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ADAU1361BCPZ-R7 데이터시트(PDF) 51 Page - Analog Devices |
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ADAU1361BCPZ-R7 데이터시트(HTML) 51 Page - Analog Devices |
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51 / 78 page ![]() Data Sheet ADAU1361 CONTROL REGISTERS analog.com Rev. E | 51 of 78 Table 38. ALC Control 0 Register (Continued) Bits Bit Name Description 10 96 ms 11 Off [5:3] ALCMAX[2:0] The maximum ALC gain sets a limit to the amount of gain that the ALC can provide to the input signal. This protects small signals from excessive amplification. Setting Maximum ALC Gain 000 −12 dB (default) 001 −6 dB 010 0 dB 011 6 dB 100 12 dB 101 18 dB 110 24 dB 111 30 dB [2:0] ALCSEL[2:0] ALC select. These bits set the channels that are controlled by the ALC. When set to right only, the ALC responds only to the right channel input and controls the gain of the right PGA amplifier only. When set to left only, the ALC responds only to the left channel input and controls the gain of the left PGA amplifier only. When set to stereo, the ALC responds to the greater of the left or right channel and controls the gain of both the left and right PGA amplifiers. These bits must be off if manual control of the volume is desired. Setting Channels 000 Off (default) 001 Right only 010 Left only 011 Stereo 100 Reserved 101 Reserved 110 Reserved 111 Reserved R12: ALC Control 1, 16,402 (0x4012) Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 ALCHOLD[3:0] ALCTARG[3:0] Table 39. ALC Control 1 Register Bits Bit Name Description [7:4] ALCHOLD[3:0] ALC hold time. The ALC hold time is the amount of time that the ALC waits after a decrease in input level before increasing the gain to achieve the target level. The recommended minimum setting is 21 ms (0011) to prevent distortion of low frequency signals. The hold time doubles with every 1-bit increase. Setting Hold Time 0000 2.67 ms (default) 0001 5.34 ms 0010 10.68 ms 0011 21.36 ms 0100 42.72 ms 0101 85.44 ms 0110 170.88 ms 0111 341.76 ms 1000 683.52 ms 1001 1.367 sec 1010 2.7341 sec |
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