ASAHI KASEI
[AK4381]
MS0152-E-00
2002/5
- 1 -
GENERAL DESCRIPTION
The AK4381 offers the perfect mix for cost and performance based audio systems. Using AKM's multi bit
architecture for its modulator the AK4381 delivers a wide dynamic range while preserving linearity for
improved THD+N performance. The AK4381 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 AK4381 is offered in a space saving 16pin TSSOP package.
FEATURES
o
Sampling Rate Ranging from 8kHz to 192kHz
o
128 times Oversampling (Normal Speed Mode)
o
64 times Oversampling (Double Speed Mode)
o
32 times Oversampling (Quad Speed Mode)
o
24-Bit 8 times FIR Digital Filter
o
On chip SCF
o
Digital de-emphasis for 32k, 44.1k and 48kHz sampling
o
Soft mute
o
Digital Attenuator (Linear 256 steps)
o
I/F format: 24-Bit MSB justified, 24/20/16-Bit LSB justified or I
2
S
o
Master clock: 256fs, 384fs, 512fs or 768fs (Normal Speed Mode)
128fs, 192fs, 256fs or 384fs (Double Speed Mode)
128fs, 192fs (Quad Speed Mode)
o
THD+N: -94dB
o
Dynamic Range: 108dB
o
High Tolerance to Clock Jitter
o
Power supply: 4.75 to 5.25V
o
Very Small Package: 16pin TSSOP (6.4mm x 5.0mm)
o
AK4382A Pin Compatible
LRCK
BICK
SDTI
Audio
Data
Interface
MCLK
PDN
Modulator
AOUTL+
8X
Interpolator
SCF
AOUTR+
SCF
VDD
VSS
De-emphasis
Control
P
Interface
Clock
Divider
CSN
CCLK
CDTI
DZFR
Modulator
8X
Interpolator
AOUTL-
AOUTR-
DZFL
108dB 192kHz 24-Bit 2ch
DAC
AK4381
ASAHI KASEI
[AK4381]
MS0152-E-00
2002/5
- 2 -
n
Ordering Guide
AK4381VT -40
+85
C 16pin TSSOP (0.65mm pitch)
AKD4381 Evaluation Board for AK4381
n
Pin Layout
1
MCLK
LRCK
BICK
CSN
CCLK
CDTI
Top
View
2
3
4
5
6
7
8
DZFL
DZFR
VSS
VDD
AOUTL+
AOUTL-
AOUTR+
AOUTR-
16
15
14
13
12
11
10
9
PDN
SDTI
PIN/FUNCTION
No.
Pin Name
I/O
Function
1
MCLK
I
Master Clock Input Pin
An external TTL clock should be input on this pin.
2
BICK
I
Audio Serial Data Clock Pin
3
SDTI
I
Audio Serial Data Input Pin
4
LRCK
I
L/R Clock Pin
5
PDN
I
Power-Down Mode Pin
When at "L", the AK4381 is in the power-down mode and is held in reset.
The AK4381 should always be reset upon power-up.
6
CSN
I
Chip Select Pin
7
CCLK
I
Control Data Input Pin
8
CDTI
I
Control Data Input Pin in serial mode
9
AOUTR-
O
Rch Negative Analog Output Pin
10
AOUTR+
O
Rch Positive Analog Output Pin
11
AOUTL-
O
Lch Negative Analog Output Pin
12
AOUTL+
O
Lch Positive Analog Output Pin
13
VSS
-
Ground Pin
14
VDD
-
Power Supply Pin
15
DZFR
O
Rch Data Zero Input Detect Pin
16
DZFL
O
Lch Data Zero Input Detect Pin
Note: All input pins should not be left floating.
ASAHI KASEI
[AK4381]
MS0152-E-00
2002/5
- 3 -
ABSOLUTE MAXIMUM RATINGS
(VSS=0V; Note 1)
Parameter
Symbol
min
max
Units
Power Supply
VDD
-0.3
6.0
V
Input Current (any pins except for supplies)
IIN
-
10
mA
Input Voltage
VIND
-0.3
VDD+0.3
V
Ambient Operating Temperature
Ta
-40
85
C
Storage Temperature
Tstg
-65
150
C
Note: 1. All voltages with respect to ground.
WARNING: Operation at or beyond these limits may results in permanent damage to the device.
Normal operation is not guaranteed at these extremes.
RECOMMENDED OPERATING CONDITIONS
(VSS=0V; Note 1)
Parameter
Symbol
min
typ
max
Units
Power Supply
VDD
4.75
5.0
5.25
V
*AKM assumes no responsibility for the usage beyond the conditions in this datasheet.
ASAHI KASEI
[AK4381]
MS0152-E-00
2002/5
- 4 -
ANALOG CHARACTERISTICS
(Ta=25
C; VDD=5.0V; fs=44.1kHz; BICK=64fs; Signal Frequency=1kHz; 24bit Input Data;
Measurement frequency=20Hz
20kHz; R
L
4k
; unless otherwise specified)
Parameter
min
typ
max
Units
Resolution
24
Bits
Dynamic Characteristics (Note 3)
fs=44.1kHz
BW=20kHz
0dBFS
-60dBFS
-94
-44
-84
-
dB
dB
fs=96kHz
BW=40kHz
0dBFS
-60dBFS
-92
-41
-
-
dB
dB
THD+N
fs=192kHz
BW=40kHz
0dBFS
-60dBFS
-92
-41
-
-
dB
dB
Dynamic Range (-60dBFS with A-weighted) (Note 4)
100
108
dB
S/N (A-weighted) (Note 5)
100
108
dB
Interchannel Isolation (1kHz)
90
110
dB
Interchannel Gain Mismatch
0.2
0.5
dB
DC Accuracy
Gain Drift
100
-
ppm/
C
Output Voltage (Note 6)
2.55
2.75
2.95
Vpp
Load Resistance (Note 7)
4
k
Power Supplies
Power Supply Current (VDD)
Normal Operation (PDN = "H", fs
96kHz)
Normal Operation (PDN = "H", fs=192kHz)
Power-Down Mode (PDN = "L") (Note 8)
17
20
10
27
32
100
mA
mA
A
Notes: 3. Measured by Audio Precision (System Two). Refer to the evaluation board manual.
4. 100dB at 16bit data.
5. S/N does not depend on input bit length.
6. Full-scale voltage (0dB). Output voltage scales with the voltage of VREF,
AOUT (typ.@0dB)=(AOUT+)-(AOUT-)=
2.75Vpp VREF/5.
7. For AC-load. 4k
for DC-load.
8. All digital inputs including clock pins (MCLK, BICK and LRCK) are held VDD or VSS.
ASAHI KASEI
[AK4381]
MS0152-E-00
2002/5
- 5 -
SHARP ROLL-OFF FILTER CHARACTERISTICS
(Ta = 25
C; VDD = 4.75
5.25V; fs = 44.1kHz; DEM = OFF; SLOW = "0")
Parameter
Symbol
min
typ
max
Units
Digital filter
Passband
0.05dB (Note 9)
-6.0dB
PB
0
-
22.05
20.0
-
kHz
kHz
Stopband (Note 9)
SB
24.1
kHz
Passband Ripple
PR
0.02
dB
Stopband Attenuation
SA
54
dB
Group Delay (Note 10)
GD
-
19.3
-
1/fs
Digital Filter + SCF
Frequency Response
20.0kHz
40.0kHz
80.0kHz
fs=44.1kHz
fs=96kHz
fs=192kHz
FR
FR
FR
-
-
-
0.2
0.3
+0.1/-0.6
-
-
-
dB
dB
dB
Notes: 9. The passband and stopband frequencies scale with fs(system sampling rate).
For example, PB=0.4535fs (@
0.05dB), SB=0.546fs.
10. The calculating delay time which occurred by digital filtering. This time is from setting the 16/24bit data
of both channels to input register to the output of analog signal.
SLOW ROLL-OFF FILTER CHARACTERISTICS
(Ta = 25
C; AVDD, DVDD = 4.75~5.25V; fs = 44.1kHz; DEM = OFF; SLOW = "1")
Parameter
Symbol
min
typ
max
Units
Digital Filter
Passband
0.04dB (Note 11)
-3.0dB
PB
0
-
18.2
8.1
-
kHz
kHz
Stopband (Note 11)
SB
39.2
kHz
Passband Ripple
PR
0.005
dB
Stopband Attenuation
SA
72
dB
Group Delay (Note 10)
GD
-
19.3
-
1/fs
Digital Filter + SCF
Frequency Response
20.0kHz
40.0kHz
80.0kHz
fs=44.kHz
fs=96kHz
fs=192kHz
FR
FR
FR
-
-
-
+0/-5
+0/-4
+0.1/-5
-
-
-
dB
dB
dB
Note: 11. The passband and stopband frequencies scale with fs.
For example, PB = 0.185fs (@
0.04dB), SB = 0.888fs.
DC CHARACTERISTICS
(Ta=25
C; VDD=4.75
5.25V)
Parameter
Symbol
min
typ
max
Units
High-Level Input Voltage
Low-Level Input Voltage
VIH
VIL
2.2
-
-
-
-
0.8
V
V
High-Level Output Voltage (Iout=-80A)
Low-Level Output Voltage (Iout=80A)
VOH
VOL
VDD-0.4
-
-
-
0.4
V
V
Input Leakage Current
Iin
-
-
10
A
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