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LM4935RLEVAL Datasheet(PDF) 28 Page - Texas Instruments |
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LM4935RLEVAL Datasheet(HTML) 28 Page - Texas Instruments |
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28 / 91 page  LM4935, LM4935RLEVAL SNAS296D – OCTOBER 2005 – REVISED MARCH 2006 www.ti.com Table 4-13. AGC_1 (0x08h) (continued) Bits Field Description 4 NOISE_GATE_ON If set, signals below the noise gate threshold are muted.The noise gate is only activated after a set period of signal absence. 7:5 NOISE_ This field sets the expected background noise level relative to the peak signal level. The sole presence of GATE_ signals below this level will not result in an AGC gain change of the input and will be gated from the ADC THRES output if the NOISE_GATE_ON is set. This level must be set even if the noise gate is not in use as it is required by the AGC algorithm. NOISE_GATE_THRES Level 0002 −72 dB 0012 −66 dB 0102 −60 dB 0112 −54 dB 1002 −48 dB 1012 −42 dB 1102 −36 dB 1112 −30 dB 4.2.13 AGC_2 CONFIGURATION REGISTER This register is used to control the LM4935's Automatic Gain Control. Table 4-14. AGC_2 (0x09h) Bits Field Description 3:0 AGC_MAX_GAIN This programs the maximum gain that the AGC algorithm can apply to the microphone preamplifier. AGC_MAX_GAIN Max Preamplifier Gain 00002 6 dB 00012 8 dB 00102 10 dB 00112 12 dB 01002 to 11002 14 dB to 30 dB 11012 32 dB 11102 34 dB 11112 36 dB 6:4 AGC_DECAY Programs the speed at which the AGC will increase gains if it detects the input level is a quiet signal. AGC_DECAY Step Time (ms) 0002 32 0012 64 0102 128 0112 256 1002 512 1012 1024 1102 2048 1112 4096 28 Application Information Copyright © 2005–2006, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: LM4935 LM4935RLEVAL |
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