UMA1021M/C2 Philips Semiconductors (Acquired by NXP), UMA1021M/C2 Datasheet - Page 47

• Manufacturer Part Number: UMA1021M/C2
• Description: UDA1380; Stereo Audio Coder-decoder For MD, CD And MP3
• Manufacturer: Philips Semiconductors (Acquired by NXP)

Philips Semiconductors
11.14 AGC settings
Table 60 Register address 23H
Table 61 Description of register bits
Table 62 AGC time constant setting bits
2003 Apr 04
Symbol
Default
Symbol
Default
AGC_TIME2
15 to 11
3 and 2
10 to 8
Stereo audio coder-decoder
for MD, CD and MP3
7 to 4
BIT
BIT
BIT
1
0
0
0
0
0
1
1
1
1
AGC_TIME[2:0]
AGC_LEVEL[1:0]
AGC_EN
15
0
7
0
SYMBOL
AGC_TIME1
0
0
1
1
0
0
1
1
14
0
6
0
Default value 00000.
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.
default value 0000
AGC target level settings. A 2-bit value to set the AGC target level. Default value 00,
see Table 63.
default value 0
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_TIME0
13
0
5
0
0
1
0
1
0
1
0
1
12
0
4
0
ATTACK TIME
AGC_LEVEL1
(ms)
44.1 kHz SAMPLING
11
16
11
16
21
11
16
21
47
11
0
3
0
DESCRIPTION
DECAY TIME
AGC_LEVEL0
AGC_TIME2
(ms)
100
100
200
200
200
400
400
400
10
AGC SETTING
0
2
0
ATTACK TIME
AGC_TIME1
(ms)
88.2
88.2
88.2
116
116
61
61
61
8 kHz SAMPLING
9
0
1
0
Product specification
UDA1380
DECAY TIME
551 (default)
AGC_TIME0
AGC_EN
1102
1102
1102
2205
2205
2205
(ms)
551
8
0
0
0