ak4368 AKM Semiconductor, Inc., ak4368 Datasheet - Page 20

• Manufacturer Part Number: ak4368
• Description: Dac With Built-in Pll & Hp-amp
• Manufacturer: AKM Semiconductor, Inc.

ASAHI KASEI
2) EXT mode (PMPLL bit = “0”: Default)
The AK4368 can be placed in external clock mode (EXT mode) by setting the PMPLL bit to “0”. In EXT mode, the
master clock can directly input to the DAC via the MCKI pin without going through the PLL. In this case, the sampling
frequency and MCKI frequency can be selected by FS3-0 bits (refer to Table 6). In EXT mode, PLL3-0 bits are ignored.
MCKO output is enabled by controlling the MCKO bit. MCKO output frequency can be controlled by PS1-0 bits. If the
sampling frequency is changed during normal operation of the DAC (PMDAC bit = “1”), the change should occur after
the input is muted by SMUTE bit = “1”, or the input is set to “0” data.
LRCK and BICK are output from the AK4368 in master mode(Figure 13). The clock input to the MCKI pin should
always be present whenever the DAC is in normal operation (PMDAC bit = “1”). If these clocks are not provided, the
AK4368 may draw excessive current and will not operate properly because it utilizes these clocks for internal dynamic
refresh of registers. If the external clocks are not present, the DAC should be placed in power-down mode (PMDAC bit =
“0”).
The external clocks required to operate the AK4368 in slave mode are MCKI, LRCK and BICK(Figure 14). The master
clock (MCKI) should be synchronized with the sampling clock (LRCK). The phase between these clocks does not matter.
All external clocks (MCKI, BICK and LRCK) should always be present whenever the DAC is in normal operation mode
(PMDAC bit = “1”). If these clocks are not provided, the AK4368 may draw excessive current and will not operate
properly, because it utilizes these clocks for internal dynamic refresh of registers. If the external clocks are not present, the
DAC should be placed in power-down mode (PMDAC bit = “0”).
MS0529-E-00
AK4368
AK4368
MCKO
MCKI
BICK
LRCK
SDATA
MCKO
MCKI
BICK
LRCK
SDATA
Figure 13. EXT Master Mode
Figure 14. EXT Slave Mode
256fs, 512fs or 1024fs
256fs, 512fs or 1024fs
32fs ~ 64fs
32fs, 64fs
1fs
1fs
- 20 -
MCLK
BCLK
LRCK
SDTO
MCLK
BCLK
LRCK
SDTO
DSP or µP
DSP or µP
[AK4368EG]
2006/07