ak4359 AKM Semiconductor, Inc., ak4359 Datasheet - Page 12

• Manufacturer Part Number: ak4359
• Description: 106db 192khz 24-bit 8ch Dac
• Manufacturer: AKM Semiconductor, Inc.

ASAHI KASEI
The external clocks, which are required to operate the AK4359, 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 bit
= “0”: Register 00H), the sampling speed is set by DFS0-1 bits (Table 1). The frequency of MCLK at each sampling speed
is set automatically. (Table 2~Table 4) In Auto Setting Mode (ACKS bit = “1”: Default), 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 DFS0-1.
In parallel control mode, the sampling speed can be set by only ACKS pin. When ACKS pin = “L”, the AK4359 operates
by Normal Speed Mode. When ACKS pin = “H”, Auto setting mode is enabled. The parallel control mode does not
support 128fs and 192fs of Double Speed Mode.
All external clocks (MCLK, BICK and LRCK) should always be present whenever the AK4359 is in the normal operation
mode (RSTB pin = ”H”). If these clocks are not provided, the AK4359 may draw excess current and may fall into
unpredictable operation. This is because the device utilizes dynamic refreshed logic internally. The AK4359 should be
reset by RSTB pin = “L” after threse clocks are provided. If the external clocks are not present, the AK4359 should be in
the power-down mode (RSTB pin = ”L”). After exiting reset(RSTB = “↑”) at power-up etc., the AK4359 is in the
power-down mode until MCLK is input.
MS0289-E-02
System Clock
32.0kHz
44.1kHz
48.0kHz
LRCK
fs
11.2896MHz 16.9344MHz 22.5792MHz 33.8688MHz
12.2880MHz 18.4320MHz 24.5760MHz 36.8640MHz
Table 2. System Clock Example (Normal Speed Mode @Manual Setting Mode)
8.1920MHz 12.2880MHz 16.3840MHz 24.5760MHz
256fs
DFS1
0
0
1
Table 1. Sampling Speed (Manual Setting Mode)
DFS0
384fs
0
1
0
OPERATION OVERVIEW
Normal Speed Mode
Double Speed Mode
Quad Speed Mode
MCLK
512fs
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Sampling Rate (fs)
768fs
120kHz~192kHz
60kHz~96kHz
8kHz~48kHz
36.8640MHz
1152fs
N/A
N/A
Default
2.0480MHz
2.8224MHz
3.0720MHz
BICK
64fs
[AK4359]
2006/03