AK4438 Datasheet PDF - AKM

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AK4438
AKM

Part Number AK4438
Description 108dB 768kHz 32bit 8-Channel Audio DAC
Page 30 Pages


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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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[AK4438]
3. Table of Contents
1. General Description............................................................................................................................. 1
2. Features............................................................................................................................................... 1
3. Table of Contents ................................................................................................................................ 2
4. Block Diagram and Functions ............................................................................................................. 3
5. Pin Configurations and Functions ....................................................................................................... 4
Pin Configurations.............................................................................................................................. 4
Pin Functions...................................................................................................................................... 5
Handling of Unused Pin ..................................................................................................................... 6
6. Absolute Maximum Ratings................................................................................................................. 7
7. Recommended Operation Conditions................................................................................................. 7
8. Electrical Characteristics ..................................................................................................................... 8
9. Filter Characteristics (fs=48kHz) ......................................................................................................... 9
Sharp Roll-Off Filter (SD bit = “0”, SLOW bit = “0”) ........................................................................... 9
Slow Roll-Off Filter (SD bit = “0”, SLOW bit = “1”) .......................................................................... 10
Short Delay Sharp Roll-Off Filter (SD bit = “1”, SLOW bit = “0”) ..................................................... 11
Short Delay Slow Roll-Off Filter (SD bit = “1”, SLOW bit = “1”) ....................................................... 12
10. DC Characteristics ......................................................................................................................... 13
11. Switching Characteristics............................................................................................................... 14
Timing Diagram................................................................................................................................ 17
12. Functional Descriptions.................................................................................................................. 21
System Clock ................................................................................................................................... 21
De-emphasis Filter ........................................................................................................................... 24
Audio Interface Format..................................................................................................................... 25
Digital Filter ...................................................................................................................................... 34
Zero Detection.................................................................................................................................. 34
Digital Volume Function ................................................................................................................... 35
LR Channel Output Signal Select .................................................................................................... 36
Soft Mute Operation......................................................................................................................... 38
Error Detection ................................................................................................................................. 39
System Reset................................................................................................................................... 39
Power Down Function ...................................................................................................................... 40
Power Off and Reset Functions....................................................................................................... 41
Clock Synchronization ..................................................................................................................... 45
Parallel Mode ................................................................................................................................... 47
Audio Interface ................................................................................................................................. 47
Soft Mute .......................................................................................................................................... 47
Serial Control Interface .................................................................................................................... 48
Register Map .................................................................................................................................... 52
Register Definitions .......................................................................................................................... 53
13. Recommended External Circuits ................................................................................................... 58
Typical Connection Diagram............................................................................................................ 58
14. Package ......................................................................................................................................... 61
Outline Dimensions .......................................................................................................................... 61
Material & Lead Finish ..................................................................................................................... 61
Marking............................................................................................................................................. 62
15. Ordering Guide............................................................................................................................... 62
Ordering Guide................................................................................................................................. 62
16. Revision History ............................................................................................................................. 62
IMPORTANT NOTICE............................................................................................................................ 63
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4. Block Diagram and Functions
[AK4438]
AOUTL1
AOUTR1
AOUTL2
AOUTR2
AOUTL3
AOUTR3
AOUTL4
AOUTR4
SMF
SMF
SMF
SMF
SMF
SMF
SMF
SMF
SCF
SCF
SCF
SCF
SCF
SCF
SCF
SCF

Modulator
8X
Interpolator
DATT
Soft Mute

Modulator
8X
Interpolator
DATT
Soft Mute

Modulator
8X
Interpolator
DATT
Soft Mute

Modulator
8X
Interpolator
DATT
Soft Mute
Audio
I/F
MCLK
LRCK
BICK
MCLK
LRCK
BICK
SDIN1
SDIN2
SDIN3
SDIN4
SDTI1
SDTI2
SDTI3
SDTI4
VREFL
VREFH
VSS2
AVDD
TEST
uP I/F
(I2C/SPI)
LDO
VCOM TVDD VSS1 LDOO
Figure 1. Block Diagram
CAD0_I2C/CSN/DIF
SCL/CCLK/TDM1
SDA/CDTI/TDM0
PDN
I2C
SMUTE/CAD1
PS/CAD0_SPI
DZF
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Pin Configurations
5. Pin Configurations and Functions
[AK4438]
AOUTR3
AOUTL4
AOUTR4
TEST
I2C
TVDD
VSS1
LDOO
25
26
27
28
29
30
31
32
Top View
Back TAB:Note
16
15
14
13
12
11
10
9
AOUTR1
AOUTL1
PS/CAD0_SPI
CAD0_I2C/CSN/DIF
SCL/ CCLK/TDM1
SDA/ CDTI /TDM0
SMUTE / CAD1
PDN
Figure 2. Pin Configurations
Note: The exposed pad on the bottom surface of the package must be open or connected to the analog
ground.
016001925-E-00
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2016/03



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