AK4953A Datasheet, PDF (36/96 Pages) Asahi Kasei Microsystems – 24bit Stereo CODEC with MIC/HP/SPK-AMP

[AK4953A]
■ Digital MIC
1. Connection to Digital Microphones
The AK4953A can be connected to a digital microphone by setting DMIC bit = “1”, and it supports sampling frequency
up to 48kHz. When DMIC bit is set to “1”, the LIN1 and RIN1 pins become DMDAT (digital microphone data input) and
DMCLK (digital microphone clock supply) pins respectively. The same voltage as AVDD must be provided to the digital
microphone. The Figure 26 and Figure 27 show mono/stereo connection examples. The DMCLK signal is output from the
AK4953A, and the digital microphone outputs 1bit data, which generated by ΔΣModulator using, from DMDAT.
PMDML/R bits control power up/down of the digital block (Decimation Filter and Digital Filter). PMADL/PMADR bits
settings do not affect the digital microphone power management. The DCLKE bit controls ON/OFF of the output clock
from the DMCLK pin. When the AK4953A is powered down (PDN pin= “L”), the DMCLK and DMDAT pins are
floating state. Pull-down resistors must be connected to the DMCLK and DMDAT pins externally to avoid this floating
state.
AVDD
AK4953A
VDD
AMP
ΔΣ
Modulator
Lch
DMCLK(64fs)
100kΩ
PLL
DMDAT
R
Decimation _HPF1
Filter
P rogram mab le
Filter
ALC
MCKI
SDTO
VDD
AMP
ΔΣ
Modulat or
Rch
Figure 26. Connection Example of Stereo Digital MIC
AVD D
AK4953A
VDD
AMP
ΔΣ
Modulator
DMCLK(64fs)
100kΩ
DMDAT
R
PLL
Decimation _HPF1
Filter
P rogram mab le
Filter
ALC
MCKI
SDTO
Figure 27. Connection Example of Mono Digital MIC
MS1252-E-00
- 36 -
2010/10