1
DEM0
0
1
0
1
Mode
44.1kHz
OFF
48kHz
32kHz
Table 3. De-emphasis filter control
Soft Mute Operation
Soft mute operation is performed at digital domain. When SMUTE goes to “H”, the output signal is attenuated by -∞
during 1024 LRCK cycles. When SMUTE is returned to “L”, the mute is cancelled and the output attenuation gradually
changes to 0dB during 1024 LRCK cycles. If the soft mute is cancelled within 1024 LRCK cycles after starting the
operation, the attenuation is discontinued and returned to 0dB. The soft mute is effective for changing the signal source
without stopping the signal transmission.
S M U TE
0dB
A tten u ation
-∞
1 0 2 4 /fs
(1)
GD
(2)
1 0 2 4 /fs
GD
(3)
Noise level
-1 0 0 d B
Notes:
(1) The output signal is attenuated by -∞ during 1024 LRCK cycles (1024/fs).
(2) Analog output corresponding to digital input has the group delay (GD).
(3) If the soft mute is cancelled within 1024 LRCK cycles, the attenuation is discontinued and returned to 0dB.
Figure 5. Soft Mute Operation
M0020-E-03
- 11 -
2013/01
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet AK4522.PDF ] | |
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