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PDF AK4387 Data sheet ( Hoja de datos )
| Número de pieza | AK4387 | |
| Descripción | 24-Bit 2ch DAC | |
| Fabricantes | Asahi Kasei Microsystems | |
| Logotipo |  |
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ASAHI KASEI
[AK4387]
AK4387
106dB 192kHz 24-Bit 2ch ∆Σ DAC
GENERAL DESCRIPTION
The AK4387 offers the perfect mix for cost and performance based audio systems. Using AKM's multi bit
architecture for its modulator the AK4387 delivers a wide dynamic range while preserving linearity for
improved THD+N performance. The AK4387 integrates a combination of SCF and CTF filters increasing
performance for systems with excessive clock jitter. The 24 Bit word length and 192kHz sampling rate
make this part ideal for a wide range of applications including DVD-Audio. The AK4387 is offered in a
space saving 16pin TSSOP package.
FEATURES
Sampling Rate Ranging from 8kHz to 192kHz
128 times Oversampling (Normal Speed Mode)
64 times Oversampling (Double Speed Mode)
32 times Oversampling (Quad Speed Mode)
24-Bit 8 times FIR Digital Filter
SCF with High Tolerance to Clock Jitter
Single Ended Output Buffer
Digital de-emphasis for 32k, 44.1k and 48kHz sampling
Soft mute
Digital Attenuator (Linear 256 steps)
I/F format: 24-Bit MSB justified, 24/20/16-Bit LSB justified or I2S
Master clock: 256fs, 384fs, 512fs, 768fs or 1152fs (Normal Speed Mode)
128fs, 192fs, 256fs or 384fs (Double Speed Mode)
128fs, 192fs (Quad Speed Mode)
THD+N: -90dB
Dynamic Range: 106dB
Power supply: 4.5 to 5.5V
Very Small Package: 16pin TSSOP
CSN
CCLK
CDTI
µP
Interface
MCLK
De-emphasis
Control
Clock
Divider
DVDD
AVDD
VSS
VCOM
DZF
LRCK
BICK
SDTI
Audio
ATT
8X
Interpolator
∆Σ
Modulator
SCF
LPF
Data
Interface
ATT
8X
Interpolator
∆Σ
Modulator
SCF
LPF
AOUTL
AOUTR
RSTN
MS0429-E-00
-1-
2005/09
1 page  
ASAHI KASEI
[AK4387]
DC CHARACTERISTICS
(Ta=25°C; AVDD=DVDD=4.5 ∼ 5.5V)
Parameter
Symbol
min
High-Level Input Voltage
VIH 2.2
Low-Level Input Voltage
VIL -
High-Level Output Voltage (Iout=-80µA)
VOH AVDD-0.4
Low-Level Output Voltage (Iout=80µA)
VOL
-
Input Leakage Current
Iin -
typ
-
-
-
-
max Units
-V
0.8 V
-V
0.4 V
± 10 µA
SWITCHING CHARACTERISTICS
(Ta=25°C; AVDD=DVDD=4.5 ∼ 5.5V, CL = 20pF)
Parameter
Symbol
min
typ
Master Clock Frequency
Duty Cycle
fCLK
dCLK
2.048
40
11.2896
LRCK Frequency
Normal Speed Mode
fsn 8
Double Speed Mode
fsd 60
Quad Speed Mode
fsq 120
Duty Cycle
Duty
45
Audio Interface Timing
BICK Period
Normal Speed Mode
Double/Quad Speed Mode
BICK Pulse Width Low
Pulse Width High
BICK rising to LRCK Edge (Note 11)
LRCK Edge to BICK rising (Note 11)
SDTI Hold Time
SDTI Setup Time
tBCK
tBCK
tBCKL
tBCKH
tBLR
tLRB
tSDH
tSDS
1/128fs
1/64fs
30
30
20
20
20
20
Control Interface Timing
CCLK Period
CCLK Pulse Width Low
Pulse Width High
CDTI Setup Time
CDTI Hold Time
CSN “H” Time
CSN “↓” to CCLK “↑”
CCLK “↑” to CSN “↑”
tCCK
tCCKL
tCCKH
tCDS
tCDH
tCSW
tCSS
tCSH
200
80
80
40
40
150
50
50
Reset Timing
RSTN Pulse Width
(Note 12) tPD
150
Note 11. BICK rising edge must not occur at the same time as LRCK edge.
Note 12. The AK4387 can be reset by bringing RSTN pin = “L”.
max
36.864
60
48
96
192
55
Units
MHz
%
kHz
kHz
kHz
%
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
MS0429-E-00
-5-
2005/09
5 Page 
ASAHI KASEI
[AK4387]
LRCK
BICK
(64fs)
SDTI
0123
23 24 25
31 0 1 2 3
23 24 25
31 0 1
23 22
1 0 Don’t care
23:MSB, 0:LSB
Lch Data
23 22
Figure 4. Mode 3 Timing
1 0 Don’t care
Rch Data
23
De-emphasis Filter
A digital de-emphasis filter is available for 32, 44.1 or 48kHz sampling rates (tc = 50/15µs) and is enabled or disabled
with DEM0 and DEM1. In case of double speed and quad speed mode, the digital de-emphasis filter is always off.
DEM1
0
0
1
1
DEM0
0
1
0
1
Mode
44.1kHz
OFF
48kHz
32kHz
Default
Table 8. De-emphasis Filter Control (Normal Speed Mode)
Output Volume
The AK4387 includes channel independent digital output volumes (ATT) with 256 levels at linear step including MUTE.
These volumes are in front of the DAC and can attenuate the input data from 0dB to –48dB and mute. When changing
levels, transitions are executed via soft changes; thus no switching noise occurs during these transitions. The transition
time of 1 level and all 256 levels is shown in Table 10.
Sampling Speed
Normal Speed Mode
Double Speed Mode
Quad Speed Mode
Transition Time
1 Level
255 to 0
4LRCK
8LRCK
16LRCK
1020LRCK
2040LRCK
4080LRCK
Table 9. ATT Transition Time
MS0429-E-00
- 11 -
2005/09
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet AK4387.PDF ] | |
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