ASAHI KASEI
[AK4124]
MS0288-E-01
2004/08
- 1 -
GENERAL DESCRIPTION
AK4124 is a stereo digital sample rate converter (SRC). The input sample rate ranges from 8kHz to
216kHz. The output sample rate is from 8kHz to 216kHz. By using the AK4124, the system can take very
simple configuration because the AK4124 has an internal PLL and does not need any master clock at
slave mode. Then the AK4124 is suitable for the application interfacing to different sample rates like
high-end Car Audio, DVD recorder, etc.
FEATURES
1. SRC
Asynchronous Sample Rate Converter
Input Sample Rate Range (fsi) : 8kHz
216kHz
Output Sample Rate (fso) : 8kHz
216kHz
Input to Output Sample Rate Ratio : 1/6 to 6
THD+N :
-
130dB
Dynamic Range : 140dB (A-weighted)
I/F format : MSB justified, LSB justified and I
2
S compatible
PLL for Internal Operation Clock
Clock for Master mode : 128/192/256/384/512/768fsi, 128/192/256/384/512/768fso
SRC Bypass mode
Soft Mute Function
2. Power Supply
AVDD, DVDD: 3.0
3.6V (typ. 3.3V)
3. Ta =
-
40
85
C
4. Package : 30pin VSOP
PLL
PDN
SMUTE
OLRCK
OBICK
SDTO
OMCLK
Serial
Audio
I/F
SRC
Serial
Audio
I/F
ILRCK
SDTI
IBICK
PLL1
PLL2
IDIF2 IDIF1 IDIF0
ODIF1 ODIF0
OBIT1
OBIT0
UNLOCK
IMCLK
AVDD AVSS DVDD DVSS
CMODE2 CMODE1 CMODE0
PLL0
DITHER
192kHz / 24Bit High Performance Asynchronous SRC
AK4124
ASAHI KASEI
[AK4124]
MS0288-E-01
2004/08
- 2 -
Ordering Guide
AK4124VF
-40 +85C
30pin
VSOP
(0.65mm
pitch)
AKD4124 Evaluation
Board
for
AK4124
Pin Layout
PDN
SMUTE
ILRCK
IBICK
FILT
AVSS
DITHER
PLL2
IDIF0
IDIF1
IDIF2
PLL0
PLL1
SDTI
Top View
8
7
6
5
4
3
2
1
23
24
25
26
27
28
29
30
DVDD
OMCLK
SDTO
OBICK
OLRCK
DVSS
AVDD
9
10
11
12
13
14
20
21
22
CMODE2
17
18
19
OBIT1
IMCLK
CMODE0
ODIF0
ODIF1
CMODE1
16
OBIT0
UNLOCK
15
ASAHI KASEI
[AK4124]
MS0288-E-01
2004/08
- 3 -
Compatibility with AK4121
AK4124
AK4121
Pin 5
DITHER
DEM0
Pin 6
PLL2
DEM1
THD+N
-130dB
-113dB
D-Range (A-weighted)
140dB
117dB
Gain between Input and Output Signal
-0.01dB (typ)
-0.2dB (typ)
fs
8kHz
216kHz
8kHz
96kHz
Master mode for Input PORT
Yes
No
MCLK for Master mode (Input PORT)
128/192/256/384/512/768fsi
No
MCLK for Master mode (Output PORT)
128/192/256/384/512/768fso
256/384/512/768fso
Output Data Length
16/18/20/24 bit
16/20 bit
De-emphasis Filter
No
Yes (32k/44.1k/48kHz)
PLL Unlock Flag (UNLOCK pin)
Yes
No
5V tolerant
No
Yes (TVDD)
Package 30VSOP
24VSOP
ASAHI KASEI
[AK4124]
MS0288-E-01
2004/08
- 4 -
PIN/FUNCTION
No. Pin
Name
I/O
Function
1
FILT
O
PLL Loop Filter Pin
2
AVSS
-
Analog Ground Pin
3 PDN
I
Power-Down Mode Pin
"H": Power up, "L": Power down reset and initializes the control register.
4 SMUTE
I
Soft Mute Pin
"H" : Soft Mute, "L" : Normal Operation
5 DITHER
I
Dither Enable Pin
"H" : Dither ON, "L" : Dither OFF
6
PLL2
I
PLL Mode Select 2 Pin
7
ILRCK
I/O Input Channel Clock Pin
8
IBICK
I/O Audio Serial Data Clock Pin
9
SDTI
I
Audio Serial Data Input Pin
10 IDIF0
I
Audio Interface Format 0 Pin for Input PORT
11 IDIF1
I
Audio Interface Format 1 Pin for Input PORT
12 IDIF2
I
Audio Interface Format 2 Pin for Input PORT
13 PLL0
I
PLL Mode Select 0 Pin
14 PLL1
I
PLL Mode Select 1 Pin
15 UNLOCK
O Unlock
Status
Pin
16 OBIT0
I
Bit Length Select 0 Pin for Output Data
17 OBIT1
I
Bit Length Select 1 Pin for Output Data
18 IMCLK
I
Master Clock Input Pin for Input PORT
19 CMODE0
I
Clock Mode Select 0 Pin
20 CMODE1
I
Clock Mode Select 1 Pin
21 CMODE2
I
Clock Mode Select 2 Pin
22 ODIF0
I
Audio Interface Format 0 Pin for Output PORT
23 ODIF1
I
Audio Interface Format 1 Pin for Output PORT
24 SDTO
O
Audio Serial Data Output Pin for Output PORT
25 OBICK
I/O Audio Serial Data Clock Pin for Output PORT
26 OLRCK
I/O Output Channel Clock Pin for Output PORT
27 OMCLK
I
Master Clock Input Pin for Output PORT
28 DVDD
-
Digital Power Supply Pin, 3.0
3.6V
29 DVSS
-
Digital Ground Pin
30 AVDD
-
Analog Power Supply Pin, 3.0
3.6V
Note: All input pins should not be left floating.
ASAHI KASEI
[AK4124]
MS0288-E-01
2004/08
- 5 -
Handling of Unused pins
The unused digital I/O pins should be processed appropriately as below.
Classification Pin
Name
Setting
Analog
FILT
This pin should be open.
Digital
SMUTE, DITHER
These pins should be connected to DVSS.
IMCLK, OMCLK
These pins should be connected to DVSS in slave mode.
UNLOCK
This pin should be open.
ABSOLUTE MAXIMUM RATINGS
(AVSS, DVSS=0V; Note 1)
Parameter Symbol
min
max
Units
Power Supplies:
Analog
Digital
|AVSS
- DVSS| (Note 2)
AVDD
DVDD
GND
-0.3
-0.3
-
4.6
4.6
0.3
V
V
V
Input Current, Any Pin Except Supplies
IIN
-
10 mA
Digital Input Voltage
VIND
-0.3 DVDD+0.3
V
Ambient Temperature (Power applied)
Ta
-40 85
C
Storage Temperature
Tstg
-65 150
C
Note 1. All voltages with respect to ground.
Note 2. AVSS, BVSS and DVSS must be connected to the same ground.
WARNING: Operation at or beyond these limits may result in permanent damage to the device.
Normal operation is not guaranteed at these extremes.
RECOMMENDED OPERATING CONDITIONS
(AVSS, DVSS=0V; Note 1)
Parameter Symbol
min
typ
max
Units
Power Supplies
(Note 3)
Analog
Digital
AVDD
DVDD
3.0
3.0
3.3
3.3
3.6
AVDD
V
V
Note 1. All voltages with respect to ground.
Note 3. The power up sequence between AVDD and DVDD is not critical.
WARNING: AKM assumes no responsibility for the usage beyond the conditions in this datasheet.
PDF 
ZIP