AK4440 AKM [Asahi Kasei Microsystems], AK4440 Datasheet - Page 11

• Manufacturer Part Number: AK4440
• Description: 192kHz 24-Bit 8ch DAC with 2Vrms Output
• Manufacturer: AKM [Asahi Kasei Microsystems]

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The external clocks, which are required to operate the AK4440, 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 DFS1-0 bits
for each sampling speed is set automatically.
MCLK frequency is detected automatically
(Table
In parallel control mode, the sampling speed can be set by only the ACKS pin. When ACKS pin = “L”, the AK4440
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.
The AK4440 is automatically placed in power saving mode when MCLK, LRCK and BICK stop during normal
operation mode, and the analog output is forced to 0V(typ). When MCLK, LRCK and BICK are input again, the
AK4440 is powered up. After power-up, the AK4440 is in the power-down mode until MCLK, LRCK and BICK are
input.
MS1088-E-01
System Clock
6), it is not necessary to set DFS1-0 bits.
32.0kHz
44.1kHz
48.0kHz
LRCK
Table 2. System Clock Example (Normal Speed Mode @Manual Setting Mode) (N/A: Not available)
fs
8.1920MHz
11.2896MHz
12.2880MHz
DFS1 bit
256fs
0
0
1
DFS0 bit
Table 1. Sampling Speed (Manual Setting Mode)
12.2880MHz
16.9344MHz
18.4320MHz
0
1
0
384fs
(Table
OPERATION OVERVIEW
(Table 2~Table
Normal Speed Mode
Double Speed Mode
Quad Speed Mode
5), and the internal master clock becomes the appropriate frequency
16.3840MHz
22.5792MHz
24.5760MHz
MCLK
512fs
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4) In auto setting mode (ACKS bit = “1”: Default), as
Sampling Rate (fs)
24.5760MHz
33.8688MHz
36.8640MHz
768fs
120kHz~192kHz
60kHz~96kHz
8kHz~48kHz
(Table
36.8640MHz
1152fs
N/A
N/A
1). The frequency of MCLK
(default)
2.0480MHz
2.8224MHz
3.0720MHz
BICK
64fs
[AK4440]
2011/03