AK4637 Datasheet, PDF (82/96 Pages) Asahi Kasei Microsystems – 24bit Mono CODEC with MIC - SPK-AMP

[AK4637]
10. Recommended External Circuits
Figure 65 shows the system connection diagram. An evaluation board (AKD4637) is available for fast
evaluation as well as suggestions for peripheral circuitry.
Speaker
Analog Ground Digital Ground
Power Supply
1.6  1.98V
10u
Power Supply
0.1u
2.8  5.5V
10u
0.1u
2.2u
or 4.7u
2.2u
16 VSS1
17 VCOM
18 REGFIL
19 MPWR
Beep In
C
20
BEEP/IN-
/DMCLK
AK4637
Top View
0.1u 10u
TVDD 10
MCKI 9
BICK 8
FCK 7
SDTO 6
Power Supply
1.6  3.6V
DSP
C
Internal MIC
P
Notes:
- VSS1 and VSS2 of the AK4637 must be distributed separately from the ground of external
controllers.
- All digital input pins must not be allowed to float.
- When the AK4637 is used in master mode, FCK pin is floating before M/S bit is changed to “1”.
Therefore, a pull-up or pull-down resistor around 100k must be connected to FCK pin of the
AK4637.
- 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. Other capacitors do not have specific types.
Figure 65. System Connection Diagram
015010680-E-00
- 82 -
2015/09