AK4950 Datasheet, PDF (95/106 Pages) Asahi Kasei Microsystems – 24bit Stereo CODEC with MIC/SPK/Cap-less VIDEO-AMP & mini DSP

4. EXT Slave Mode
[AK4950]
Power Supply
PDN pin
FS3-0 bits
(Addr:08H, D19-16)
MCKI pin
LRCK pin
BICK pin
INIT bit
(Addr:0EH, D16)
(1)
(2)
(3)
(4)
Input
(4)
Input
(5)
Example:
Audio I/F Format: MSB justified (ADC and DAC)
Input MCKI frequency: 512fs
MCKO: Disable
(1) Power Supply & PDN pin = “L” Æ “H”
(2) Wait time (min)1ms
(3) Addr:08H, Data:03H
MCKI, BICK and LRCK input
Figure 69. Clock Set Up Sequence (4)
<Example>
(1) After Power Up: PDN pin “L” → “H”
“L” time (1) of 150ns or more is needed to reset the AK4950.
(2) PDN pin reset release waiting time
Wait time of 1ms or more is needed for the internal VCOM voltage rising.
(3) Sampling frequency setting. (In case of fs = 48kHz, FS3-0 bits = “xx11”)
(4) Normal operation starts after the MCKI, LRCK and BICK are supplied.
(5) Digital Function Initializing
Digital functions can be initialized by setting INIT bit = “0” → “1” after normal clock is supplied. The
initializing time is 1/512fs x 18,000 [s]. INIT bit returns to “0” automatically when the initialization is finished.
This initialization must be executed when using ALC and Programmable Filter.
MS1320-E-00
- 95 -
2011/10