National Semiconductor LM4681, Руководство пользователя

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Appendix B Volume Control Settings Binary Values
The minimum volume setting is set to –64.94 (H.P. output) or –48.03 (Class D output) 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.
Table B1. Binary Values for the Different Volume Control Gain Settings
Gain (dB)
Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
HP Outputs Class D
Outputs
–64.94 –48.03 0 0 0 0 0
–64.94 –48.03 0 0 0 0 1
–56.94 –36.03 0 0 0 1 0
–47.94 –31.03 0 0 0 1 1
–42.94 –26.03 0 0 1 0 0
–37.94 –21.03 0 0 1 0 1
–33.94 –17.03 0 0 1 1 0
–31.94 –15.03 0 0 1 1 1
–28.94 –12.03 0 1 0 0 0
–25.94 –9.03 0 1 0 0 1
–22.94 –6.03 0 1 0 1 0
–20.94 –4.03 0 1 0 1 1
–18.94 –2.03 0 1 1 0 0
–16.94 –0.03 0 1 1 0 1
–14.94 1.97 0 1 1 1 0
–12.94 3.97 0 1 1 1 1
–10.94 5.97 1 0 0 0 0
–8.94 7.97 1 0 0 0 1
–6.94 9.97 1 0 0 1 0
–4.94 11.97 1 0 0 1 1
–2.94 13.97 1 0 1 0 0
–0.94 15.97 1 0 1 0 1
1.06 17.97 1 0 1 1 0
3.06 19.97 1 0 1 1 1
6.06 22.97 1 1 0 0 0
7.07 23.97 1 1 0 0 1
8.06 24.97 1 1 0 1 0
9.06 25.97 1 1 0 1 1
10.06 26.97 1 1 1 0 0
11.06 27.97 1 1 1 0 1
12.06 28.97 1 1 1 1 0
13.06 29.97 1 1 1 1 1
Appendix C LLP Package, PCB, Layout, and Mounting Considerations
Refer to Application Notes (AN-1187) for more information on Leadless Leadframe Package (LLP).
Since National Semiconductor is constantly pursuing the best package performance possible, please refer to the following web
page for possible updates to the LLP package information presented in Appendix C:
<
http://www.national.com/an/AN/AN-
1187.pdf
>
.
AN-1488
www.national.com 12