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ASAHI KASEI
[AK4641]
AK4641
16-Bit ∆Σ CODEC with Bluetooth Interface
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)
1st MIC Amplifier: +20dB or 0dB
2nd 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: I2S, 16bit MSB justified
2. Playback Function of 16bit Stereo CODEC
Digital De-emphasis Filter (tc=50/15µs, 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: I2S, 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, I2S, 16bit MSB justified
4. Power Management
5. Master Clock: 1.792MHz 12.288MHz
6. Control mode: I2C Bus
7. Ta = 20 85°C
8. Power Supply: 2.6V3.6V (typ. 3.3V)
9. Power Supply Current: 17mA
10. Package: 36pin QFN (0.5mm pitch)
MS0301-E-02
-1-
2005/05

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ASAHI KASEI
„ Block Diagram
[AK4641]
MPE
MPI
INT
EXT
MDT
MOUT+
MOUT-
LOUT
ROUT
MOUT2
MICOUT
MIC Power
Supply
MIC Power
Supply
PMMIC
AIN
MIC-AMP
0dB or 20dB
ALC1
(IPGA)
0.075 x AVDD
PMMO
ATT
PMLO
ATT ATT
PMMO2
PMMIX
AUXIN+
AUXIN-
VCOM
PMAUX
Volume
AVSS AVDD
DVSS DVDD
PMADC
ADC HPF
Stereo
CODEC
Audio
Interface
PMDAC
5Band DATT
DAC EQ SMUTE
Control
Register
TST2
TST1
MCLK
PDN
LRCK
BICK
SDTO
SDTI
SCL
SDA
PMAD2
ADC HPF
PMDA2
DAC
Mono
CODEC
Audio
I/F
PLL
BBICK
BSYNC
BSDTO
BSDTI
VCOC
DSP
and
uP
Bluetooth
Module
Figure 1. Block Diagram
BVDD BVSS
MS0301-E-02
-2-
2005/05

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ASAHI KASEI
„ Ordering Guide
AK4641VN
AKD4641
20 +85°C
36pin QFN (0.5mm pitch)
Evaluation board for AK4641
„ Pin Layout (36pin QFN)
[AK4641]
MPE
MPI
INT
VCOM
AVSS
AVDD
BVDD
BVSS
VCOC
1
2
3
4
5
6
7
8
9
Top View
27 ROUT
26 MOUT2
25 TST2
24 BBICK
23 BSYNC
22 BSDTO
21 BSDTI
20 DVSS
19 DVDD
MS0301-E-02
-3-
2005/05

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ASAHI KASEI
[AK4641]
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
Analog Input INT, AUXIN+, AUXIN, AIN, MDT, EXT
Analog Output
MPE, MPI, MOUT2, ROUT, LOUT, MOUT, MOUT+,
MICOUT
Digital Input BSDTI, BSYNC, BBICK
Digital Output BSDTO
Setting
These pins should be open.
These pins should be open.
These pins should be connected to DVSS.
These pins should be open.
MS0301-E-02
-4-
2005/05

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ASAHI KASEI
[AK4641]
ABSOLUTE MAXIMUM RATINGS
(AVSS, DVSS, BVSS =0V; Note 1)
Parameter
Symbol
min
Power Supplies: Analog
AVDD
0.3
Digital
DVDD
0.3
16bit Mono CODEC
BVDD
0.3
|AVSS – DVSS| (Note 2)
GND1
-
|AVSS – BVSS| (Note 2)
GND2
-
Input Current, Any Pin Except Supplies
IIN -
Analog Input Voltage
VINA
0.3
Digital Input Voltage
VIND
0.3
Ambient Temperature (powered applied)
Ta 20
Storage Temperature
Tstg 65
Note 1. All voltages with respect to ground.
Note 2. AVSS, DVSS and BVSS must be connected to the same analog ground plane.
max
4.6
4.6
4.6
0.3
0.3
±10
AVDD+0.3
DVDD+0.3
85
150
WARNING: Operation at or beyond these limits may result in permanent damage to the device.
Normal operation is not guaranteed at these extremes.
Units
V
V
V
V
V
mA
V
V
°C
°C
RECOMMENDED OPERATING CONDITIONS
(AVSS, DVSS, BVSS=0V; Note 1)
Parameter
Symbol
min typ
Power Supplies Analog
AVDD
2.6 3.3
(Note 3) Digital
DVDD
2.6 3.3
16bit Mono CODEC
BVDD
2.6 3.3
Differences
AVDDBVDD
0.1
0
AVDDDVDD
0.3
0
BVDDDVDD
0.3
0
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.
max Units
3.6 V
3.6 V
3.6 V
+0.1 V
+0.3 V
+0.3 V
MS0301-E-02
-5-
2005/05