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AK7735EQ датащи(PDF) 97 Page - Asahi Kasei Microsystems

номер детали AK7735EQ
подробное описание детали  Dual DSP with 4chADC 4chDAC 4chSRC
Download  142 Pages
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производитель  AKM [Asahi Kasei Microsystems]
домашняя страница  http://www.akm.com
Logo AKM - Asahi Kasei Microsystems

AK7735EQ датащи(HTML) 97 Page - Asahi Kasei Microsystems

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[AK7735]
016014707-E-00
2016/12
- 97 -
ADC Block
1. ADC Block High Pass Filter
The AK7735 has a digital high pass filter (HPF) for DC offset cancelling of each ADC. The cut-off
frequency of the HPF is about 0.9Hz (fs=48kHz), depending on operation frequency.
2. ADC Digital Volume
The AK7735 has independent digital volume controls for Lch and Rch (256 levels, 0.5dB steps) of each
ADC.
ADC1
VOLAD1L[7:0]
ADC1
VOLAD1R[7:0]
ADC2
VOLAD2L[7:0]
ADC2
VOLAD2R[7:0]
Attenuation
Level
00h
00h
00h
00h
+24.0dB
01h
01h
01h
01h
+23.5dB
02h
02h
02h
02h
+23.0dB
:
:
:
:
:
2Fh
2Fh
2Fh
2Fh
+0.5dB
30h
30h
30h
30h
0.0dB
(default)
31h
31h
31h
31h
-0.5dB
:
:
:
:
:
FDh
FDh
FDh
FDh
-102.5dB
FEh
FEh
FEh
FEh
-103.0dB
FFh
FFh
FFh
FFh
Mute (-
∞)
Table 49. ADC Digital Volume Control Setting
The transition time between set values is selected by ATSPAD bit.
Mode
ATSPAD bit
Transition Time
0
0
4/fs
(default)
1
1
16/fs
Table 50. ADC Volume Level Transition Time
The transition between set values is soft transition. It takes 1020/fs (21.3ms@fs=48kHz) from 00h to
FFh(MUTE) in Mode 0. If the PD
N pin goes to “L”, the volume of each ADC channel 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
(default)
1
1020/fs x4
85.0ms
92.5ms
510.0ms
Table 51. ADC Volume Transition Time from 00h to FFh


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