ak4628 AKM Semiconductor, Inc., ak4628 Datasheet - Page 16

• Manufacturer Part Number: ak4628
• Description: High Performance Multi Channel Audio Codec
• Manufacturer: AKM Semiconductor, Inc.

ASAHI KASEI
T System Clock
The external clocks, which are required to operate the AK4628, are MCLK, LRCK and BICK. MCLK should be
synchronized with LRCK but the phase is not critical. There are two methods to set MCLK frequency. In Manual Setting
Mode (ACKS = “0”: Default), the sampling speed is set by DFS0, DFS1 (Table 1). The frequency of MCLK at each
sampling speed is set automatically. (Table 2, 3, 4). In Auto Setting Mode (ACKS = “1”), as MCLK frequency is detected
automatically (Table 5), and the internal master clock becomes the appropriate frequency (Table 6), it is not necessary to
set DFS.
External clocks (MCLK, BICK) should always be present whenever the AK4628 is in normal operation mode (PDN =
“H”). If these clocks are not provided, the AK4628 may draw excess current because the device utilizes dynamic
refreshed logic internally. If the external clocks are not present, the AK4628 should be in the power-down mode (PDN =
“L”) or in the reset mode (RSTN = “0”). After exiting reset at power-up etc., the AK4628 is in the power-down mode until
MCLK and LRCK are input.
MS0211-E-02
(Note: At Double speed mode(DFS1= “0”, DFS0 = “1”), 128fs and 192fs are not available for ADC.)
(Note: At Quad speed mode(DFS1= “1”, DFS0 = “0”) are not available for ADC.)
Table 2. System Clock Example (Normal Speed Mode @Manual Setting Mode)
Table 3. System Clock Example (Double Speed Mode @Manual Setting Mode)
Table 4. System Clock Example (Quad Speed Mode @Manual Setting Mode)
176.4kHz
192.0kHz
DFS1
88.2kHz
96.0kHz
32.0kHz
44.1kHz
48.0kHz
LRCK
LRCK
LRCK
0
0
1
fs
fs
fs
DFS0
0
1
0
Table 1. Sampling Speed (Manual Setting Mode)
11.2896
12.2880
22.5792
24.5760
11.2896
12.2880
128fs
128fs
256fs
8.1920
Normal Speed Mode
Double Speed Mode
Quad Speed Mode
OPERATION OVERVIEW
MCLK (MHz)
MCLK (MHz)
MCLK (MHz)
16.9344
18.4320
12.2880
16.9344
18.4320
192fs
192fs
384fs
Sampling Speed (fs)
-
-
- 16 -
22.5792
24.5760
16.3840
22.5792
24.5760
120kHz~192kHz
256fs
256fs
512fs
32kHz~48kHz
64kHz~96kHz
-
-
BICK (MHz)
BICK (MHz)
BICK (MHz)
11.2896
12.2880
5.6448
6.1440
2.0480
2.8224
3.0720
64fs
64fs
64fs
Default
[AK4628]
2004/03