Datasheet

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FMT[2:0] – Audio Interface Data Format
FLT – Digital Filter Rolloff Control
PCM1742
SBAS176A – DECEMBER 2000 – REVISED APRIL 2005
B15 B14 B13 B12 B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0
REGISTER 20 0 IDX6 IDX5 IDX4 IDX3 IDX2 IDX1 IDX0 RSV RSV FLT RSV RSV FMT2 FMT1 FMT0
Default value: 101
The FMT[2:0] bits are used to select the data format for the serial audio interface. The following table shows the
available format options.
FMT[2:0] Audio Data Format Selection
000 24-bit standard format, right-justified data
001 20-bit standard format, right-justified data
010 18-bit standard format, right-justified data
011 16-bit standard format, right-justified data
100 I
2
S format, 16- to 24-bit
101 Left-justified format, 16- to 24-bit (default)
110 Reserved
111 Reserved
Default value: 0
FLT = 0 Sharp rolloff (default)
FLT = 1 Slow rolloff
The FLT bit allows the user to select the digital filter rolloff that is best suited to their application. Two filter rolloff
selections are available: sharp or slow. The filter responses for these selections are shown in the Typical
Performance Curves section of this data sheet.
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