AK4671_10 Datasheet, PDF (43/166 Pages) Asahi Kasei Microsystems – Stereo CODEC with MIC/RCV/HP-AMP

[AK4671]
OPERATION OVERVIEW
■ System Clock (Audio I/F)
There are the following five clock modes to interface with external devices. (Table 1 and Table 2)
Mode
PMPLL bit
M/S bit
PLL3-0 bits
Figure
PLL Master Mode (Note 60)
1
1
See Table 4
Figure 39
PLL Slave Mode 1
(PLL Reference Clock: MCKI pin)
1
0
See Table 4
Figure 40
PLL Slave Mode 2
(PLL Reference Clock: LRCK or BICK pin)
1
0
See Table 4
Figure 41
Figure 42
EXT Slave Mode
0
0
x
Figure 43
EXT Master Mode
0
1
x
Figure 44
Note 60. If M/S bit = “1”, PMPLL bit = “0” and MCKO bit = “1” during the setting of PLL Master Mode, the invalid
clocks are output from MCKO pin when MCKO bit is “1”.
Table 1. Clock Mode Setting (x: Don’t care)
Mode
PLL Master Mode
PLL Slave Mode
(PLL Reference Clock: MCKI pin)
MCKO bit
0
1
0
1
MCKO pin
L
Selected by
PS1-0 bits
L
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
L
GND
EXT Slave Mode
0
L
Selected by
FS1-0 bits
EXT Master Mode
0
L
Selected by
FS1-0 bits
Table 2. 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)
■ Master Mode/Slave Mode
The M/S bit selects either master or slave mode. M/S bit = “1” selects master mode and “0” selects slave mode. When the
AK4671 is power-down mode (PDN pin = “L”) and exits reset state, the AK4671 is slave mode. After exiting reset state,
the AK4671 goes to master mode by changing M/S bit = “1”.
When the AK4671 is used by master mode, LRCK and BICK pins are a Hi-Z state until M/S bit becomes “1”. LRCK and
BICK pins of the AK4671 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 3. Select Master/Slave Mode
(default)
MS0666-E-02
- 43 -
2010/06