參數(shù)資料
型號(hào): AD1981BJST-REEL
廠商: Analog Devices Inc
文件頁(yè)數(shù): 13/32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(lèi)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(lèi)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(chēng): AD1981BJSTREELDKR
AD1981B
Rev. C | Page 20 of 32
Table 26. Settings for Record Gain Register
Reg. 0x76
Control Bits Record Gain (1Channel)
Left-Channel Input Mixer D [11:8]
Right-Channel Input Mixer D [3:0]
MSPLT1
D15
Write
Readback
Function
D71
Write
Readback
Function
0
1111
22.5 dB Gain
X
1111
22.5 dB Gain
0
0000
0 dB Gain
X
0000
0 dB Gain
0
1
XXXX
∞ dB Gain,
Muted
X
XXXX
∞ dB Gain,
Muted
1
0
1111
22.5 dB Gain
1
XXXX
∞ dB Gain,
Right Only
Muted
1
XXXX
∞ dB Gain,
Left Only
Muted
0
1111
22.5 dB Gain
1
XXXX
∞ dB Gain,
Left Muted
1
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.
GENERAL-PURPOSE REGISTER
Index 0x20
Reg No.
Name
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
Default
0x20
General-Purpose
X
MIX
MS
LPBK
X
0x0000
This register should be read before writing to generate a mask for only the bit(s) that need to be changed.
All registers are not shown, and bits containing an X are assumed to be reserved.
Table 27.
Bit
Mnemonic
Function
LPBK
Loopback Control
ADC/DAC Digital Loopback Mode.
0 = No Loopback (default).
1 = Loopback PCM Digital Data from ADC Output to DAC.
MS
MIC Select
Selects mono MIC input.
0 = Select MIC1.
1 = Select MIC2.
See the 2CMIC bit in Register 0x76 to enable stereo microphone recording.
MIX
Mono Output Select
Selects mono output audio source.
0 = Mixer Mono Output (reset default).
1 = MIC1 Channel.
OBSOLETE
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