Datasheet

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PCM1780 , PCM1781 , PCM1782
SLES132B – MARCH 2005 – REVISED AUGUST 2006
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
NOTE: RSV indicates a reserved bit that should be set to 0.
FMT[2:0]: Audio Interface Data Format
Default value: 101
FMT[2:0] Audio Data Format Selection
000 24-bit right-justified format, standard data
001 20-bit right-justified format, standard data
010 18-bit right-justified format, standard data
011 16-bit right-justified format, standard data
100 I
2
S format, 16 to 24 bits
101 Left-justified format, 16 to 24 bits (default)
110 Reserved
111 Reserved
The FMT[2:0] bits are used to select the data format for the serial audio interface. The preceding table shows
the available format options.
FLT: Digital Filter Rolloff Control
Default value: 0
FLT = 0 Sharp rolloff (default)
FLT = 1 Slow rolloff
The FLT bit allows users to select the digital filter rolloff that is best suited to their application. Two filter rolloff
selections are available: sharp and slow. The filter responses for these selections are shown in the Typical
Performance Curves section of this data sheet
B15 B14 B13 B12 B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0
REGISTER 21 0 IDX6 IDX5 IDX4 IDX3 IDX2 IDX1 IDX0 RSV RSV RSV RSV RSV RSV RSV DAMS
NOTE: RSV indicates a reserved bit that should be set to 0.
DAMS: Digital Attenuation Mode Select
Default value: 0
DAMS = 0 Fine step, 0.5 dB/step for 0 to –63 dB range (default)
DAMS = 1 Wide range, 1 dB/step for 0 to –100 dB range
The DAMS bit is used to select the digital attenuation mode.
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