CDB3308 Cirrus Logic Inc, CDB3308 Datasheet - Page 20

• Manufacturer Part Number: CDB3308
• Description: BOARD EVAL FOR CS3308 VOL CTRL
• Manufacturer: Cirrus Logic Inc

Specifications of CDB3308

• Main Purpose: Audio, Volume Control
• Embedded: No
• Utilized Ic / Part: CS3308
• Primary Attributes: 8 Single-Ended Analog Inputs and Outputs, USB or RS232 Interface
• Secondary Attributes: Graphic User Interface
• Description/function: Audio DSPs
• Operating Supply Voltage: 5 V
• Product: Audio Modules
• For Use With/related Products: CS3308
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Contains lead / RoHS non-compliant
• Other names: 598-1496

20
5.5.3
Table 1
Refer to
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
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
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.
Channel 1
Channel 2
Channel 3
Channel 4
Channel 5
Channel 6
Channel 7
Channel 8
Referenced Control
Master X Volume.................
Master X Control .................
Master X Mask ....................
Referenced Control
MuteChX .............................
Master X Mute.....................
shows example volume settings using individual and master volume controls.
Figure 6 on page 18
Individual
+3.75 dB
+1.25 dB
-1.25 dB
-3.75 dB
Figure 6 on page
+2.5 dB
-2.5 dB
-4.0 dB
0 dB
ChX
Register Location
Register Location
“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 1 Control - Address 12h” on page 37
“Master 2 Control - Address 15h” on page 38
“Master 3 Control - Address 18h” on page 39
“Master 1 Mask - Address 10h” on page 36
“Master 2 Mask - Address 13h” on page 37
“Master 3 Mask - Address 16h” on page 38
“Mute Control - Address 0Ah” on page 33
“Master 1 Mute (Bit 1)” on page 37
“Master 2 Mute (Bit 1)” on page 38
“Master 3 Mute (Bit 1)” on page 39
Master 1
+1.0 dB
Equation 1 on page
for a graphical representation of the volume controls’ functionality.
18, the value of the Individual and Master volume control registers are
Table 1. Example Volume Settings
Mask 1
0
0
0
0
1
1
1
1
ChX
Master 2
+5.25 dB
19) of an individual channel is greater than +22 dB, the
Mask 2
0
0
1
1
0
0
1
1
ChX
Master 3
-8.5 dB
Mask 3
0
1
0
1
0
1
0
1
ChX
CS3308
Level
+3.75 dB
DS702F1
-3.25 dB
-0.25 dB
-10.0 dB
-6.25 dB
+6.5 dB
+2.5 dB
-6.0 dB
ChX