ak4395 AKM Semiconductor, Inc., ak4395 Datasheet - Page 11

• Manufacturer Part Number: ak4395
• Description: Advanced Multi-bit 192khz 24-bit ?? Dac
• Manufacturer: AKM Semiconductor, Inc.

ASAHI KASEI
The external clocks, which are required to operate the AK4395, are MCLK, LRCK and BICK. The master clock (MCLK)
should be synchronized with LRCK but the phase is not critical. The MCLK is used to operate the digital interpolation
filter and the delta-sigma modulator. There are two methods to set MCLK frequency. In Manual Setting Mode (ACKS =
“0”: Register 00H), the sampling speed is set by DFS0/1(Table 1). CKS0/1/2 set the frequency of MCLK at each sampling
speed (Table 2). In Auto Setting Mode (ACKS = “1”: Default), as MCLK frequency is detected automatically (Table 6),
and the internal master clock becomes the appropriate frequency, it is not necessary to set DFS0/1 and CKS0/1/2. In
parallel mode, CKS2 and DFS1 are fixed to “0”.
All external clocks (MCLK, BICK and LRCK) should always be present whenever the AK4395 is in normal operation
mode (PD = “H”). If these clocks are not provided, the AK4395 may draw excess current because the device utilizes
dynamic refreshed logic internally. If the external clocks are not present, the AK4395 should be in the power-down mode
(PDN = “L”) or in the reset mode (RSTN = “0”). After exiting reset at power-up etc., the AK4395 is in power-down mode
until MCLK and LRCK are input.
MS0040-E-01
System Clock
32.0kHz
44.1kHz
48.0kHz
LRCK
fs
Table 3. System clock example (Normal Speed Mode @Manual Setting Mode)
Mode
0
1
2
3
4
5
6
7
Note: The master clock at quad speed supports only 128fs or 192fs.
DFS1
11.2896MHz
12.2880MHz
8.1920MHz
0
0
1
256fs
CKS2
Table 1. Sampling Speed (Manual Setting Mode)
Table 2. System Clocks (Manual Setting Mode)
0
0
0
0
1
1
1
1
DFS0
0
1
0
12.2880MHz
16.9344MHz
18.4320MHz
CKS1
OPERATION OVERVIEW
0
0
1
1
0
0
1
1
Normal Speed Mode
Double Speed Mode
Quad Speed Mode
384fs
CKS0
MCLK
0
1
0
1
0
1
0
1
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16.3840MHz
22.5792MHz
24.5760MHz
Sampling Rate (fs)
512fs
Normal
256fs
256fs
384fs
384fs
512fs
512fs
768fs
768fs
24.5760MHz
33.8688MHz
36.8640MHz
120kHz~216kHz
60kHz~108kHz
30kHz~54kHz
Double
128fs
256fs
192fs
384fs
256fs
384fs
768fs
N/A
N/A
Quad
128fs
192fs
N/A
N/A
N/A
N/A
N/A
N/A
2.0480MHz
2.8224MHz
3.0720MHz
BICK
64fs
Default
Default
[AK4395]
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