ASAHI KASEI
[AK4641]
MS0301-E-00
2004/05
-
1
-
GENERAL DESCRIPTION
The AK4641 is targeted at PDA and other low-power, small size applications. It features a 16bit Stereo
CODEC with a built-in Microphone-Amplifier and 16bit Mono CODEC for Bluetooth Interface. Input
circuits include Microphone-Amplifier and ALC (Auto Level Control) circuit. The AK4641 is available in a
36pin QFN, utilizing less board space than competitive offerings.
FEATURES
1. Recording Function of 16bit Stereo CODEC
Mono Input
2 to 1 Selector (Internal and External MIC)
1
st
MIC Amplifier: +20dB or 0dB
2
nd
Amplifier with ALC: +27.5dB
-
8dB, 0.5dB Step
ADC Performance: S/(N+D): 81dB, S/N: 86dB
Sampling Rate: 7kHz
48kHz
Audio Interface Format: I
2
S, 16bit MSB justified
2. Playback Function of 16bit Stereo CODEC
Digital De-emphasis Filter (tc=50/15
s, fs=32kHz, 44.1kHz, 48kHz)
Digital Volume (0dB
-
127dB, 0.5dB Step, Mute)
5 Band Equalizer
Stereo Line Output
- Performance: S/(N+D): 86dB, S/N: 90dB
Mono Line Output
- Differential Output
- Performance: S/(N+D): 86dB, S/N: 93dB
AUX Input
- Differential Input
- +24dB
-
21dB, 3dB step
Sampling Rate: 7kHz
48kHz
Audio Interface Format: I
2
S, 16bit MSB justified, 16bit LSB justified
3. 16bit Mono CODEC
Analog Mix Path for Bluetooth Interface
Sample Rate: 8kHz
16kHz
Audio Interface Format: Short/Long Frame, I
2
S, 16bit MSB justified
4. Power Management
5. Master Clock: 1.792MHz
12.288MHz
6. Control mode: I
2
C Bus
7. Ta =
-
10
70
C
8. Power Supply: 2.6V
3.6V (typ. 3.3V)
9. Power Supply Current: 17mA
10. Package: 36pin QFN (0.5mm pitch)
AK4641
16-Bit
CODEC with Bluetooth Interface
ASAHI KASEI
[AK4641]
MS0301-E-00
2004/05
-
4
-
PIN/FUNCTION
No. Pin
Name
I/O
Function
1
MPE
O
MIC Power Supply Pin for External Microphone
2
MPI
O
MIC Power Supply Pin for Internal Microphone
3
INT
I
Internal Microphone Input Pin (Mono Input)
4 VCOM
O
Common Voltage Output Pin, 0.45*AVDD
Bias voltage of ADC inputs and DAC outputs.
5
AVSS
-
Analog Ground Pin
6
AVDD
-
Analog Power Supply Pin
7
BVDD
-
Power Supply Pin for 16bit Mono CODEC of Bluetooth I/F
8
BVSS
-
Ground Pin for 16bit Mono CODEC of Bluetooth I/F
9
VCOC
O
PLL Loop Filter Pin for 16bit Mono CODEC of Bluetooth I/F
10 PDN
I
Power-Down Mode Pin
"H": Power up, "L": Power down reset and initializes the control register.
11 TST1
I
Test Pin. Connect to DVSS.
12 SCL
I
Control Data Clock Pin
13 SDA
I/O Control Data Input Pin
14 SDTI
I
Audio Serial Data Input Pin
15 SDTO
O
Audio Serial Data Output Pin
16 LRCK
I
Input/Output Channel Clock Pin
17 BICK
I
Audio Serial Data Clock Pin
18 MCLK
I
External Master Clock Input Pin
19 DVDD
-
Digital Power Supply Pin
20 DVSS
-
Digital Ground Pin
21 BSDTI
I
Serial Data Input Pin for 16bit Mono CODEC of Bluetooth I/F
22 BSDTO
O
Serial Data Output Pin for 16bit Mono CODEC of Bluetooth I/F
23 BSYNC
I
Sync Signal Pin for 16bit Mono CODEC of Bluetooth I/F
24 BBICK
I
Serial Data Clock Pin for 16bit Mono CODEC of Bluetooth I/F
25 TST2
I
Test Pin. Connect to AVSS.
26 MOUT2
O
Mono Line Output 2 Pin
27 ROUT
O
Rch Stereo Line Output Pin
28 LOUT
O
Lch Stereo Line Output Pin
29 MOUT
-
O
Mono Line Negative Output Pin
30 MOUT+
O
Mono Line Positive Output Pin
31 AUX IN
-
I
Mono AUX Negative Input Pin
32 AUX IN+
I
Mono AUX Positive Input Pin
33 AIN
I Analog
Input
Pin
34 MICOUT
O
Microphone Analog Output Pin
35 MDT
I Microphone Detect Pin (Internal pull down by 500k
)
36 EXT
I
External Microphone Input Pin (Mono Input)
Note: All input pins except analog input pins (INT, EXT, AIN, AUXIN+, AUXIN
-, MDT) should not be left floating.
Handling of Unused Pin
The unused I/O pins should be processed appropriately as below.
Classification Pin
Name
Setting
Analog Input
INT, AUXIN+, AUXIN
-, AIN, MDT, EXT
These pins should be open.
Analog Output
MPE, MPI, MOUT2, ROUT, LOUT, MOUT
-, MOUT+,
MICOUT
These pins should be open.
Digital Input
BSDTI, BSYNC, BBICK
These pins should be connected to DVSS.
Digital Output
BSDTO
These pins should be open.
ASAHI KASEI
[AK4641]
MS0301-E-00
2004/05
-
5
-
ABSOLUTE MAXIMUM RATINGS
(AVSS, DVSS, BVSS =0V; Note 1)
Parameter Symbol
min
max
Units
Power Supplies:
Analog
AVDD
-0.3
4.6 V
Digital
DVDD
-0.3
4.6 V
16bit Mono CODEC
BVDD
-0.3
4.6 V
|AVSS DVSS|
(Note 2)
GND1
- 0.3
V
|AVSS BVSS|
(Note 2)
GND2
- 0.3
V
Input Current, Any Pin Except Supplies
IIN
-
10
mA
Analog Input Voltage
VINA
-0.3
AVDD+0.3 V
Digital Input Voltage
VIND
-0.3
DVDD+0.3 V
Ambient Temperature (powered applied)
Ta
-10
70
C
Storage Temperature
Tstg
-65
150
C
Note 1. All voltages with respect to ground.
Note 2. AVSS, DVSS and BVSS must be connected to the same analog ground plane.
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, BVSS=0V; Note 1)
Parameter Symbol
min
typ
max
Units
Power
Supplies
Analog
AVDD 2.6 3.3 3.6 V
(Note
3)
Digital
DVDD 2.6 3.3 3.6 V
16bit Mono CODEC
BVDD
2.6
3.3
3.6
V
Differences
AVDD
-BVDD
-0.1
0 +0.1 V
AVDD
-DVDD
-0.3
0 +0.3 V
BVDD
-DVDD
-0.3
0 +0.3 V
Note 1. All voltages with respect to ground.
Note 3. The power up sequence between AVDD, DVDD and BVDD is not critical.
* AKM assumes no responsibility for the usage beyond the conditions in this datasheet.
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