lm4985tmx National Semiconductor Corporation, lm4985tmx Datasheet - Page 27

• Manufacturer Part Number: lm4985tmx
• Description: Stereo 135mw Low Noise Headphone Amplifier With Selectable Capacitively Coupled Or Output Capacitor-less Ocl Output And Digitally Controlled I2c V
• Manufacturer: National Semiconductor Corporation

Volume Control Settings Binary Values
The minimum volume setting is set to –76dB when 00000 is loaded into the volume control register. Incrementing the volume
control register in binary fashion increases the volume control setting, reaching full scale at 11111. Table C1 shows the value of
the gain for each of the 32 binary volume control settings.
Gain
–10
–12
–14
–16
–18
–21
–24
–27
–30
–34
–38
–44
–52
–62
–76
–2
–4
–6
–8
18
17
16
15
14
13
12
10
8
6
4
2
0
Table C1. Binary Values for the Different Volume Control Gain Settings
B4
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
B3
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
27
B2
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
B1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
B0
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1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0