B15
R/W
B14
B13
B12
B11
B10
B9
B8
B7
B6
B5
B4
B3
B2
B1
B0
REGISTER 9
IDX6
IDX5
IDX4
IDX3
IDX2
IDX1
IDX0
res
res
FLT0 CLKD CLKE FMT2 FMT1 FMT0
R/W
Read/Write Mode Select
When R/W = 0, a Write operation is performed.
When R/W = 1, a Read operation is performed.
Default Value: 0
FLT0
Digital Filter Roll-Off Control
These bits are Read/Write.
Default Value: 000B
FLT0 = 0
FLT0 = 1
Sharp Roll-Off (default)
Slow Roll-Off
Bit FLT0 allows the user to select the digital filter roll-off that is best suited to their application. Two filter roll-
off sections are available: Sharp or Slow. The filter responses for these selections are shown in the Typical
Performance Curves section of this data sheet.
CLKD
SCLKO Frequency Selection
This bit is Read/Write.
Default Value: 0
CLKD = 0
CLKD = 1
Full Rate, fSCLKO = fSCLKI (default)
Half Rate, fSCLKO = fSCLKL/2
The CLKD bit is used to determine the clock frequency at the system clock output pin, SCLKO.
CLKE
SCLKO Output Enable
This bit is Read/Write.
Default Value: 0
CLKE = 0
CLKE = 1
SCLKO Enabled (default)
SCLKO Disabled
The CLKE bit is used to enable or disable the system clock output pin, SCLKO. When SCLKO is enabled, it
will output either a full or half rate clock, based upon the setting of the CLKD bit. When SCLKO is disabled,
it is set to a high impedance state.
FMT[2:0] Audio Interface Data Format
These bits are Read/Write.
Default Value: 000B
FMT[2:0]
Audio Data Format Selection
000
001
010
011
100
101
110
111
24-Bit Standard Format, Right-Justified Data (default)
20-Bit Standard Format, Right-Justified Data
18-Bit Standard Format, Right-Justified Data
16-Bit Standard Format, Right-Justified Data
I2S Format, 16- to 24-bits
Left-Justified Format, 16- to 24-Bits
Reserved
Reserved
The FMT[2:0] bits are used to select the data format for the serial audio interface.
19
®
PCM1600, PCM1601
BB [ BURR-BROWN CORPORATION ]
