AK4951AEN Datasheet, PDF (88/105 Pages) Asahi Kasei Microsystems – 24bit Stereo CODEC with MIC/HP/SPK-AMP

[AK4951A]
10. Recommended External Circuits
Figure 58 shows the system connection diagram. An evaluation board (AKD4951AEN) is available for
fast evaluation as well as suggestions for peripheral circuitry.
Headphone
Analog Ground Digital Ground
33 0.22u
Speaker
33 0.22u
Power Supply
1.8  5.5V
10u
Power Supply
1.6  1.98V
10u
0.1u
2.2u
0.1u
Power Supply 10u
2.8  3.5V
Beep In
25 ^VSS2
2.2u
26 ^CP
27 ^CN
0.1u
28 ^AVDD
29 ^VSS1
2.2u
C
2.2u
30 ^VCOM
31 ^REGFIL
32 ^RIN3/BEEP
AK4951AEN
Top View
TVDD ₁₆
MCKI ₁₅
BICK ₁₄
LRCK ₁₃
SDTO ₁₂
SDTI ₁₁
SDA ₁₀
SCL 9
0.1u 10u
Power Supply
1.6  3.5V
DSP
P
C
External MIC
C
C
Internal MIC
C
Notes:
- VSS1, VSS2 and VSS3 of the AK4951A must be distributed separately from the ground of
external controllers.
- All digital input pins must not be allowed to float.
- When the AK4951A is used in master mode, LRCK and BICK pins are floating before M/S bit is
changed to “1”. Therefore, a pull-up or pull-down resistor around 100k must be connected to
LRCK and BICK pins of the AK4951A.
- The pull-up resistors of the SCL and SDA pins must be connected to a voltage in the range from
TVDD or more to 6V or less.
- 0.1μF capacitors at power supply pins and 2.2μF capacitors between CP and CN pins, and
between VEE and VSS2 pins should be ceramic capacitors. Other capacitors do not have
specific types.
Figure 58. System Connection Diagram
016001936-E-00
- 88 -
2016/03