CS3308 datasheet(20/44 Pages) CIRRUS

20 / 44 page

DS702F1

CS3308

Table 1 shows example volume settings using individual and master volume controls.

Refer to Figure 6 on page 18 for a graphical representation of the volume controls’ functionality.

5.5.3

Volume Limits

The analog section of the CS3308 is designed to accommodate gain and attenuation over the range of

+22 dB to -96 dB. Values outside this range may, however, be written to the CS3308’s internal registers.

As shown in Figure 6 on page 18, the value of the Individual and Master volume control registers are

summed before being limited to the range allowed by the CS3308’s analog section. This architecture has

the benefit of allowing both individual and master volume control input beyond the analog range of the

CS3308.

If the effective volume (See Equation 1 on page 19) of an individual channel is greater than +22 dB, the

channel’s volume will be set to +22 dB.

If the effective volume of an individual channel is less than -96 dB, the channel will mute, but the MuteChX

bit will not be set. When the channel’s effective volume returns to -96 dB or above, the mute condition will

be released. It should be noted that if the channel’s MuteChX bit or any of the channel’s unmasked

Master X Mute bits are set, the channel will remain muted until the necessary mute conditions are re-

leased.

IndividualChX Master 1

Mask 1ChX

Master 2

Mask 2ChX

Master 3

Mask 3ChX

LevelChX

Channel 1

+3.75 dB

+1.0 dB

+5.25 dB

-8.5 dB

+3.75 dB

Channel 2

+2.5 dB

-6.0 dB

Channel 3

+1.25 dB

+6.5 dB

Channel 4

0 dB

-3.25 dB

Channel 5

-1.25 dB

-0.25 dB

Channel 6

-2.5 dB

-10.0 dB

Channel 7

-3.75 dB

+2.5 dB

Channel 8

-4.0 dB

-6.25 dB

Table 1. Example Volume Settings

Referenced Control

Master X Volume................. “Master 1 Volume - Address 11h” on page 36

“Master 2 Volume - Address 14h” on page 37

“Master 3 Volume - Address 17h” on page 38

Master X Control ................. “Master 1 Control - Address 12h” on page 37

“Master 2 Control - Address 15h” on page 38

“Master 3 Control - Address 18h” on page 39

Master X Mask .................... “Master 1 Mask - Address 10h” on page 36

“Master 2 Mask - Address 13h” on page 37

“Master 3 Mask - Address 16h” on page 38

Referenced Control

MuteChX ............................. “Mute Control - Address 0Ah” on page 33

Master X Mute..................... “Master 1 Mute (Bit 1)” on page 37

“Master 2 Mute (Bit 1)” on page 38

“Master 3 Mute (Bit 1)” on page 39

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