|
AK4648 Datasheet, PDF (31/119 Pages) Asahi Kasei Microsystems – Stereo CODEC with MIC/HP/SPK-AMP | |||
|
◁ |
[AK4648]
OPERATION OVERVIEW
â System Clock
There are the following five clock modes to interface with external devices. (Table 2 and Table 3.)
Mode
PMPLL bit
M/S bit
PLL3-0 bits
Figure
PLL Master Mode (Note 54)
1
1
Table 5
Figure 18
PLL Slave Mode 1
(PLL Reference Clock: MCKI pin)
1
0
Table 5
Figure 19
PLL Slave Mode 2
(PLL Reference Clock: LRCK or BICK pin)
1
0
Table 5
Figure 20
Figure 21
EXT Slave Mode
0
0
x
Figure 22
EXT Master Mode
0
1
x
Figure 23
Note 54. If M/S bit = â1â, PMPLL bit = â0â and MCKO bit = â1â during the setting of PLL Master Mode, the invalid
clocks are output from MCKO pin when MCKO bit is â1â.
Table 2. Clock Mode Setting (x: Donât care)
Mode
PLL Master Mode
PLL Slave Mode
(PLL Reference Clock: MCKI pin)
MCKO bit
0
1
0
1
MCKO pin
âLâ
Selected by
PS1-0 bits
âLâ
Selected by
PS1-0 bits
MCKI pin
Selected by
PLL3-0 bits
Selected by
PLL3-0 bits
PLL Slave Mode
(PLL Reference Clock: LRCK or BICK pin)
0
âLâ
GND
EXT Slave Mode
0
âLâ
Selected by
FS1-0 bits
EXT Master Mode
0
âLâ
Selected by
FS1-0 bits
Table 3. Clock pins state in Clock Mode
BICK pin
Output
(Selected by
BCKO bit)
Input
(⥠32fs)
Input
(Selected by
PLL3-0 bits)
Input
(⥠32fs)
Output
(Selected by
BCKO bit)
LRCK pin
Output
(1fs)
Input
(1fs)
Input
(1fs)
Input
(1fs)
Output
(1fs)
â Master Mode/Slave Mode
The M/S bit selects either master or slave mode. M/S bit = â1â selects master mode and â0â selects slave mode. When the
AK4648 is power-down mode (PDN pin = âLâ) and exits reset state, the AK4648 is slave mode. After exiting reset state,
the AK4648 goes to master mode by changing M/S bit = â1â.
When the AK4648 is used by master mode, LRCK and BICK pins are a floating state until M/S bit becomes â1â. LRCK
and BICK pins of the AK4648 should be pulled-down or pulled-up by the resistor (about 100kΩ) externally to avoid the
floating state.
M/S bit
Mode
0
Slave Mode
1
Master Mode
Table 4. Select Master/Slave Mode
(default)
MS0625-E-01
- 31 -
2007/06
|
▷ |