Datenblatt-Suchmaschine für elektronische Bauteile |
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AD1981BLJST-REEL Datenblatt(PDF) 11 Page - Analog Devices |
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AD1981BLJST-REEL Datenblatt(HTML) 11 Page - Analog Devices |
11 / 28 page REV. 0 AD1981BL –11– Headphones Volume Register (Index 04h) *For AC ’97 compatibility, Bit D7 (RM) is available only by setting the MSPLT bit, Register 76h. The MSPLT bit enables separate mute bits for the left and right channels. If MSPLT is not set, RM bit has no effect. All registers not shown, and bits containing an X are assumed to be reserved. Refer to Table I for examples. This register controls the headphone volume controls for both stereo channels and mute bit. Each volume subregister contains five bits, generating 32 volume levels with 31 steps of 1.5 dB each. Because AC ’97 defines 6-bit volume registers, to maintain compatibility, whenever the D5 or D13 bits are set to 1, their respective lower five volume bits are automati- cally set to 1 by the codec logic. On readback, all lower five bits will read 1s whenever these bits are set to 1. RHV [4:0] Right Headphone Volume Control. The least significant bit represents 1.5 dB. This register controls the output from 0 dB to a maximum attenuation of 46.5 dB. RM Right Channel Mute. Once enabled by the MSPLT bit in Register 76h, this bit mutes the right channel separately from the HPM bit. Otherwise, this bit will always read 0 and will have no effect when set to 1. LHV [4:0] Left Headphone Volume Control. The least significant bit represents 1.5 dB. This register controls the output from 0 dB to a maximum attenuation of 46.5 dB. HPM Headphones Volume Mute. When this bit is set to 1, both the left and right channels are muted, unless the MSPLT bit in Register 76h is set to 1, in which case this mute bit will affect only the left channel. Table I. Volume Settings for Master and Headphone Control Bits Reg. 76h Master Volume (02h) and Headphone Volume (04h) MSPLT * Left Channel Volume D[13:8] Right Channel Volume D[5:0] D15 Write Readback Function D7 * Write Readback Function 00 00 0000 00 0000 0 dB Gain x 00 0000 00 0000 0 dB Gain 00 00 1111 00 1111 –22.5 dB Gain x 00 1111 00 1111 –22.5 dB Gain 00 01 1111 01 1111 –46.5 dB Gain x 01 1111 01 1111 –46.5 dB Gain 00 1x xxxx 01 1111 –46.5 dB Gain x 1x xxxx 01 1111 –46.5 dB Gain 01 xx xxxx xx xxxx – dB Gain, Muted x xx xxxx xx xxxx – dB Gain, Muted 10 1x xxxx 01 1111 –46.5 dB Gain 1 xx xxxx xx xxxx – dB Gain, Right Only Muted 11 xx xxxx xx xxxx – dB Gain, Left Only Muted 0 xx xxxx xx xxxx –46.5 dB Gain 11 xx xxxx xx xxxx – dB Gain, Left Muted 1 xx xxxx xx xxxx – dB Gain, Right Muted *For AC ’97 compatibility, Bit D7 (RM) is available only by setting the MSPLT bit, Register 76h. The MSPLT bit enables separate mute bits for the left and right channels. If MSPLT is not set, RM bit has no effect. x in the above table is a wild card and has no effect on the value. Reg No. Name D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Default 04h Headphone HPM X X LHV LHV LHV LHV LHV RM * XXRHV RHV RHV RHV RHV 8000h Volume 4 3 2 1 0 4 3 2 1 0 |
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