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AK4385 Schematic ( PDF Datasheet ) - AKM
| Teilenummer | AK4385 |
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| Beschreibung | 108dB 192kHz 24-Bit 2ch DAC | |
| Hersteller | AKM | |
| Logo |  |
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Gesamt 23 Seiten 
[AK4385]
AK4385
108dB 192kHz 24-Bit 2ch ΔΣ DAC
GENERAL DESCRIPTION
The AK4385 offers the perfect mix for cost and performance based audio systems. Using AKM's multi bit
architecture for its modulator the AK4385 delivers a wide dynamic range while preserving linearity for
improved THD+N performance. The AK4385 has full differential SCF outputs, removing the need for AC
coupling capacitors and 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 AK4385 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
On chip SCF
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: -94dB
Dynamic Range: 108dB
High Tolerance to Clock Jitter
Power supply: 4.75 to 5.25V
Very Small Package: 16pin TSSOP (6.4mm x 5.0mm)
AK4381 Pin Compatible
MCLK
CSN
CCLK
CDTI
LRCK
BICK
SDTI
µP
Interface
De-emphasis
Control
Clock
Divider
Audio
Data
Interface
8X
Interpolator
8X
Interpolator
ΔΣ
Modulator
ΔΣ
Modulator
SCF
SCF
VDD
VSS
DZFL
DZFR
AOUTL+
AOUTL-
AOUTR+
AOUTR-
PDN
MS0246-E-02
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2010/09
 
[AK4385]
SWITCHING CHARACTERISTICS
(Ta=25°C; VDD=4.75 ∼ 5.25V)
Parameter
Master Clock Frequency
Duty Cycle
LRCK Frequency
Symbol
fCLK
dCLK
min
2.048
40
typ
11.2896
Normal Speed Mode
fsn 8
Double Speed Mode
fsd 60
Quad Speed Mode
fsq 120
Duty Cycle
Audio Interface Timing
Duty
45
BICK Period
Normal Speed Mode
Double/Quad Speed Mode
BICK Pulse Width Low
Pulse Width High
BICK rising to LRCK Edge (Note 12)
LRCK Edge to BICK rising (Note 12)
SDTI Hold Time
SDTI Setup Time
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 “↑”
Reset Timing
PDN Pulse Width
(Note 13)
tBCK
tBCK
tBCKL
tBCKH
tBLR
tLRB
tSDH
tSDS
tCCK
tCCKL
tCCKH
tCDS
tCDH
tCSW
tCSS
tCSH
tPD
1/128fs
1/64fs
30
30
20
20
20
20
200
80
80
40
40
150
50
50
150
Notes: 12. BICK rising edge must not occur at the same time as LRCK edge.
13. The AK4385 can be reset by bringing PDN= “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
MS0246-E-02
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2010/09
6 Page 
[AK4385]
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 AK4385 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 9.
Sampling Speed
Normal Speed Mode
Double Speed Mode
Quad Speed Mode
Transition Time
1 Level
255 to 0
4LRCK
1020LRCK
8LRCK
16LRCK
2040LRCK
4080LRCK
Table 9. ATT Transition Time
MS0246-E-02
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2010/09
12 Page | ||
| Seiten | Gesamt 23 Seiten | |
| PDF Download | [ AK4385 Schematic.PDF ] | |
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