TAS3103DBT datasheet(96/146 Pages) TI

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3−36

SAP

Input

Port

Resolution

48-Bit

DAP

Word

Headroom

48-Bit

DAP

Word

DRC

Channel 1

Processing

Resolution

Headroom

Channel 2

Processing

0-dB Gain

Figure 3−22. DRC Input Word Structure for 0-dB Channel Processing Gain

The resulting DRC transfer function for the above parameters is shown in Figure 3−23. The threshold T2 is set at the

DRC rms input level of −50 dB, which corresponds to a −26-dB rms signal level at the SAP input. The

DRC-compensated output at T2 is cut 30 dB with respect to the 1:1 transfer function (O2 = 30 dB). The threshold T1

is set at the DRC rms input level of −125 dB, which corresponds to a −101-dB rms signal level at the SAP input. The

DRC-compensated output at T1 is boosted by 7.5 dB with respect to the 1:1 transfer function (O1 = −7.5 dB).

For thresholds, TdB = -6.0206TINPUT = -6.0206TSUB_ADDRESS_ENTRY.

Therefore,

T2 = −26 dB −24 dB = −50 dB

≥ T2INPUT

= −50/−6.0206 = 8.30482

= 01000.0100_1110_0000_1000_1010_111

= 0x000004270457 in 25.23 format

T1 = −101 dB −24 dB = −125 dB

≥ T1INPUT = −125/−6.0206 = 20.76205

= 010100.1100_0011_0001_0101_1011_010

= 0x00000A618ADA in 25/23 format

For offsets, O

INPUT +

6.0206

dB )

24.0824 .

Therefore, O2

INPUT +

6.0206

[30

) 24.0824] + 8.982892

+ 01000.1111_1011_1001_1110_1100_111

+ 0x0000047DCF67 in 25.23 format

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