ak4682 AKM Semiconductor, Inc., ak4682 Datasheet - Page 15

• Manufacturer Part Number: ak4682
• Description: Multi-channel Codec With 2vrms Stereo Selector
• Manufacturer: AKM Semiconductor, Inc.

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External clocks (MCLKA, BICKA, LRCKA) must always be present whenever the DAC is in normal operation mode
(PDN pin = “H” and PWDA = “1”). The master clock (MCLKA) must be synchronized with LRCKA but the phase is
not critical. If these clocks are not provided, the DAC may draw excess current because the device utilizes dynamic
refreshed logic internally. If the external clocks are not present, the DAC must be in the power-down mode (PDN pin =
“L” or PWDA = “0”) or in the reset mode (RSTN bit = “0”). After exiting reset at power-up etc., the DAC is in the
power-down mode until MCLKA and LRCKA are input.
There are two modes for controlling the sampling speed of DAC. One is the Manual Setting Mode (ACKS bit = “0”)
using the DFS1-0 bits, and the other is Auto Setting Mode (ACKS bit = “1”).
1. Manual Setting Mode (ACKS bit = “0”)
When the ACKS bit = “0”, DAC is in Manual Setting Mode and the sampling speed is selected by DFS1-0 bits (Table
4).
MS0610-E-01
DAC Clock Control
32.0kHz
44.1kHz
48.0kHz
LRCKB
fs
Table 5. DAC system clock example (DAC Normal Speed Mode @Manual Setting Mode)
Table 6. DAC system clock example(DAC Double Speed Mode @Manual Setting Mode)
LRCKA
88.2kHz
96.0kHz
LRCKA
32.0kHz
44.1kHz
48.0kHz
DFS1
Table 4.DAC sampling speed (ACKS bit = “0”, Manual Setting Mode)
fs
fs
0
0
1
1
128fs
-
-
-
DFS0
Table 3. System clock example (ADC Slave Mode)
0
1
0
1
11.2896
12.2880
11.2896
12.2880
(Note: ADC is always in Normal Speed Mode)
192fs
128fs
256fs
8.1920
-
-
-
Normal Speed Mode
Double Speed Mode
Quad Speed Mode
11.2896
12.2880
Not Available
8.1920
256fs
MCLKB (MHz)
16.9344
18.4320
12.2880
16.9344
18.4320
192fs
384fs
DAC Sampling Speed (fs)
MCLKA (MHz)
MCLKA (MHz)
- 15 -
12.2880
16.9344
18.4320
384fs
22.5792
24.5760
16.3840
22.5792
24.5760
256fs
512fs
120kHz~192kHz
32kHz~48kHz
64kHz~96kHz
16.3840
22.5792
24.5760
512fs
-
33.8688
36.8640
24.5760
33.8688
36.8640
384fs
768fs
24.5760
33.8688
36.8640
768fs
(default)
BICKA (MHz)
BICKA (MHz)
Sampling
Normal
Speed
5.6448
6.1440
2.0480
2.8224
3.0720
64fs
64fs
[AK4682]
2007/07