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LM4935 Datasheet(PDF) 34 Page - National Semiconductor (TI) |
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LM4935 Datasheet(HTML) 34 Page - National Semiconductor (TI) |
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34 / 112 page  12.0 Status & Control Registers (Continued) 12.13 AGC_2 CONFIGURATION REGISTER This register is used to control the LM4935’s Automatic Gain Control. TABLE 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 0000 2 6dB 0001 2 8dB 0010 2 10 dB 0011 2 12 dB 0100 2 to 11002 14 dB to 30 dB 1101 2 32 dB 1110 2 34 dB 1111 2 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) 000 2 32 001 2 64 010 2 128 011 2 256 100 2 512 101 2 1024 110 2 2048 111 2 4096 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 000 2 −6 dB −3 dB 001 2 −8 dB −4 dB 010 2 −10 dB −5 dB 011 2 −12 dB −6 dB 100 2 −14 dB −7 dB 101 2 −16 dB −8 dB 110 2 −18 dB −9 dB 111 2 −20 dB −10 dB AGC_TIGHT = 1 000 2 −6 dB −3 dB 001 2 −8 dB −5 dB 010 2 −10 dB −7 dB 011 2 −12 dB −9 dB 100 2 −14 dB −11 dB 101 2 −16 dB −13 dB 110 2 −18 dB −15 dB 111 2 −20 dB −17 dB Note 17: The AGC can be used to control the analog path of the microphone to the output stages or to optimize the microphone path for recording on the ADC. When the analog path is used this bit should be set to ensure the target is tightly adhered to. If the ADC is the only destination of the microphone or the desired analog mixer level is line level then AGC_TIGHT should be cleared, allowing greater dynamic rage of the recorded signal. For further details see the AGC overview. www.national.com 34 |
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