TAS3103DBT datasheet(83/146 Pages) TI

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3−23

Table 3−4. Volume Adjust Gain Coefficient (Continued)

GAIN (dB)

GAIN (FLOAT)

GAIN (COEFFICIENT)

GAIN (dB)

GAIN (GLOAT)

GAIN (COEFFICIENT)

−95

1.77828E−05

00000095

−122.5

7.49894E−07

00000006

−95.5

1.67880E−05

0000008C

−123

7.07946E−07

00000005

−96

1.58489E−05

00000084

−123.5

6.68344E−07

00000005

−96.5

1.49624E−06

0000007D

−124

6.30958E−07

00000005

−97

1.41254E−05

00000076

−124.5

5.95662E−07

00000004

−97.5

1.33352E−05

0000006F

−125

5.62342E−07

00000004

−98

1.25893E−05

00000069

−125.5

5.30884E−07

00000004

−98.5

1.18850E−05

00000063

−126

5.01188E−07

00000004

−99

1.12202E−05

0000005E

−126.5

4.73152E−07

00000003

−99.5

1.05925E−05

00000058

−127

4.46684E−07

00000003

−100

0.00001

00000053

−127.5

4.21696E−07

00000003

−100.5

9.44060E−06

0000004F

−128

3.98108E−07

00000003

−114

1.99526E−06

00000010

−128.5

3.75838E−07

00000003

−114.5

1.88365E−06

0000000F

−129

3.54814E−07

00000002

−115

1.77828E−06

0000000E

−129.5

3.34966E−07

00000002

−115.5

1.67880E−06

0000000E

−130

3.16228E−07

00000002

−116

1.58489E−06

0000000D

−130.5

2.98538E−07

00000002

−116.5

1.49624E−06

0000000C

−131

2.81838E−07

00000002

−117

1.41254E−06

0000000B

−131.5

2.66072E−07

00000002

−117.5

1.33352E−06

0000000B

−132

2.51188E−07

00000002

−118

1.25893E−06

0000000A

−132.5

2.37138E−07

00000001

−118.5

1.18850E−06

00000009

−133

2.23872E−07

00000001

−119

1.12202E−06

00000009

−133.5

2.11348E−07

00000001

−119.5

1.05925E−06

00000008

−134

1.99526E−07

00000001

−120

0.000001

00000008

−134.5

1.88365E−07

00000001

−120.5

9.44080E−07

00000007

−135

1.77828E−07

00000001

−121

8.91250E−07

00000007

−135.5

1.67880E−07

00000001

−121.5

8.41396E−07

00000007

−136

1.58489E−07

00000001

−122

7.94328E−07

00000006

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 illegal 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 I2C Read Transactions

I2C 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

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