AK4601VQ Datasheet, PDF (78/111 Pages) Asahi Kasei Microsystems – Audio HUB CODEC with Digital Mixer

[AK4601]
■ ADC Block (ADC1, ADC2, ADCM)
1. ADC Block High Pass Filter
The AK4601 has a digital high pass filter (HPF) for DC offset cancelling of each ADC. The cut-off
frequency of the HPF is about 0.93Hz (fs=48kHz), depending on operation frequency.
fs
48kHz
44.1kHz
Cut-off Frequency
0.93Hz
0.86Hz
Table 44. HPF Cut-off Frequency
8kHz
0.16Hz
2. ADC Digital Volume
The AK4601 has independent digital volume controls for Lch and Rch (256 levels, 0.5dB steps) of each
ADC.
ADC1
VOLAD1L[7:0]
00h
01h
02h
:
2Fh
30h
31h
:
FDh
FEh
FFh
ADC1
ADC2
ADC2
ADCM
VOLAD1R[7:0] VOLAD2L[7:0] VOLAD2R[7:0] VOLADM[7:0]
00h
00h
00h
00h
01h
01h
01h
01h
02h
02h
02h
02h
:
:
:
:
2Fh
2Fh
2Fh
2Fh
30h
30h
30h
30h
31h
31h
31h
31h
:
:
:
:
FDh
FDh
FDh
FDh
FEh
FEh
FEh
FEh
FFh
FFh
FFh
FFh
Table 45. ADC Digital Volume Control Setting
Attenuation
Level
+24.0dB
+23.5dB
+23.0dB
:
+0.5dB
0.0dB
-0.5dB
:
-102.5dB
-103.0dB
Mute (-∞)
(default)
The transition time between set values is selected by ATSPAD bit.
Mode ATSPAD bit ATT speed
0
0
4/fs
(default)
1
1
16/fs
Table 46. ADC Volume Level Transition Time
When changing output levels, transitions are executed via soft changes; thus no switching noise occurs
during these transitions. In Mode 0, it takes 1020/fs (21.3ms@fs=48kHz) from 00H(0dB) to FFH(MUTE).
If the PDN pin goes to “L”, each channel of the ADC is initialized to 30H.
ATSPAD bit
00h ↔ FFh Transition Time
LRCK Cycle
fs=48kHz fs=44.1kHz fs=8kHz
0
1020/fs
21.3ms
23.1ms 127.5ms
1
4080/fs
85.0ms
92.5ms 510.0ms
Table 47. ADC Volume Transition Time between 00h and FFh
(default)
016000391-E-01
- 78 -
2016/12