AK4637EN Datasheet, PDF (42/96 Pages) Asahi Kasei Microsystems – 24bit Mono CODEC with MIC/SPK-AMP

[AK4637]
2. Interface
When DCLKP bit = “1”, data is input to the decimation filter while DMCLK = “H”. When DCLKP bit = “0”,
data is input to the decimation filter while DMCLK pin= “L”. The DMCLK pin only supports 64fs. When
DCLKE bit = “1”, DMCLK pin outputs 64fs. In this case, necessary clocks must be supplied to the AK4637
for ADC operation. When DCLKE bit = “0”, DMCLK pin outputs “L”. The Figure 37 and Figure 38 show the
input and output timing. When DCLKP bit = “1”, Digital MIC outputs the data by the rising edge (“”) of
DMCLK, and the AK4637 latches it by the falling edge (“”) of DMCLK. When DCLKP bit = “0”, Digital MIC
outputs the data by the rising edge (“”) of DMCLK, and the AK4637 latches it by the falling edge (“”) of
DMCLK. The output data through “the Decimation and Digital Filters” is 24bit full scale when the 1bit data
density is 0%~100%.
DMCLK(64fs)
DMDAT
Valid
Valid
Valid
Valid
DCLKP bit = “1”
Data
Data
Data
Data
Figure 37. Data In/Output Timing with Digital Microphone (DCLKP bit = “1”)
DMCLK(64fs)
DMDAT
Valid
Valid
Valid
Valid
DCLKP bit = “0”
Data
Data
Data
Data
Figure 38. Data In/Output Timing with Digital Microphone (DCLKP bit = “0”)
015010680-E-00
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2015/09