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AD1888JSTZ bảng dữ liệu(PDF) 11 Page - Analog Devices |
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AD1888JSTZ bảng dữ liệu(HTML) 11 Page - Analog Devices |
11 / 32 page REV. 0 AD1888 –11– Table I. Volume Settings for Master and Headphone Control Bits Reg. 76h Master Volume (02h) and Headphone Volume (04h) Left Channel Volume D[13:8] Right Channel Volume D[5:0] MSPLT * 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, only Right 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 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, Bit D7 has no effect. x in the above table is “don’t care.” Mono Volume Register (Index 06h) Reg No. Name D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 * D4 D3 D2 D1 D0 Default 06h Mono Volume MVM X X X X X X X X X MV5 MV4 MV3 MV2 MV1 MV0 8000h *Refer to Table II for examples. This register controls the Mono output volume and mute bit. The volume register 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 bit is set to 1, their respective lower five volume bits are automatically set to 1 by the codec logic. On readback, all lower five bits will read 1s whenever this bit is set to 1. All registers not shown and bits containing an X are assumed to be reserved. MV[5:0] Mono 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. MVM Mono Volume Mute. When this bit is set to 1, the channel is muted. Table II. Volume Settings for Mono Control Bits D[4:0] for Mono (06h) D15 WRITE READBACK Function 00 0000 0 0000 0 dB Gain 00 1111 0 1111 –22.5 dB Gain 01 1111 1 1111 –46.5 dB Gain 1x xxxx x xxxx – dB Gain, Muted x in the above table is a wild card and has no effect on the value. Headphones Volume Register (Index 04h) Reg No. Name D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Default 04h Headphones HPM X LHV5 LHV4 LHV3 LHV2 LHV1 LHV0 HPRM * X RHV5 RHV4 RHV3 RHV2 RHV1 RHV0 8000h Volume *For AC ’97 compatibility, Bit D7 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, Bit D7 has no effect. |
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