CS3318 Datasheet, PDF (32/44 Pages) Cirrus Logic – 8-Channel Analog Volume Control

7.2 ¼ dB Control - Address 09h
7
Quarter8
6
Quarter7
5
Quarter6
4
Quarter5
3
Quarter4
2
Quarter3
CS3318
1
Quarter2
0
Quarter1
7.2.1
¼ dB Control (Bit 0 - 7)
Default = 0
Function:
When set, ¼ dB of gain will be added to each bit’s respective channel. The volume changes are im-
plemented as dictated by the ZCMode[1:0] and TimeOut[2:0] bits in the Device Config 2 register (see
“Device Configuration 2 - Address 0Ch” on page 34).
It should be noted that input values outside the CS3318’s analog range of +22 dB to -96 dB are valid;
however, the volume of each channel will be limited to the CS3318’s analog range (see “Volume Lim-
its” on page 20).
Table 6 shows example volume settings using the ¼ dB control.
Volume Control Register
Setting (Reg 01h - 08h)
11111110
11111101
11111101
11111100
11111100
-
11010100
11010011
11010011
11010010
11010010
11010001
11010001
11010000
11010000
-
00010100
00010011
00010011
00010010
00010010
Corresponding QuarterX
Bit Setting
0
1
0
1
0
-
0
1
0
1
0
1
0
1
0
-
0
1
0
1
0
Individual Volume_ChX (dB)
+22
+21.75
+21.5
+21.25
+21
-
+1
+0.75
+0.5
+0.25
0
-0.25
-0.5
-0.75
-1
-
-95
-95.25
-95.5
-95.75
-96
Table 6. Example Volume Settings
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