AK4636 Datasheet, PDF (42/105 Pages) Asahi Kasei Microsystems – 16-Bit Mono CODEC with ALC & MIC/SPK/Video-AMP

[AK4636]
2. Interface
The digital microphone outputs data when DMCLK is “H” by setting DCLKP bit = “1”, and it outputs data when
DMCLK is “L” by setting DCLKP bit = “0”. The DMCLK data only supports 64fs. The DMCLK pin outputs is 64fs when
DCLKE bit = “1”. In this case, necessary clocks must be supplied to the AK4636 for ADC operation. The DMCLK
outputs “L” when DCLKE bit = “0”. Figure 41 and Figure 42 show data input/output timings. When DCLKP bit = “1”,
the digital microphone outputs data on the rising edge “↑” of DMCLK and the AK4636 latches data on the falling edge
“↓” of DMCLK. When DCLKP bit = “0”, the digital microphone outputs data on the rising edge “↓” of DMCLK and the
AK4636 latches data on the falling edge “↑” of DMCLK.
The PDM signal is defined as 0dB (full scale) when the 1 bit data density ranges ±50% from 50%.
DMCLK(64fs)
DMDAT
Valid
DCLKP bit = “1”
Data
Valid
Data
Valid
Data
Valid
Data
Figure 41. Data In/Output Timing with Digital MIC (DCLKP bit = “1”)
DMCLK(64fs)
DMDAT
Valid
DCLKP bit = “0”
Data
Valid
Data
Valid
Data
Valid
Data
Figure 42. Data In/Output Timing with Digital MIC (DCLKP bit = “0”)
MS1012-E-01
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2010/08