[AK4137]
AK4137
32bit SRC with PCM/DSD conversion
1. General Description
The AK4137 is a 2ch digital sample rate converter (SRC). The input sample rate ranges from 8kHz to
768kHz. The output sample rate is from 8kHz to 768kHz. The AK4137 has an internal Oscillator.
Therefore it does not need any external master clocks and simplifies a system configuration. The
AK4137 is suitable for the application interfacing to different sample rates such as high-end Audio
Systems and USB-DACs. It is capable of playing back various audio formats with PCM-DSD data
conversion function.
2. Features
2 channels input/output
Asynchronous Sample Rate Converter
PCM
Input Sample Rate Range (FSI): 8kHz~768kHz
Output Sample Rate Range (FSO): 8kHz~768kHz
Input to Output Sample Rate Ratio: FSO/FSI = 1/6 ~ 24
DSD
Input Sample Rate Range (FSI): 2.8224MHz~12.288MHz
Output Sample Rate Range (FSO): 2.8224MHz~12.288MHz
Input to Output Sample Rate Ratio: FSO/FSI = 1/6 ~ 24
THD+N: Up to
−150dB
Dynamic Range: 186dB (A-weighted)
I/F format: MSB justified, LSB justified, I
2
S compatible and TDM
PCM/DSD converter
DoP I/F
Oscillator for Internal Operation Clock
Clock for Master mode: 64/128/192/256/384/512/768fso
On-chip X’tal oscillator
Digital De-emphasis Filter (32kHz, 44.1kHz, 48kHz)
Soft Mute Function
SRC Bypass mode (Master/Slave, PCM, DSD)
uP Interface: I2C bus/SPI 4-wire
Power Supply
DVDD: 3.0~3.6V (internal LDO enabled)
DVDD: 1.7~1.9V (internal LDO disabled)
Operating Temperature: Ta=
−40
~ +105°C
Package
48-pin LQFP (0.5mm pitch)
015008606-E-00
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2015/07
[AK4137]
3. Table of Contents
1.
2.
3.
4.
5.
General Description ............................................................................................................................ 1
Features .............................................................................................................................................. 1
Table of Contents ................................................................................................................................ 2
Block Diagram ..................................................................................................................................... 5
Pin Configurations and Functions ....................................................................................................... 6
■
Pin Functions..................................................................................................................................... 7
6. Absolute Maximum Ratings ...............................................................................................................11
7. Recommended Operation Conditions................................................................................................11
8. SRC Characteristics .......................................................................................................................... 12
■
PCMIN
→
PCMOUT ...................................................................................................................... 12
■
PCMIN
→
DSDOUT ...................................................................................................................... 12
■
DSDIN
→
PCMOUT ...................................................................................................................... 13
9. Power Consumptions ........................................................................................................................ 14
■
Internal LDO Mode .......................................................................................................................... 14
■
DV18 External Supply Mode ........................................................................................................... 14
10.
Filter Characteristics ...................................................................................................................... 15
■
Sharp Roll-Off Filter Characteristics ............................................................................................... 15
■
Slow Roll-Off Filter Characteristics ................................................................................................. 16
■
Short Delay Sharp Roll-Off Filter Characteristics ........................................................................... 17
■
Short Delay Slow Roll-Off Filter Characteristics ............................................................................. 18
11.
DSD Mode Characteristics ............................................................................................................ 19
■
Sharp Roll-Off Filter Characteristics ............................................................................................... 19
■
Slow Roll-Off Filter Characteristics ................................................................................................. 19
■
Short Delay Sharp Roll-Off Filter Characteristics ........................................................................... 20
■
Short Delay Slow Roll-Off Filter Characteristics ............................................................................. 20
12.
Input and Output Examples ........................................................................................................... 21
13.
DC Characteristics......................................................................................................................... 23
14.
Switching Characteristics .............................................................................................................. 23
■
Timing Diagrams ............................................................................................................................. 29
15.
Functional Descriptions ................................................................................................................. 37
■
Operation Mode and Setting ........................................................................................................... 37
■
Power-up Sequence ........................................................................................................................ 38
■
SRC Bypass Mode .......................................................................................................................... 39
■
Slave Mode ..................................................................................................................................... 41
■
Master Mode ................................................................................................................................... 41
■
X’tal Mode........................................................................................................................................ 41
■
System Clock and Audio Interface Format for Input PORT ............................................................ 42
■
System Clock for Output PORT ...................................................................................................... 46
■
Audio Interface Format for Output PORT ....................................................................................... 48
■
Cascade Connection in TDM Mode ................................................................................................ 53
■
Soft Mute Function .......................................................................................................................... 54
■
Dither Circuit.................................................................................................................................... 56
■
Digital Filter...................................................................................................................................... 57
■
De-emphasis Filter .......................................................................................................................... 57
■
Regulator ......................................................................................................................................... 57
■
DSD Mode ....................................................................................................................................... 58
■
System Reset .................................................................................................................................. 60
■
Internal Reset Function for Clock Change ...................................................................................... 61
■
When the frequency of ILRCK at input port is changed without a reset by the PDN pin or RSTN bit
.............................................................................................................................................................. 62
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[AK4137]
■
When the frequency of OLRCK at output port is changed without a reset by the PDN pin or RSTN
bit .......................................................................................................................................................... 62
■
Pop Noise Reduction in Sampling Rate Conversion ...................................................................... 63
■
Input Source Switching (PCM↔DSDI, DoP Mode) ........................................................................ 63
■
Internal Status Pin ........................................................................................................................... 63
■
Serial Control Interface ................................................................................................................... 64
■
Register Map ................................................................................................................................... 68
■
Grounding and Power Supply Decoupling ...................................................................................... 74
16.
Jitter Tolerance .............................................................................................................................. 75
17.
Recommended External Circuit .................................................................................................... 76
18.
Package ......................................................................................................................................... 78
■
Outline Dimensions ......................................................................................................................... 78
■
Material & Lead Finish .................................................................................................................... 78
■
Marking ............................................................................................................................................ 79
19.
Revision History............................................................................................................................. 79
IMPORTANT NOTICE
........................................................................................................................ 80
015008606-E-00
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2015/07
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