Cirrus Logic CS3308 - Manual (Page 38)

38 DS702F1
CS3308
In the equation above, “Desired Volume Setting in dB” is determined by rounding the desired ¼ dB
resolution volume setting down to ½ dB resolution.
It should be noted that input values outside the CS3308’s analog range of +22 dB to -96 dB are valid;
however, the volume of each channel will be limited to the CS3308’s analog range (see
“Volume Lim-
its” on page 20 ).
See Table 5 on page 31 for example register settings.
7.14 Master 2 Control - Address 15h
7.14.1 Master 2 Mute (Bit 1)
Default = 0
Function:
This bit controls the Master 2 mute state. When set, the Master 1 mute condition is active. When
cleared, the Master 2 mute condition is released.
See “Muting Controls” on page 21 for more information about the muting behavior of the CS3308.
7.14.2 Master 2 ¼ dB Control (Bit 0)
Default = 0
Function:
When set, ¼ dB of gain will be added to the Master 2 volume level.
See Table 6 on page 32 for an example of volume settings using the ¼ dB control.
7.15 Master 3 Mask - Address 16h
Each bit in this register serves as a Master 3 mask for its corresponding channel.
If a mask bit is set to ‘1’, the corresponding channel is unmasked, meaning that it will be affected by the
Master 3 volume and muting controls.
If a mask bit is set to ‘0’, the corresponding channel is masked, meaning that it will not be affected by the
Master 3 volume and muting controls.
This register defaults to FFh (all channels unmasked).
7.16 Master 3 Volume - Address 17h
7.16.1 Master 3 Volume Control (Bits 7:0)
Default = 11010010
Function:
The Master 3 volume control register allows the user to simultaneously gain or attenuate all un-
masked channels from +22 dB to -96 dB in 0.5 dB increments. The volume changes are implemented
7 6 5 4 3 2 1 0
Reserved Reserved Reserved Reserved Reserved Reserved M2_Mute M2_Qtr
7 6 5 4 3 2 1 0
M3_Ch8M M3_Ch7M M3_Ch6M M3_Ch5M M3_Ch4M M3_Ch3M M3_Ch2M M3_Ch1M
7 6 5 4 3 2 1 0
M3_Vol7 M3_Vol6 M3_Vol5 M3_Vol4 M3_Vol3 M3_Vol2 M3_Vol1 M3_Vol0