ak4390 ETC-unknow, ak4390 Datasheet - Page 14

• Manufacturer Part Number: ak4390
• Description: Ultra Low Latency 32-bit ?? Dac
• Manufacturer: ETC-unknow

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The external clocks, which are required to operate the AK4390, are MCLK, BICK and LRCK. 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. Sampling speed and MCLK frequency are detected automatically and then the initial master clock
is set to the appropriate frequency
pin or RSTN bit. After exiting reset (PDN pin = “L” → “H”) at power-up etc., the AK4390 is in power-down mode until
MCLK is supplied.
The AK4390 is automatically placed in power saving mode when MCLK and LRCK stop during normal operation mode,
and the analog output is AVDD/2 (typ). When MCLK and LRCK are input again, the AK4390 is powered up. After
power-up, the AK4390 is in the power-down mode until MCLK and LRCK are input.
The MCLK frequency corresponding to each sampling speed should be provided
MCLK= 256fs/384fs supports sampling rate of 30kHz~108kHz
DR and S/N will degrade by approximately 3dB as compared to when MCLK= 512fs/768fs.
MS1046-E-00
System Clock
176.4kHz
192.0kHz
32.0kHz
44.1kHz
48.0kHz
88.2kHz
96.0kHz
LRCK
fs
Table 3. Relationship between MCLK frequency and DR, S/N (fs= 44.1kHz)
22.5792
24.5760
128fs
N/A
N/A
N/A
N/A
N/A
512fs
256fs
128fs
Table 2. System Clock Example (N/A: Not available)
(Table
33.8688
36.8640
256fs/384fs
512fs/768fs
MCLK
1152fs
192fs
N/A
N/A
N/A
N/A
N/A
MCLK
1). When external clocks are changed, the AK4390 should be reset by the PDN
OPERATION OVERVIEW
768fs
384fs
192fs
Table 1. Sampling Speed
11.2896
12.2880
22.5792
24.5760
8.1920
256fs
N/A
N/A
- 14 -
Normal
Normal
Double
MCLK (MHz)
Mode
Quad
DR,S/N
12.2880
16.9344
18.4320
33.8688
36.8640
117dB
120dB
(Table
384fs
N/A
N/A
3). But, when the sampling rate is 30kHz~54kHz,
108kHz~216kHz
16.3840
22.5792
24.5760
30kHz~108kHz
Sampling Rate
30kHz~32kHz
30kHz~54kHz
512fs
N/A
N/A
N/A
N/A
(Table
2).
24.5760
33.8688
36.8640
768fs
N/A
N/A
N/A
N/A
36.8640
1152fs
N/A
N/A
N/A
N/A
N/A
N/A
[AK4390]
2009/01