AK4356 Datasheet, PDF (13/29 Pages) Asahi Kasei Microsystems – 192kHz 24 Bit IX-CHANNEL DAC FOR DVD-AUDIO

ASAHI KASEI
[AK4356]
OPERATION OVERVIEW
n System Clock Input
The external clocks which are required to operate the AK4356 are MCLK, LRCK and BICK. The master clock (MCLK)
should be synchronized with sampling clock (LRCK) but the phase is not critical. MCLK is used to operate the digital
interpolation filter and the delta-sigma modulator. The frequency of MCLK can be set by CKS0-2, and can be selected to
normal, double or 4 times speed mode by DFS0-1 (See Table 1). 4 times speed mode can be used for only DAC1. If DAC1
is in 4 times speed mode, DAC2 and DAC3 are automatically powered down. When the states of SLOW, DIF2-0, DFS1-0
or CKS2-0 changes, the AK4356 should be reset by PDN pin or RSTN bit.
All external clocks (MCLK, BICK and LRCK) should always be present whenever the AK4356 is in normal operation
mode (PDN = “H”). If these clocks are not provided, the AK4356 may draw excess current and may not possibly operate
properly because the device utilizes dynamic refreshed logic internally. If the external clocks are not present, the AK4356
should be in the power-down mode (PDN = “L” or all DACs are set in the power-down mode by PW1-3 bits) or in the reset
mode (RSTN = “0”). After exiting reset at power-up etc., the AK4356 is in the power-down mode until MCLK and LRCK
are input.
Mode
0
1
2
3
4
5
6
7
CKS2
0
0
0
0
1
1
1
1
DFS1-0
CKS1 CKS0
“00”
“01”
(Normal Speed) (Double Speed)
0
0
256fs
128fs
0
1
256fs
256fs
1
0
384fs
192fs
1
1
384fs
384fs
0
0
512fs
256fs
0
1
512fs
N/A
1
0
768fs
384fs
1
1
768fs
N/A
Table 1. System Clock (DFS1-0 = “11”: reserved)
“10”
(4 times Speed)
N/A
N/A
N/A
N/A
128fs
N/A
192fs
N/A
default (DFS1-0 = “00”)
fs [kHz]
32
64
128
44.1
88.2
176.4
48
96
192
Mode
Normal
Double
4 times
Normal
Double
4 times
Normal
Double
4 times
128fs
192fs
256fs
384fs
-
-
8.1920 12.2880
8.1920 12.2880 16.3840 24.5760
16.3840 24.5760
-
-
-
-
11.2896 16.9344
11.2896 16.9344 22.5792 33.8688
22.5792 33.8688
-
-
-
-
12.2880 18.4320
12.2880 18.4320 24.5760 36.8640
24.5760 36.8640
-
-
Table 2. Example of System Clock [MHz]
512fs
16.3840
-
-
22.5792
-
-
24.5760
-
-
768fs
24.5760
-
-
33.8688
-
-
36.8640
-
-
M0072-E-01
- 13 -
1999/09