CS3318 Datasheet, PDF (39/44 Pages) Cirrus Logic – 8-Channel Analog Volume Control

CS3318
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).
The value of the Master 3 volume control register is mapped to the desired 0.5 dB step Master 3 vol-
ume setting by the following equation:
Register Value = (2 × Desired Volume Setting in dB) + 210
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 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).
See Table 5 on page 31 for example register settings.
7.17 Master 3 Control - Address 18h
7
Reserved
6
Reserved
5
Reserved
4
Reserved
3
Reserved
2
Reserved
1
M3_Mute
0
M3_Qtr
7.17.1 Master 3 Mute (Bit 1)
Default = 0
Function:
This bit controls the Master 3 mute state. When set, the Master 3 mute condition is active. When
cleared, the Master 3 mute condition is released.
See “Muting Controls” on page 21 for more information about the muting behavior of the CS3318.
7.17.2 Master 3 ¼ dB Control (Bit 0)
Default = 0
Function:
When set, ¼ dB of gain will be added to the Master 3 volume level.
See Table 6 on page 32 for an example of volume settings using the ¼ dB control.
DS693F1
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