CS3318 Datasheet, PDF (20/44 Pages) Cirrus Logic – 8-Channel Analog Volume Control

CS3318
Table 1 shows example volume settings using individual and master volume controls.
Individual_ChX Master 1
Channel 1 +3.75 dB
Channel 2 +2.5 dB
Channel 3 +1.25 dB
Channel 4
Channel 5
0 dB
-1.25 dB
+1.0 dB
Channel 6 -2.5 dB
Channel 7 -3.75 dB
Channel 8 -4.0 dB
Mask 1_ChX
0
0
0
0
1
1
1
1
Master 2
+5.25 dB
Mask 2_ChX
0
0
1
1
0
0
1
1
Master 3
-8.5 dB
Mask 3_ChX
0
1
0
1
0
1
0
1
Level_ChX
+3.75 dB
-6.0 dB
+6.5 dB
-3.25 dB
-0.25 dB
-10.0 dB
+2.5 dB
-6.25 dB
Table 1. Example Volume Settings
Refer to Figure 6 on page 18 for a graphical representation of the volume controls’ functionality.
Referenced Control
Register Location
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
5.5.3
Volume Limits
The analog section of the CS3318 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 CS3318’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 CS3318’s analog section. This architecture has
the benefit of allowing both individual and master volume control input beyond the analog range of the
CS3318.
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.
Referenced Control
Register Location
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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