lm4935rlx National Semiconductor Corporation, lm4935rlx Datasheet - Page 36

• Manufacturer Part Number: lm4935rlx
• Description: Audio Sub-system With Dual-mode Stereo Headphone And Mono High Efficiency Loudspeaker Amplifiers And Multi-purpose Adc
• Manufacturer: National Semiconductor Corporation

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Bits
12.0 Status & Control Registers
12.14 AGC_3 CONFIGURATION REGISTER
This register is used to control the LM4935’s Automatic Gain Control. (Note 18)
Note 18: See the AGC overview.
4:0
7:5
AGC_HOLDTIME
AGC_ATTACK
Field
Programs the amount of delay before the AGC algorithm begins to adjust the gain of the
microphone preamplifier.
Programs the speed at which the AGC will reduce gains if it detects the input level is too large.
AGC_HOLDTIME
00100
AGC_ATTACK
00000
00001
00010
00011
11101
TABLE 15. AGC_3 (0x0Ah)
11110
11111
2
000
001
010
100
101
011
110
111
to 11100
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
(Continued)
2
36
Description
No. of speech segments
Step Time (ms)
4 to 28
1024
2048
4096
128
256
512
29
30
31
32
64
0
1
2
3