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WM8904ECS/R Datasheet(PDF) 55 Page - Wolfson Microelectronics plc |
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WM8904ECS/R Datasheet(HTML) 55 Page - Wolfson Microelectronics plc |
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55 / 188 page  Pre-Production WM8904 w PP, Rev 3.3, September 2012 55 GAIN LIMITS The minimum and maximum gain applied by the DRC is set by register fields DRC_MINGAIN and DRC_MAXGAIN. These limits can be used to alter the DRC response from that illustrated in Figure 29. If the range between maximum and minimum gain is reduced, then the extent of the dynamic range control is reduced. The maximum gain prevents quiet signals (or silence) from being excessively amplified. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R41 (29h) DRC Control 1 3:2 DRC_MINGAIN [1:0] 10 Minimum gain the DRC can use to attenuate audio signals 00 = 0dB (default) 01 = -6dB 10 = -12dB 11 = -18dB 1:0 DRC_MAXGAIN [1:0] 00 Maximum gain the DRC can use to boost audio signals 00 = 12dB 01 = 18dB (default) 10 = 24dB 11 = 36dB Table 17 DRC Gain Limits DYNAMIC CHARACTERISTICS The dynamic behaviour determines how quickly the DRC responds to changing signal levels. Note that the DRC responds to the average (RMS) signal amplitude over a period of time. DRC_ATK determines how quickly the DRC gain decreases when the signal amplitude is high. DRC_DCY determines how quickly the DRC gain increases when the signal amplitude is low. These register fields are described in Table 18. Note that the register defaults are suitable for general purpose microphone use. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R41 (29h) DRC Control 1 15:12 DRC_ATK [3:0] 0011 Gain attack rate (seconds/6dB) 0000 = Reserved 0001 = 182µs 0010 = 363µs 0011 = 726µs (default) 0100 = 1.45ms 0101 = 2.9ms 0110 = 5.8ms 0111 = 11.6ms 1000 = 23.2ms 1001 = 46.4ms 1010 = 92.8ms 1011-1111 = Reserved |
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