AK4950 Datasheet, PDF (94/106 Pages) Asahi Kasei Microsystems – 24bit Stereo CODEC with MIC/SPK/Cap-less VIDEO-AMP & mini DSP

3. When the external clock (MCKI pin) is used in PLL Slave mode.
[AK4950]
Power Supply
PDN pin
MCKO bit
(Addr:01H, D17)
PLL3-0 bits
(Addr:07H, D20-23)
FS3-0 bits
(Addr:08H, D19-16)
PMPLL bit
(Addr:01H, D16)
MCKI pin
MCKO pin
(1)
1msec(min)
(3)
(2)
(4)
Default
(5)
Default
(6)
"1100"
"1011"
Input
10msec(max)
(8)
BICK pin
LRCK pin
INIT bit
(Addr:0EH, D16)
10msec(max)
Example:
Audio I/F Format: MSB justified (ADC & DAC)
BICK frequency at Slave mode : 64fs
Input Master Clock Select at PLL Mode: 13.5MHz
MCKO: Enable
Sampling Frequency: 48kH z
(1) Power Supply & PDN pin = “L” Æ “H”
(2) Wait time (min)1ms
(7)
Output
(9)
Input
(10)
(3) Addr:01H, Data:02H
(4) Addr:07H, Data:C2H
(5) Addr:08H, Data:0BH
(6) Addr:01H, Data:03H
MCKO output start
BICK and LRCK input start
Figure 68. Clock Set Up Sequence (3)
<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) In case of using MCKO output: MCKO bit = “1”
In case of not using MCKO output: MCKO bit = “0”
(4) PLL mode setting. (When the reference clock is MCKI = 13.5MHz, PLL3-0 bits = “1100”)
(5) Sampling frequency setting. (In case of fs = 48kHz, FS3-0 bits = “1011”)
(6) PLL lock time is 10ms (max) after the PMPLL bit changes from “0” to “1” and PLL reference clock (MCKI pin)
is supplied.
(7) Normal clock is output from the MCKO pin after PLL is locked.
(8) Invalid clock is output from MCKO pin during this period.
(9) BICK and LRCK clocks should be synchronized with MCKO clock.
(10) Digital Function Initializing
Digital functions can be initialized by setting INIT bit = “0” → “1” after normal clock is output. 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
- 94 -
2011/10