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[AK4490EN]
AK4490EN
Premium 32-Bit 2ch DAC
1. General Description
The AK4490EN is a new generation Premium 32-bit 2ch DAC with new technologies, achieving industry’s
leading level low distortion characteristics and wide dynamic range. The AK4490EN integrates a
newly developed switched capacitor filter OSR Doubler, making it capable of supporting wide
range signals and achieving low out-of-band noise while realizing low power consumption. Moreover, the
AK4490EN has five types of 32-bit digital filters, realizing simple and flexible sound tuning in wide range
of applications. The AK4490EN accepts up to 768kHz PCM data and 11.2MHz DSD data, ideal for a
high-resolution audio source playback that are becoming widespread in network audios and USB-DACs.
Application: AV Receivers, CD/SACD player, Network Audios, USB DACs, USB Headphones, Sound
Plates/Bars, Measurement Equipment, Control Systems, Public Audios (PA), Smart Cellular
Phones, IC-Recorders, Bluetooth Headphones, HD Audio/Voice Conference Systems
2. Features
256x Over sampling
Sampling Rate: 30kHz 768kHz
32-bit 8x Digital Filter
- Ripple: 0.005dB, Attenuation: 100dB
- Short Delay Sharp Roll-off, GD=6.25/fs
- Short Delay Slow Roll-off, GD=5.3/fs
- Sharp Roll-off
- Slow Roll-off
- Super Slow Roll-off
High Tolerance to Clock Jitter
Low Distortion Differential Output
2.8MHz, 5.6MHz and 11.2MHz DSD Input Support
- Filter (fc=50kHz, fc=150kHz, 2.8MHz mode)
Digital De-emphasis for 32, 44.1, 48kHz sampling
Soft Mute
Digital Attenuator (255 levels and 0.5dB step + Mute)
Mono Mode
External Digital Filter Mode
THD+N: -112dB
DR, S/N: 120dB (Mono mode: 123dB)
I/F Format: 24/32bit MSB justified, 16/20/24/32bit LSB justified, I2S, DSD
Master Clock:
30kHz ~ 32kHz: 256fs, 384fs, 512fs, 768fs, 1024fs or 1152fs
30kHz ~ 54kHz: 256fs, 384fs, 512fs or 768fs
30kHz ~ 96kHz: 256fs, 384fs or 512fs
30kHz ~ 108kHz: 256fs or 384fs
108kHz ~ 192kHz: 128fs, 192fs or 256fs
108kHz ~ 216kHz: 128fs or 192fs
384kHz: 32fs, 48fs, 64fs or 96fs
768kHz: 16fs, 32fs, 48fs or 64fs
Power Supply: DVDD=AVDD=3.0 3.6V, TVDD=1.6V DVDD,
VDDL/R= VREFHL/VREFHR=4.75 5.25V
Digital Input Level: CMOS
Package: 48-pin QFN
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[AK4490EN]
3. Table of Contents
1. General Description ............................................................................................................................ 1
2. Features .............................................................................................................................................. 1
3. Table of Contents................................................................................................................................ 2
4. Block Diagram..................................................................................................................................... 4
5. Pin Configurations and Functions....................................................................................................... 5
Pin Layout .......................................................................................................................................... 5
Pin Functions...................................................................................................................................... 6
Handling of Unused Pin ..................................................................................................................... 8
6. Absolute Maximum Ratings ................................................................................................................ 9
7. Recommended Operating Conditions................................................................................................. 9
8. Electrical Characteristics................................................................................................................... 10
Analog Characteristics ..................................................................................................................... 10
Sharp Roll-Off Filter Characteristics (fs=44.1kHz) .......................................................................... 11
Sharp Roll-Off Filter Characteristics (fs=96kHz) ............................................................................. 11
Sharp Roll-Off Filter Characteristics (fs=192kHz) ........................................................................... 11
Short Delay Sharp Roll-Off Filter Characteristics (fs=44.1kHz) ...................................................... 13
Short Delay Sharp Roll-Off Filter Characteristics (fs=96kHz) ......................................................... 13
Short Delay Sharp Roll-Off Filter Characteristics (fs=192kHz) ....................................................... 13
Slow Roll-Off Filter Characteristics (fs=44.1kHz) ............................................................................ 15
Slow Roll-Off Filter Characteristics (fs=96kHz) ............................................................................... 15
Slow Roll-Off Filter Characteristics (fs=192kHz) ............................................................................. 15
Short Delay Slow Roll-Off Filter Characteristics (fs=44.1kHz) ........................................................ 17
Short Delay Slow Roll-Off Filter Characteristics (fs=96kHz) ........................................................... 17
Short Delay Slow Roll-Off Filter Characteristics (fs=192kHz) ......................................................... 17
DSD Mode Characteristics............................................................................................................... 19
DC Characteristics ........................................................................................................................... 19
Switching Characteristics................................................................................................................. 20
Timing Diagram ................................................................................................................................ 22
9. Functional Descriptions..................................................................................................................... 27
D/A Conversion Mode ...................................................................................................................... 27
System Clock ................................................................................................................................... 27
Audio Interface Format..................................................................................................................... 35
D/A Conversion Mode Switching Timing ......................................................................................... 40
De-emphasis Filter ........................................................................................................................... 41
Output Volume (PCM, DSD) ............................................................................................................ 41
Zero Detection (PCM, DSD, EX DF I/F) .......................................................................................... 42
Mono Output (PCM, DSD, EX DF I/F) ............................................................................................. 42
Sound Quality Control (PCM, DSD, Ex DF I/F) ............................................................................... 42
Characteristics (DSD) ...................................................................................................................... 43
Soft Mute Operation (PCM, DSD).................................................................................................... 44
System Reset ................................................................................................................................... 44
Power ON/OFF timing...................................................................................................................... 45
Reset Function ................................................................................................................................. 46
Synchronize Function....................................................................................................................... 48
Register Control Interface ................................................................................................................ 50
Register Map .................................................................................................................................... 55
Register Definitions .......................................................................................................................... 55
10. Recommended External Circuits................................................................................................... 61
11. Package......................................................................................................................................... 66
Outline Dimensions .......................................................................................................................... 66
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[AK4490EN]
Material & Lead finish....................................................................................................................... 66
Marking............................................................................................................................................. 67
12. Ordering Guide .............................................................................................................................. 67
Ordering Guide................................................................................................................................. 67
13. Revision History............................................................................................................................. 67
IMPORTANT NOTICE.............................................................................................................................. 68
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4. Block Diagram
[AK4490EN]
TVDD
DVDD
DVSS
PDN
BICK/DCLK/BCK
LRCK/DSDR/DINR
SDATA/DSDL/DINL
WCK
PCM
Data
Interface
Interpolator
fs=384kHz, 768kHz
DSD
Data
Interface
Normal path
DSDD bit 0
Volume pass
DSDD bit 1
DATT
Soft Mute
External
DF
Interface
AVDD
AVSS
SCF

Modulator
Bias
Vref
SCF
VSSL
VDDL
AOUTLP
AOUTLN
VCML
VREFHL
VREFLL
VREFLR
VREFLL
VCMR
AOUTRP
AOUTRN
SSLOW
CSN/SMUTE
CCLK/DEM0
CDTI/DEM1
Control
Register
Clock
Divider
CAD1/ACKS PSN DZFL/DIF0 DZFR/DIF1 CAD0/DIF2
MCLK
VDDR
VSSR
Block Diagram
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Pin Layout
5. Pin Configurations and Functions
[AK4490EN]
VCOML 37
VREFLL 38
VREFLL 39
VREFHL 40
VREFHL 41
NC 42
AVDD 43
AVSS 44
MCLK 45
DVSS 46
DVDD 47
TVDD 48
AK4490EN
Top View
24 VCOMR
23 VREFLR
22 VREFLR
21 VREFHR
20 VREFHR
19 NC
18 ACKS/CAD1
17 DEM1
16 DEM0
15 I2C
14 PSN
13 DIF2/CAD0
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