AK4601VQ Datasheet, PDF (81/111 Pages) Asahi Kasei Microsystems – Audio HUB CODEC with Digital Mixer

[AK4601]
4-1. Input Selector Switching Sequence
The input selector should be changed after enabling soft mute function to reduce the switching noise of
the input selector.
ADC2 Input selector switching sequence:
1) Enable Soft Mute Function before Changing Channel
2) Change Channel
3) Disable Soft Mute Function
AD2MUTE bit
(2)
DATT Level
(1)
(1)
Attenuation
(3)
-∞
Channel
IN3L/IN3R
IN4L/IN4R
Figure 70. ADC2 Input Channel Switching Sequence Example
The period of (1) varies according to the setting value of the DATT level. Transition time of attenuation
level from 0dB to - is shown below.
ATSPAD _{LRCK Cycle}
(1) Period (max)
fs=48kHz fs=44.1kHz fs=8kHz
0
828/fs
17.25ms
18.78ms 103.5ms (default)
1
828/fs x 4
69ms
75.10ms 414ms
The input channel should be changed during the period (2). An interval around 200ms is needed before
releasing the soft mute after changing the channel (period (3)).
5. ADC Digital Filter Select
The AK4601 has four kinds of digital filters in ADC block. ADSD and ADSL bits select a digital filter.
Mode ADSD bit ADSL bit
Digital Filter
0
0
0
Sharp Roll-Off Filter
(default)
1
0
1
Slow Roll-Off Filter
2
1
0
Short Delay Sharp Roll-Off Filter
3
1
1
Short Delay Slow Roll-Off Filter
Table 51. ADC Digital Filter Select
6. ADC Full Scale Voltage
Single-ended input amplitude (differential input amplitude) of ADC1 L/Rch, ADC2 L/Rch and ADCM can
be switched between 2.3Vpp (±2.3Vpp) and 2.83Vpp (±2.83Vpp) by ADC1VL/R bit, ADC2VL/R bit and
ADCMV bit, respectively (Table 52).
Mode
0
1
ADC1VL, ADC1VR, ADC2VL,
Full Scale
ADC2VR, ADCMV
Single-end Differential
0
2.3Vpp ±2.3Vpp
1
2.83Vpp ±2.83Vpp
Table 52. ADC Input Voltage
(default)
016000391-E-01
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2016/12