AK4601VQ Datasheet, PDF (80/111 Pages) Asahi Kasei Microsystems – Audio HUB CODEC with Digital Mixer

[AK4601]
3. ADC Soft Mute
The ADC block has a digital soft mute circuit. The soft mute operation is performed at digital domain.
The output signal is attenuated to -∞ in “ATT setting level x ATT transition time” from the current ADC
digital volume setting level by setting AD1MUTE bit, AD2MUTE bit or ADMMUTE bit to “1”. When the
AD1MUTE bit, AD2MUTE bit or ADMMUTE bit returns to “0”, the mute is cancelled and the output
attenuation level gradually changes to ATT setting level in “ATT setting level x ATT transition time”. If the
soft mute is cancelled before attenuating to -∞ after starting the operation, the attenuation is
discontinued and the volume level returns to original volume setting level by the same cycle. The soft
mute is effective for changing the signal source without stopping the signal transmission.
The attenuation level transition takes 828/fs from 0dB to -∞ and from -∞ to 0dB. Soft mute function is
available when each ADC is in operation. The attenuation value is initialized by setting the PDN pin = “L”.
AD1MUTE, AD2MUTE,
ADMMUTE bit
0dB
Attenuation Level
-∞dB
Output Image
Group Delay (GD)
828/fs
GD
828/fs
4. ADC Input Selector
Figure 69. ADC Soft Mute
ADC2 of the AK4601 has an input selector for 1 stereo differential input or 2 stereo single-ended inputs,
and 1 stereo semi-differential input. Differential or single-ended input can be selected for the ADCM.
These inputs are selected by AD2SEL[1:0] bits and ADMSEL bit. In the case that these registers are
changed during operation, mute output signal to reduce switching noise as needed.
Mode
0
1
2
3
AD2SEL[1:0] bits
Selected Pins
00
AIN2LP, AIN2LN, AIN2RP, AIN2RN
01
AIN3L, AIN3R
10
AIN4L, AIN4R
11
AIN5L, AIN5R, GNDIN5
Table 49. ADC2 Input Select
(default)
Mode
0
1
ADMSEL bit
Selected Pins
0
Differential (AINMP, AINMN)
1
Single-ended (AINM)
Table 50. ADCM Input Select
(default)
016000391-E-01
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2016/12