[AK4120]
AK4120
Sample Rate Converter with Mixer and Volume
GENERAL DESCRIPTION
The AK4120 is a stereo asynchronous sample rate converter. The input sample rate range is from 8kHz
to 48kHz. The output sample rate is fixed at 32kHz, 44.1kHz, 48kHz or 96kHz. AK4120 includes a
digital mixer and digital volume control. Applications for this device include pro audio mastering,
consumer format conversion and desktop audio production and playback.
FEATURES
Stereo Asynchronous Sample Rate Converter
Digital Mixer
Digital Volume
Input Sample Rate Range (FSI): 8kHz to 48kHz
Output Sample Rate (FSO): 32kHz, 44.1kHz, 48kHz and 96kHz
Input to Output Sample Rate Ratio: FSO/FSI = 0.667 to 6
THD+N: –113dB at 1kHz input
I/F format: MSB justified (20bit), LSB justified (16bit/20bit), I
2
S
Master clock: 256/512fs
3-wire Serial or I
2
C Bus µP I/F for mode setting
Power Supply: 2.7 to 3.6V
I2C
I2S
PDN
SDTI1
ILRCK1
IBICK1
IMCLK1
IMCLK2
SDTI2
ILRCK2
IBICK2
VDD
Input#1
Audio
I/F
Sample
Rate
Converter
Volume#1
VSS
TEST
OMCLK
SDTO
OLRCK
OBICK
Input#2
Audio
I/F
Volume#2
Output
Audio
I/F
μ
P I/F
I2MODE
CAD0
CSN/CAD1 CCLK/SDL CDTI/SDA
OMODE
MS0134-E-01
-1-
2008/06
[AK4120]
■
Ordering Guide
AK4120VF
AKD4120
-40
∼
+85°C
24pin VSOP (0.65mm pitch)
Evaluation Board for AK4120
■
Pin Layout
IMCLK1
SDTI1
IBICK1
ILRCK1
TEST
I2S
I2C
CAD0
CSN/CAD1
CCLK/SCL
CDTI/SDA
PDN
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
IMCLK2
SDTI2
IBICK2
ILRCK2
I2MODE
VDD
VSS
OMODE
OMCLK
SDTO
OBICK
OLRCK
Top
View
19
18
17
16
15
14
13
MS0134-E-01
-2-
2008/06
[AK4120]
PIN/FUNCTION
No.
1
2
3
4
5
6
7
8
9
10
Pin Name
IMCLK1
SDTI1
IBICK1
ILRCK1
TEST
I2S
I2C
CAD0
CSN
CAD1
CCLK
SCL
11
12
13
14
15
16
17
18
19
20
21
22
23
24
CDTI
SDA
PDN
OLRCK
OBICK
SDTO
OMCLK
OMODE
VSS
VDD
I2MODE
ILRCK2
IBICK2
SDTI2
IMCLK2
I/O
I
I
I
I
I
I
I
I
I
I
I
I
I
I/O
I
I/O
I/O
O
I
I
I
I
I
I/O
I/O
I
I
Function
Master Clock Input Pin for Input#1
Audio Serial Data Input Pin for Input#1
Audio Serial Data Clock Pin for Input#1
L/R Clock Pin for Input#1
Test Pin. Connect to VSS.
Audio I/F Select Pin
“L”: Set by Register, “H”: I
2
S
I
2
C Select Pin. “L”: 3-wire, “H”: I
2
C
Chip Address 0 Pin
Chip Select Pin in 3wire serial control mode in 3-wire Serial Control Mode.
Chip Address 1 Pin in I
2
C control mode.
Control Data Clock Pin in 3wire serial control mode in 3-wire Serial Control
Mode.
Control Data Clock Pin in I
2
C control mode.
Control Data Input Pin in 3wire serial control mode in 3-wire Serial Control
Mode.
Control Data Pin in I
2
C serial control mode in I
2
C control mode.
Power-Down pin
When “L”, the AK4120 is powered-down and reset.
L/R Clock Pin for Output
Audio Serial Data Clock Pin for Output
Audio Serial Data Pin for Output
Master Clock Pin for Output
Master/Slave select pin for Output Audio Data
“L”: Slave,
“H”: Master
Digital Ground Pin
Digital Power Supply Pin, 3.3V
Master/Slave select pin for Input Audio Data #2
“L”: Slave,
“H”: Master
L/R Clock Pin for Input#2
Audio Serial Data Clock Pin for Input#2
Audio Serial Data Input Pin for Input#2
Master Clock Input Pin for Input#2
MS0134-E-01
-3-
2008/06
[AK4120]
ABSOLUTE MAXIMUM RATINGS
(VSS=0V; Note 1)
Parameter
Power Supplies
Input Current, Any Pin Except Supplies
Input Voltage
Ambient Temperature (Power applied)
Storage Temperature
Symbol
VDD
IIN
VIN
Ta
Tstg
min
-0.3
-
-0.3
-40
-65
max
4.6
±10
VDD+0.3
85
150
Units
V
mA
V
°C
°C
Note 1: All voltages with respect to 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
(VSS=0V; Note 2)
Parameter
Power Supplies
Note 2: All voltages with respect to ground.
Symbol
VDD
min
2.7
typ
3.3
max
3.6
Units
V
WARNING: AKEMD assumes no responsibility for the usage beyond the conditions in this datasheet.
SRC PERFORMANCE
(Ta=-40∼ 85°C; VDD = 2.7∼3.6V; data = 20bit; measurement bandwidth = 20Hz~ FSO/2; unless otherwise specified.)
Parameter
Symbol
min
typ
max
Units
Resolution
20
Bits
Input Sample Rate (Note 3)
FSI
8
48
kHz
Output Sample Rate (Note 4)
FSO
32
96
kHz
Dynamic Range (Input= 1kHz, -60dBFS, Note 5)
dB
-
115
-
FSO/FSI=44.1kHz/48kHz
dB
-
116
-
FSO/FSI=48kHz/44.1kHz
dB
-
114
-
FSO/FSI=32kHz/48kHz
dB
-
119
-
FSO/FSI=96kHz/32kHz
dB
-
-
112
Worst Case (FSO/FSI=32kHz/48kHz)
Dynamic Range (Input= 1kHz, -60dBFS, A-weighted, Note 5)
dB
-
117
-
FSO/FSI=44.1kHz/48kHz
THD+N
(Input= 1kHz, 0dBFS, Note 5)
FSO/FSI=44.1kHz/48kHz
-
-112
-
dB
FSO/FSI=48kHz/44.1kHz
-
-113
-
dB
FSO/FSI=32kHz/48kHz
-
-111
-
dB
FSO/FSI=96kHz/32kHz
-
-111
-
dB
Worst Case (FSO/FSI=48kHz/8kHz)
-
-
-103
dB
Ratio between Input and Output Sample Rate
FSO/FSI
(FSO/FSI, Note 6, Note 7)
0.667
6
-
Note 3. 32kHz~96kHz for INPUT#2 at Path Mode 0. 8kHz~96kHz at Path Mode 2 and 3.
Note 4. Min = 8kHz at Path Mode 2 and 3.
Note 5. Measured by Rohde & Schwarz UPD04, Rejection Filter= wide, 8192point FFT. Refer Figure 1 and Figure 2.
Note 6. The “0.667” is the ratio of FSO/FSI when FSI is 48kHz and FSO is 32kHz
Note 7. The “6” is the ratio when FSI is 8kHz and FSO is 48kHz.
MS0134-E-01
-4-
2008/06
[AK4120]
-101
THD+N [dB]
-103
-105
-107
-109
-111
-113
-115
32
37
FSI [kHz]
42
47
Figure 1: Input Sample Rate (FSI) vs. THD+N (FSO=48kHz)
-80
-85
-90
THD+N [dB]
-95
-100
-105
-110
-115
-120
10
100
1000
Input Frequency [Hz]
10000
100000
Figure 2: Input Frequency vs. THD+N (FSI=44.1kHz, FSO=48kHz)
MS0134-E-01
-5-
2008/06
Microchip MCU
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