Cirrus Logic CS3318 - Manual (Page 32)

32 DS693F1
CS3318
7.2 ¼ dB Control - Address 09h
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.
7 6 5 4 3 2 1 0
Quarter8 Quarter7 Quarter6 Quarter5 Quarter4 Quarter3 Quarter2 Quarter1
Volume Control Register
Setting (Reg 01h - 08h)
Corresponding QuarterX
Bit Setting Individual Volume
ChX
(dB)
11111110 0 +22
11111101 1 +21.75
11111101 0 +21.5
11111100 1 +21.25
11111100 0 +21
- - -
11010100 0 +1
11010011 1 +0.75
11010011 0 +0.5
11010010 1 +0.25
11010010 0 0
11010001 1 -0.25
11010001 0 -0.5
11010000 1 -0.75
11010000 0 -1
- - -
00010100 0 -95
00010011 1 -95.25
00010011 0 -95.5
00010010 1 -95.75
00010010 0 -96
Table 6. Example Volume Settings