參數(shù)資料
型號(hào)： AD1981BJST-REEL
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 6/32頁(yè)
文件大?。?/td> 0K
描述： IC CODEC STEREO MICPREAMP 48LQFP
標(biāo)準(zhǔn)包裝： 1
系列： SoundMAX®
類型： 音頻編解碼器 '97
數(shù)據(jù)接口： 串行
分辨率（位）： 16，20 b
ADC / DAC 數(shù)量： 4 / 2
三角積分調(diào)變： 無(wú)
動(dòng)態(tài)范圍，標(biāo)準(zhǔn) ADC / DAC (db)： 85 / 90
電壓 - 電源，模擬： 4.5 V ~ 5.5 V
電壓 - 電源，數(shù)字： 3 V ~ 3.47 V
工作溫度： 0°C ~ 70°C
安裝類型： 表面貼裝
封裝/外殼： 48-LQFP
供應(yīng)商設(shè)備封裝： 48-LQFP（7x7）
包裝： 標(biāo)準(zhǔn)包裝
其它名稱： AD1981BJSTREELDKR
AD1981B
Rev. C | Page 14 of 32
HEADPHONE VOLUME REGISTER
Index 0x04
This register controls the headphone volume controls for both stereo channels and the 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 automatically set to 1 by the codec logic. On readback,
all lower five bits read 1s whenever these bits are set to 1. Refer to Table 12 for examples.
Reg
No.
Name
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
Default
0x04
Headphone
Volume
HPM
X
LHV4
LHV3
LHV2
LHV1
LHV0
X
RHV4
RHV3
RHV2
RHV1
RHV0
0x8000
1 For AC ’97 compatibility, Bit D7 (RM) is available only by setting the MSPLT bit, Register 0x76. The MSPLT bit enables separate mute bits for the left and right channels.
If MSPLT is not set, the RM bit has no effect. All registers are not shown, and bits containing an X are assumed to be reserved.
Table 11.
Bit
Mnemonic
Function
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 0x76, this bit mutes the right channel separately from the
HPM bit. Otherwise, this bit always reads 0 and has 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
Headphone Volume
Mute
When this bit is set to 1, both the left and right channels are muted, unless the MSPLT bit in
Register 0x76 is set to 1, in which case this mute bit affects only the left channel.
Table 12. Volume Settings for Master and Headphone
Reg. 0x76
Control Bits Master Volume (0x02) and Headphone Volume (0x04)
Left-Channel Volume D [13:8]
Right-Channel Volume D [5:0]
MSPLT1
D15
Write
Readback
Function
D71
Write
Readback
Function
0
00 0000
0 dB Gain
X
00 0000
0 dB Gain
0
00 1111
22.5 dB Gain
X
00 1111
22.5 dB Gain
0
01 1111
46.5 dB Gain
X
01 1111
46.5 dB Gain
0
1X XXXX
01 1111
46.5 dB Gain
X
1X XXXX
01 1111
46.5 dB Gain
0
1
XX XXXX
∞ dB Gain, Muted
X
XX XXXX
∞ dB Gain, Muted
1
0
1X XXXX
01 1111
46.5 dB Gain
1
XX XXXX
∞ dB Gain, Right Only Muted
1
XX XXXX
∞ dB Gain, Left Only Muted
0
XX XXXX
46.5 dB Gain
1
XX XXXX
∞ dB Gain, Left Muted
1
XX XXXX
∞ dB Gain, Right Muted
1 For AC ’97 compatibility, Bit D7 (RM) is available only by setting the MSPLT bit, Register 0x76. The MSPLT bit enables separate mute bits for the left and right channels.
If MSPLT is not set, the RM bit has no effect.
X is a wild card and has no effect on the value.
OBSOLETE
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AD1981BJSTZ 制造商:Analog Devices 功能描述:IC AUDIO CODEC
AD1981BJSTZ1 制造商:AD 制造商全稱:Analog Devices 功能描述:AC 97 SoundMAX Codec
AD1981BJSTZ2 制造商:AD 制造商全稱:Analog Devices 功能描述:AC ’97 SoundMAX Codec
AD1981BJSTZ-REEL 制造商:Analog Devices 功能描述:Audio Codec 4ADC / 2DAC 20-Bit 48-Pin LQFP T/R 制造商:Rochester Electronics LLC 功能描述:AC'97 SOUNDMAX CODEC W/STEREO MIC PREAMP - Tape and Reel 制造商:Analog Devices 功能描述:IC AUDIO CODEC
AD1981BJSTZ-REEL2 制造商:AD 制造商全稱:Analog Devices 功能描述:AC ’97 SoundMAX Codec
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