Datasheet
FLT: Digital Filter Roll-Off Control
FMT[2:0]: Audio Interface Data Format
SRST: Reset
ZREV: Zero-Flag Polarity Select
PCM1680
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.................................................................................................................................................. SLES133B – MARCH 2005 – REVISED OCTOBER 2008
B15 B14 B13 B12 B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0
REGISTER 9 0 IDX6 IDX5 IDX4 IDX3 IDX2 IDX1 IDX0 RSV RSV FLT RSV RSV FMT2 FMT1 FMT0
Default value: 0
FLT = 0 Sharp roll-off (default)
FLT = 1 Slow roll-off
The FLT bit allows users to select the digital filter roll-off that is best suited to their application. Two filter roll-off
selections are available: sharp or slow. The filter responses for these selections are shown in the Typical
Characteristics section of this data sheet.
Default value: 101b
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-bit
101 Left-justified format, 16- to 24-bit (default)
110 Reserved
111 Reserved
The FMT[2:0] bits are used to select the data format for the serial audio interface.
B15 B14 B13 B12 B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0
REGISTER 10 0 IDX6 IDX5 IDX4 IDX3 IDX2 IDX1 IDX0 SRST ZREV DREV DMF1 DMF0 RSV RSV DMC
Default value: 0
SRST = 0 Reset disabled (default)
SRST = 1 Reset enabled
The SRST bit is used to enable or disable the soft reset function. The operation is the same as the
power-on-reset function with the exception of the reset period, which is 1024 system clocks for the SRST
function. All registers are initialized.
Default value: 0
ZREV = 0 Zero-flag pins high at a zero detect (default)
ZREV = 1 Zero-flag pins low at a zero detect
The ZREV bit allows the user to select the polarity of the zero-flag pins.
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