AK4648 Datasheet, PDF (103/119 Pages) Asahi Kasei Microsystems – Stereo CODEC with MIC/HP/SPK-AMP

[AK4648]
CONTROL SEQUENCE
■ Clock Set up
When ADC or DAC is powered-up, the clocks must be supplied.
1. PLL Master Mode.
Power Supply
PDN pin
PMVCM bit
(Addr:00H, D6)
MCKO bit
(Addr:01H, D1)
PMPLL bit
(Addr:01H, D0)
MCKI pin
M/S bit
(Addr:01H, D3)
BICK pin
LRCK pin
MCKO pin
(1)
(2) (3)
(4)
Example:
Audio I/F Format: MSB justified (ADC & DAC)
BICK frequency at Master Mode: 64fs
Input Master Clock Select at PLL Mode: 11.2896MHz
MCKO: Enable
Sampling Frequency: 44.1kHz
(1) Power Supply & PDN pin = “L” Æ “H”
(5)
Input
40msec(max)
40msec(max)
(7)
(6)
Output
(8)
Output
(2)Addr:01H, Data:08H
Addr:04H, Data:4AH
Addr:05H, Data:27H
(3)Addr:00H, Data:40H
(4)Addr:01H, Data:0BH
MCKO, BICK and LRCK output
Figure 71. Clock Set Up Sequence (1)
<Example>
(1) After Power Up, PDN pin = “L” Æ “H”. “L” time of 150ns or more is needed to reset the AK4648.
The AK4648 should be operated as the recommended power-up/down sequence shown in “System Design
(Grounding and Power Supply Decoupling)” to avoid the pop noise at the speaker output, lineout output, and
headphone output.
(2) DIF1-0, PLL3-0, FS3-0, BCKO and M/S bits should be set during this period.
(3) Power UpVCOM: PMVCM bit = “0” Æ “1”
VCOM should first be powered-up before the other block operates.
(4) In case of using MCKO output: MCKO bit = “1”
In case of not using MCKO output: MCKO bit = “0”
(5) PLL lock time is 40ms(max.) after PMPLL bit changes from “0” to “1” and MCKI is supplied from an external
source.
(6) The AK4648 starts to output the LRCK and BICK clocks after the PLL becomes stable. Then normal operation
starts.
(7) The invalid frequency is output from MCKO pin during this period if MCKO bit = “1”.
(8) The normal clock is output from MCKO pin after the PLL is locked if MCKO bit = “1”.
MS0625-E-01
- 103 -
2007/06