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WM8352 Datasheet(PDF) 66 Page - Wolfson Microelectronics plc |
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WM8352 Datasheet(HTML) 66 Page - Wolfson Microelectronics plc |
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66 / 336 page  WM8352 Production Data w PD, February 2011, Rev 4.4 66 13.4.4 CONTROLLING THE PRE-AMPLIFIER GAINS The gain of each microphone pre-amplifier is controlled by writing to the appropriate control registers. The gain of each pre-amplifier applies to all three inputs associated with that pre-amplifier, whether inverting or non-inverting. Although the gain settings for each pre-amplifier are in two separate registers, both gains can be changed simultaneously using the IN_VU bit (see Table 22). Additionally, it is also possible to control the gain updates to only occur when the respective signal crosses through zero. This feature reduces clicking noise caused by gain changes. ADDRESS BIT LABEL DEFAULT DESCRIPTION R80 (50h) Left Input Volume 14 INL_MUTE 0 Mute control for left channel input PGA: 0 = Input PGA not muted, normal operation 1 = Input PGA muted (and disconnected from the following input record mixer). 13 INL_ZC 0 Left channel input PGA zero cross enable: 0 = Update gain when gain register changes 1 = Update gain on 1st zero cross after gain register write. 8 IN_VU 0 Input left PGA and input right PGA volume do not update until a 1 is written to either IN_VU register bit. 7:2 INL_VOL [5:0] 01_0000 Left channel input PGA volume 000000 = -12dB 000001 = -11.25dB . 010000 = 0dB . 111111 = 35.25dB R81 (51h) Right Input Volume 14 INR_MUTE 0 Mute control for right channel input PGA: 0 = Input PGA not muted, normal operation 1 = Input PGA muted (and disconnected from the following input record mixer). 13 INR_ZC 0 Right channel input PGA zero cross enable: 0 = Update gain when gain register changes 1 = Update gain on 1st zero cross after gain register write. 8 IN_VU 0 Input left PGA and input right PGA volume do not update until a 1 is written to either IN_VU register bit. 7:2 INR_VOL [5:0] 01_0000 Right channel input PGA volume 000000 = -12dB 000001 = -11.25dB . 010000 = 0dB . 111111 = 35.25dB Table 22 Controlling the Microphone Pre-amplifier Gain |
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