Datasheet

PCM1690
SBAS448A – OCTOBER 2008 – REVISED JANUARY 2009 .............................................................................................................................................. www.ti.com
DEC HEX B7 B6 B5 B4 B3 B2 B1 B0
66 42 OPEDA3 OPEDA2 OPEDA1 OPEDA0 FLT3 FLT2 FLT1 FLT0
OPEDA[3:0] Operation control
These bits control the DAC operation mode. In operation disable mode, the DAC output is cut off
from DIN and the internal DAC data are reset. If PSMDA = 1, the DAC output is forced into
VCOM. IF PSMDA = 0, the DAC output is forced into AGND and the DAC goes into a
power-down state. For normal operating mode, these bits must be '0'. The serial mode control is
effective during operation disable mode.
Default value: 0000.
OPEDA Operation control
xxx0 DAC1/2 normal operation
xxx1 DAC1/2 operation disable with or without power save
xx0x DAC3/4 normal operation
xx1x DAC3/4 operation disable with or without power save
x0xx DAC5/6 normal operation
x1xx DAC5/6 operation disable with or without power save
0xxx DAC7/8 normal operation
1xxx DAC7/8 operation disable with or without power save
FLT[3:0] Digital filter roll-off control
These bits allow users to select the digital filter roll-off that is best suited to their applications.
Sharp and slow filter roll-off selections are available. The filter responses for these selections are
shown in the Typical Characteristics section of this data sheet.
Default value: 0000.
FLT Digital filter roll-off control
xxx0 DAC1/2 sharp roll-off
xxx1 DAC1/2 slow roll-off
xx0x DAC3/4 sharp roll-off
xx1x DAC3/4 slow roll-off
x0xx DAC5/6 sharp roll-off
x1xx DAC5/6 slow roll-off
0xxx DAC7/8 sharp roll-off
1xxx DAC7/8 slow roll-off
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