Datasheet

3−24
Table 3−4. Volume Adjust Gain Coefficient (Continued)
GAIN (dB) GAIN (FLOAT) GAIN (COEFFICIENT) GAIN (dB) GAIN (FLOAT) GAIN (COEFFICIENT)
−108 3.98108E−06 0000 0021 −122.5 7.49894E−07 0000 0006
−108.5 3.75838E−06 0000 001F −123 7.07946E−07 0000 0005
−109 3.54814E−06 0000 001D −123.5 6.68344E−07 0000 0005
−109.5 3.34966E−06 0000 001C −124 6.30958E−07 0000 0005
−110 3.16228E−06 0000 001A −124.5 5.95662E−07 0000 0004
−110.5 2.98538E−06 0000 0019 −125 5.62342E−07 0000 0004
−111 2.81838E−06 0000 0017 −125.5 5.30884E−07 0000 0004
−111.5 2.66072E−06 0000 0016 −126 5.01188E−07 0000 0004
−112 2.51188E−06 0000 0015 −126.5 4.73152E−07 0000 0003
−112.5 2.37138E−06 0000 0013 −127 4.46684E−07 0000 0003
−113 2.23872E−06 0000 0012 −127.5 4.21696E−07 0000 0003
−113.5 2.11348E−06 0000 0011 −128 3.98108E−07 0000 0003
−114 1.99526E−06 0000 0010 −128.5 3.75838E−07 0000 0003
−114.5 1.88365E−06 0000 000F −129 3.54814E−07 0000 0002
−115 1.77828E−06 0000 000E −129.5 3.34966E−07 0000 0002
−115.5 1.67880E−06 0000 000E −130 3.16228E−07 0000 0002
−116 1.58489E−06 0000 000D −130.5 2.98538E−07 0000 0002
−116.5 1.49624E−06 0000 000C −131 2.81838E−07 0000 0002
−117 1.41254E−06 0000 000B −131.5 2.66072E−07 0000 0002
−117.5 1.33352E−06 0000 000B −132 2.51188E−07 0000 0002
−118 1.25893E−06 0000 000A −132.5 2.37138E−07 0000 0001
−118.5 1.18850E−06 0000 0009 −133 2.23872E−07 0000 0001
−119 1.12202E−06 0000 0009 −133.5 2.11348E−07 0000 0001
−119.5 1.05925E−06 0000 0008 −134 1.99526E−07 0000 0001
−120 0.000001 0000 0008 −134.5 1.88365E−07 0000 0001
−120.5 9.44080E−07 0000 0007 −135 1.77828E−07 0000 0001
−121 8.91250E−07 0000 0007 −135.5 1.67880E−07 0000 0001
−121.5 8.41396E−07 0000 0007 −136 1.58489E−07 0000 0001
−122 7.94328E−07 0000 0006
3.6.1.1 Soft Volume Adjustment Range Limitations
When the 2048 sample transition time is selected for the S-curve volume transition, the full −∞ to 24-dB adjustment
range is available. All possible values but one in the signed 28-bit (5.23-format) volume-level command range are
valid volume-level selections. The one exception is the maximum negative volume-level command 0x08000000. This
value is reserved and if used, could result in erratic behavior that requires a reset to the part to correct.
When the 4096-sample transition time is selected, the upper two bits of the 28-bit volume command cannot be used.
This means that the valid volume-level command range is reduced to a maximum positive value of 0x1FFFFFF
(12 dB) and a maximum negative value of 0x0E000000 (also 12 dB, but with a 180° phase inversion of the audio
signal). Values above these maximum levels could result in erratic behavior that requires a reset to the part to correct.
Although the volume boost for the 4096-sample transition time is limited to 12 dB, volume boost can be realized
elsewhere in the processing signal flow, such as in the input crossbar mixers, the biquad filters in the three monaural
channels, or the biquad filters in the effects block.
3.6.1.2 Soft Volume Transitions and Concurrent I
2
C Read Transactions
I
2
C read transactions at subaddresses 0x01 through 0xD1 are not allowed during volume-level transitions, as read
activity during volume-level transitions could result in erroneous data being output. If it is required to read subaddress