CS3318 datasheet(38/44 Pages) CIRRUS

38 / 44 page

DS693F1

CS3318

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.

7.14

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 CS3318.

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

543

Reserved

M2_Mute

M2_Qtr

543

M3_Ch8M

M3_Ch7M

M3_Ch6M

M3_Ch5M

M3_Ch4M

M3_Ch3M

M3_Ch2M

M3_Ch1M

543

M3_Vol7

M3_Vol6

M3_Vol5

M3_Vol4

M3_Vol3

M3_Vol2

M3_Vol1

M3_Vol0

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