參數(shù)資料
型號: VCT3801A
廠商: MICRONAS SEMICONDUCTOR HOLDING AG
英文描述: Video/Controller/Teletext IC Family
中文描述: 視頻/控制/圖文電視IC系列
文件頁數(shù): 85/172頁
文件大小: 2243K
代理商: VCT3801A
ADVANCE INFORMATION
VCT 38xxA
Micronas
85
4. Audio Processing
4.1. Introduction
The audio processing allows input selection and vol-
ume control for mono audio sources either from tuner
or from SCART input.
Fig. 4–1:
Audio processing
4.2. Input Select
Both audio output channels can be switched to any of
the three audio input channels. Only the audio output
channel AOUT1 can be volume controlled.
4.3. Volume Control
The analog volume control covers a range from
+18 dB and
75 dB. The lowest step is the mute posi-
tion. Step size is split into a 3-dB and a 1.5-dB range.
75 dB...
54 dB :
54 dB...+18 dB : 1.5 dB step size
3 dB step size
4.4. I
2
C-Bus Slave Interface
The input selection and analog volume is controlled via
the audio control register ACON. This I
2
C register is
activated by the chip address of the video back-end
processing (see Table 2–2 on page 32).
AOUT1
AIN3
AIN1
AIN2
AOUT2
Table 4–1:
Audio control register
I
2
C Sub
address
Number
of bits
Mode
Function
Default
Name
h’34
16
w
Audio Control
bit [5:0]
volume control
000000
000001
...
000111
001000
...
101011
101100
101101
...
110110
110111
111000
reserved
audio input select 1
00
01
10
11
audio input select 2
00
01
10
11
low power mode
0
1
reserved
mute
75db
57.0dB
54.0dB
1.5dB
0.0dB
+1.5dB
+15.0dB
+16.5dB
+18.0dB
bit [7:6]
bit [9:8]
mute
AIN1
AIN2
AIN3
bit [11:10]
mute
AIN1
AIN2
AIN3
bit[12]
disable low power mode
enable low power mode
bit[15:13]
0
ACON
AVOL
ASEL1
ASEL2
ALPM
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