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PDF AK4438 Data sheet ( Hoja de datos )
| Número de pieza | AK4438 | |
| Descripción | 108dB 768kHz 32bit 8-Channel Audio DAC | |
| Fabricantes | AKM | |
| Logotipo |  |
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[AK4438]
AK4438
108dB 768kHz 32bit 8-Channel Audio DAC
1. General Description
The AK4438 is an 8-channel 32-bit DAC which corresponds to digital audio systems. An internal circuit
includes newly developed 32-bit Digital Filter achieving short group delay and high quality sound. It
corresponds to a 768kHz PCM input at maximum, suitable for play backing high resolution audio sources
that are becoming widespread in network audios, USB-DACs and Car Audio Systems. In addition,
“OSR-Doubler” technology is newly adopted, making the AK4438 capable of supporting wide range
signals and achieving low out-of-band noise while realizing low power consumption. Moreover, the
AK4438 has five types of 32-bit digital filters, realizing simple and flexible sound making in wide range of
applications.
Application: AV Receivers, CD/SACD Players, Network Audios, USB DACs, USB Headphones, Sound
Plate/Bars, Car Audios, Automotive External Amplifiers, Measuring Instruments and Control
Systems.
2. Features
1. 8ch 32bit DAC
- 256 x Over sampling
- 32-bit High Quality Sound Short Delay Digital Filter
- Single-ended Output, Smoothing Filter
- THD+N: 91dB
- DR, S/N: 108dB
- Channel Independent Digital Volume Control (0dB～-127dB, 0.5dB Step, Mute)
- Soft Mute
- De-emphasis Filter (supporting 32kHz, 44.1kHz and 48kHz)
- I/F Format: MSB justified, LSB justified, I2S, TDM
- Zero Detection
2. Sampling Frequency
- Normal Speed Mode: 8kHz to 48kHz
- Double Speed Mode: 48kHz to 96kHz
- Quad Speed Mode: 96kHz to 192kHz
- Oct Speed Mode: 384kHz
- Hex Speed Mode: 768kHz
3. Master Clock
256fs, 384fs or 512fs, 768fs (Normal Speed Mode: fs=8kHz 48kHz)
256fs, 384fs
(Double Speed Mode: fs=48kHz 96kHz)
128fs, 192fs
(Quad Speed Mode: fs=96kHz 192kHz)
64fs, 96fs
(Oct Speed Mode: fs=384kHz)
32fs, 48fs
(Hex Speed Mode: fs=768kHz)
4. P Interface: 3-wire Serial/ I2C bus (Ver 1.0, 400kHz mode)
5. Power Supply
- Analog Supply: AVDD = 3.0 3.6V
- In/Output Buffer: TVDD = 1.7 3.6V
- Integrated LDO for Digital Power Supply
8. Power Consumption: 31mA (fs=48kHz)
9. Operating Temperature: Ta = - 40 105℃
10. Package: 32-pin QFN(0.5mm pitch)
016001925-E-00
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2016/03
1 page  
[AK4438]
■ Pin Functions
No. Pin Name I/O PD state Function
1 MCLK
2 BICK
3 LRCK
4 SDTI1
5 SDTI2
6 SDTI3
7 SDTI4
8 DZF
9 PDN
I Hi-z External Master Clock Input Pin
I Hi-z Audio Serial Data Clock Pin
I Hi-z Input Channel Clock Pin
I Hi-z Audio Serial Data Input
I Hi-z Audio Serial Data Input
I Hi-z Audio Serial Data Input
I Hi-z Audio Serial Data Input
O 50kΩ Zero Input Detect in I2C Bus or 3-wire serial control mode
Pull-down
Power-Down & Reset Pin.
I Hi-z When “L”, the AK4438 is powered-down and the control registers are reset to
default state.
Soft Mute Pin in Parallel control mode.
10 SMUTE
I
Hi-z
When this pin is changed to “H”, soft mute cycle is initiated. When returning
“L”, the output mute releases.
CAD1
SDA
I
I/O
Chip Address 1 Pin in I2C Bus or 3-wire serial control mode
Control Data Input Pin in I2C Bus serial control mode
11 CDTI
I Hi-z Control Data Input Pin in 3-wire serial control mode
TDM0
SCL
I
I
TDM Mode select pin in Parallel control mode.
Control Data Clock Pin in I2C Bus serial control mode
12 CCLK
I Hi-z Control Data Clock Pin in 3-wire serial control mode
TDM1
I
CAD0_I2C I
TDM Mode select pin in Parallel control mode.
Chip Address 0 Pin in I2C Bus serial control mode
13 CSN
DIF
I
I
14 PS
I
CAD0_SPI I
Hi-z
Chip Select Pin in 3-wire serial control mode
Audio Data Format Select in Parallel control mode.
“L”: 32bit MSB, “H”: 32bit I2S
(I2C pin = “H”) Control Mode Select Pin
Hi-z “L”: I2C Bus serial control mode, “H”: Parallel control mode.
(I2C pin = “L”) Chip Address 0 Pin in 3-wire serial control mode
15 AOUTL1 O
Hi-z Lch Analog Output Pin
16 AOUTR1 O
Hi-z Rch Analog Output Pin
17 AOUTL2 O
Hi-z Lch Analog Output Pin
18 AOUTR2 O
Hi-z Rch Analog Output Pin
19 VREFH
- Hi-z Positive Voltage Reference Input Pin, AVDD
20 VREFL
21 VCOM
- Hi-z Negative Voltage Reference Input Pin, VSS2
O
500Ω
Pull-down
Common Voltage Output Pin, AVDDx1/2
Large external capacitor around 2.2µF is used to reduce power-supply noise.
22 VSS2
- - Analog Ground Pin
23 AVDD - - Analog Power Supply Pin, 3.0V3.6V
24 AOUTL3 O
Hi-z Lch Analog Output Pin
25 AOUTR3 O
Hi-z Rch Analog Output Pin
26 AOUTL4 O
Hi-z Lch Analog Output Pin
27 AOUTR4
28 TEST
O Hi-z Rch Analog Output Pin
-
25kΩ This pin must be connected to VSS1.
Pull-down
29 I2C
Control Mode Select Pin
I Hi-z “L”: 3-wire serial control mode
“H”: I2C Bus serial control mode or Parallel control mode.
30 TVDD - - Digital Power Supply Pin, 1.7V3.6V
31 VSS1
32 LDOO
- - Digital Ground Pin
O 580Ω LDO Output Pin.
Pull-down This pin must be connected to ground with 2.2uF ±50%.
Note 1. All digital input pins must not be allowed to float.
016001925-E-00
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2016/03
5 Page 
[AK4438]
■ Short Delay Sharp Roll-Off Filter (SD bit = “1”, SLOW bit = “0”)
fs=44.1kHz
Parameter
Digital Filter
Passband
(Note 11)
0.05dB
3.0dB
Passband Ripple
(Note 12)
Stopband
(Note 11)
Stopband Attenuation
(Note 14)
Group Delay
(Note 13)
Digital Filter + SCF + SMF (Note 14)
Frequency Response : 0 20.0kHz
Symbol
PB
PB
PR
SB
SA
GD
Min.
0
-0.0031
24.1
80
-
-0.26
Typ.
21.5
5.8
fs=96kHz
Parameter
Digital Filter
Passband
(Note 11)
0.05dB
3.0dB
Passband Ripple
(Note 12)
Stopband
(Note 11)
Stopband Attenuation
(Note 14)
Group Delay
(Note 13)
Digital Filter + SCF + SMF (Note 14)
Frequency Response : 0 20.0kHz
Symbol
PB
PB
PR
SB
SA
GD
Min.
0
-0.0031
52.5
80
-
-0.53
Typ.
46.8
0
5.8
fs=192kHz
Parameter
Digital Filter
Passband
(Note 11)
0.05dB
3.0dB
Passband Ripple
(Note 12)
Stopband
(Note 11)
Stopband Attenuation
(Note 14)
Group Delay
(Note 13)
Digital Filter + SCF + SMF (Note 14)
Frequency Response : 0 20.0kHz
Symbol
PB
PB
PR
SB
SA
GD
Min.
0
-0.0031
105
80
-
-1.9
Typ.
93.6
5.8
Max.
20.0
0.0031
-
0.1
Max.
43.5
0.0031
-
0.1
Max.
87.0
0.0031
-
0.1
Unit
kHz
kHz
dB
kHz
dB
1/fs
dB
Unit
kHz
kHz
dB
kHz
dB
1/fs
dB
Unit
kHz
kHz
dB
kHz
dB
1/fs
dB
016001925-E-00
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2016/03
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet AK4438.PDF ] | |
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