参数资料
型号: UDA1380TT
厂商: NXP SEMICONDUCTORS
元件分类: 消费家电
英文描述: Stereo audio coder-decoder for MD, CD and MP3
中文描述: SPECIALTY CONSUMER CIRCUIT, PDSO32
封装: 6.10 MM, 0.65 MM PITCH, PLASTIC, MO-153, SOT-487-1, TSSOP-32
文件页数: 42/68页
文件大小: 426K
代理商: UDA1380TT
2004 Apr 22
47
NXP Semiconductors
Product specification
Stereo audio coder-decoder
for MD, CD and MP3
UDA1380
11.14 AGC settings
Table 60 Register address 23H
Table 61 Description of register bits
Table 62 AGC time constant setting bits
BIT
151413
12
11
10
9
8
Symbol
AGC_TIME2
AGC_TIME1
AGC_TIME0
Default
0
0000
BIT
7
6
5
4
3210
Symbol
AGC_LEVEL1
AGC_LEVEL0
AGC_EN
Default
0
0000
BIT
SYMBOL
DESCRIPTION
15 to 11
Default value 00000.
10 to 8
AGC_TIME[2:0]
AGC time constant settings. A 3-bit value to set the AGC time constants, being the
attack and decay time constants. The given constants are for 44.1 and 8 kHz
sampling frequencies, and must be scaled either down or up according to the
sampling frequency used. Default value 000, see Table 62.
7to4
default value 0000
3 and 2
AGC_LEVEL[1:0]
AGC target level settings. A 2-bit value to set the AGC target level.
Default value 00, see Table 63.
1
default value 0
0AGC_EN
AGC enable control. A 1-bit value to enable or disable the AGC. When the AGC is
enabled, the bit SKIP_DCFIL must be set to logic 0 to avoid disturbance on the
output signal due to the DC offset added in the ADC. When this bit is logic 0: AGC off,
manual gain control via the left and right decimator volume control. When this bit is
logic 1: AGC enabled, with manual microphone gain setting via VGA. Default value 0.
AGC_TIME2
AGC_TIME1
AGC_TIME0
AGC SETTING
44.1 kHz SAMPLING
8 kHz SAMPLING
ATTACK TIME
(ms)
DECAY TIME
(ms)
ATTACK TIME
(ms)
DECAY TIME
(ms)
0
11
100
61
551 (default)
0
1
16
100
88.2
551
0
1
0
11
200
61
1102
0
1
16
200
88.2
1102
1
0
21
200
116
1102
1
0
1
11
400
61
2205
1
0
16
400
88.2
2205
1
21
400
116
2205
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