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LM4935RLEVAL Datasheet(PDF) 29 Page - Texas Instruments

Part # LM4935RLEVAL
Description  Audio Power Amplifier Series Audio Sub-System with Dual-Mode Stereo Headphone & Mono High Efficiency Loudspeaker Amplifiers and Multi-Purpose
PDF  91 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LM4935RLEVAL Datasheet(HTML) 29 Page - Texas Instruments

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LM4935, LM4935RLEVAL
www.ti.com
SNAS296D – OCTOBER 2005 – REVISED MARCH 2006
Table 4-14. AGC_2 (0x09h) (continued)
Bits
Field
Description
7
AGC_TIGHT
If set the AGC algorithm controls the microphone preamplifier more exactly. (Note 17)
AGC_TIGHT = 0
AGC_TARGET
Min Level
Max Level
0002
−6 dB
−3 dB
0012
−8 dB
−4 dB
0102
−10 dB
−5 dB
0112
−12 dB
−6 dB
1002
−14 dB
−7 dB
1012
−16 dB
−8 dB
1102
−18 dB
−9 dB
1112
−20 dB
−10 dB
AGC_TIGHT = 1
0002
−6 dB
−3 dB
0012
−8 dB
−5 dB
0102
−10 dB
−7 dB
0112
−12 dB
−9 dB
1002
−14 dB
−11 dB
1012
−16 dB
−13 dB
1102
−18 dB
−15 dB
1112
−20 dB
−17 dB
4.2.14 AGC_3 CONFIGURATION REGISTER
This register is used to control the LM4935's Automatic Gain Control. (Note 18)
Table 4-15. AGC_3 (0x0Ah)
Bits
Field
Description
4:0
AGC_HOLDTIME
Programs the amount of delay before the AGC algorithm begins to adjust the gain of the microphone
preamplifier.
AGC_HOLDTIME
No. of speech segments
000002
0
000012
1
000102
2
000112
3
001002 to 111002
4 to 28
111012
29
111102
30
111112
31
7:5
AGC_ATTACK
Programs the speed at which the AGC will reduce gains if it detects the input level is too large.
AGC_ATTACK
Step Time (ms)
0002
32
0012
64
0102
128
0112
256
1002
512
1012
1024
1102
2048
1112
4096
Copyright © 2005–2006, Texas Instruments Incorporated
Application Information
29
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Product Folder Links: LM4935 LM4935RLEVAL



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