AK4355 Datasheet, PDF (10/24 Pages) Asahi Kasei Microsystems – 192kHz 24-Bit 6ch DAC for DVD-Audio

ASAHI KASEI
[AK4355]
OPERATION OVERVIEW
n System Clock
The external clo cks, which are required to operate the AK4355, 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). The frequency of MCLK at each sampling speed is set
automatically. (Table 2~4). In Auto Setting Mode (ACKS = “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.
All external clocks (MCLK,BICK and LRCK) should always be present whenever the AK4355 is in the normal operation
mode (PDN= ”H”). If these clocks are not provided, the AK4355 may draw excess current may fall into unpredictable
operation. This is because the device utilizes dynamic refreshed logic internally. The AK4355 should be reset by PDN= ”L”
after threse clocks are provided. If the external clocks are not present, the AK4355 should be in the power-down mode
(PDN=”L”). After exiting reset at power-up etc., the AK4355 is in the power-down mode until MCLK and LRCK are input.
DFS1
0
0
1
DFS0
0
1
0
Sampling Rate (fs)
Normal Speed Mode
8kHz~48kHz
Double Speed Mode
60kHz~96kHz
Quad Speed Mode
120kHz~192kHz
Default
Table 1. Sampling Speed (Manual Setting Mode)
LRCK
fs
32.0kHz
44.1kHz
48.0kHz
256fs
8.1920MHz
11.2896MHz
12.2880MHz
MCLK
384fs
512fs
12.2880MHz 16.3840MHz
16.9344MHz 22.5792MHz
18.4320MHz 24.5760MHz
768fs
24.5760MHz
33.8688MHz
36.8640MHz
BICK
64fs
2.0480MHz
2.8224MHz
3.0720MHz
Table 2. System Clock Example (Normal Speed Mode @Manual Setting Mode)
LRCK
fs
88.2kHz
96.0kHz
128fs
11.2896MHz
12.2880MHz
MCLK
192fs
256fs
16.9344MHz 22.5792MHz
18.4320MHz 24.5760MHz
384fs
33.8688MHz
36.8640MHz
BICK
64fs
5.6448MHz
6.1440MHz
Table 3. System Clock Example (Double Speed Mode @Manual Setting Mode)
LRCK
fs
176.4kHz
192.0kHz
MCLK
128fs
192fs
22.5792MHz 33.8688MHz
24.5760MHz 36.8640MHz
BICK
64fs
11.2896MHz
12.2880MHz
Table 4. System Clock Example (Quad Speed Mode @Manual Setting Mode)
MS0063-E-01
- 10 -
2002/07