TAS3103ADBT datasheet(100/154 Pages) TI2

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3−37

SAP

Input

Port

Resolution

48-Bit

DAP

Word

Headroom

48-Bit

DAP

Word

DRC

CH1

Processing

Resolution

Headroom

CH2

Processing

0-dB Gain

Figure 3−24. DRC Input Word Structure for 0-dB Channel Processing Gain

The resulting DRC transfer function for the above parameters is shown in Figure 3−25. 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

= 0 1000.0100 1110 0000 1000 1010 111

= 0x0000 0427 0457 in 25.23 format

T1 = −101 dB −24 dB = −125 dB

≥ T1INPUT = −125/−6.0206 = 20.76205

= 1 0100.1100 0011 0001 0101 1011 010

= 0x0000 0A61 8ADA in 25.23 format

For offsets, O

INPUT +

6.0206

dB )

24.0824 .

Therefore, O2

INPUT +

6.0206

[30

) 24.0824] + 8.982892

+ 0 1000.1111 1011 1001 1110 1100 111

+ 0x0000 047D CF67 in 25.23 format

TAS3103ADBT Datasheet(PDF) 100 Page - Texas Instruments

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