Texas Instruments DAC3482 - Manual (Page 5)

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2.2.2 Digital Block Options
Figure 4. Digital Block Options
● Interpolation: allows control of the data rate versus DAC sampling rate ratio (i.e. data rate ×
interpolation = DAC sampling rate).
● Digital Mixer: allows control of the coarse mixer function.
Note: If fine mixer (NCO) is used, the “Enable Mixer” button must be checked, and the coarse
mixer must be bypassed. See NCO section for detail.
● Inverse sinx/x filter: allows compensation of the sinx/x attenuation of the DAC output.
Note: If inverse sinx/x filter is used, the input data digital full-scale must be backed off accordingly
to avoid digital saturation.
● Clock Receiver Sleep: allows the DAC clock receiver to be in sleep mode. The DAC has minimum
power consumption in this mode.
● Clock Divider Sync: allows the syncing of the internal divided-down clocks using either Frame,
Sync, or OSTR signal. Enable the divider sync as part of the initialization procedure or
resynchronization procedure.
● Group Delay: allows adjustment of group delay for each I/Q channel. This is useful for wideband
sideband suppression.
● Offset Adjustment: allows adjustment of DC offset to minimize the LO feed-through of the modulator
output. This section requires sync for proper operation. The sync options are listed below:
O REGWR: auto-sync from SIF register write.
O OSTR: sync from the external LVPECL OSTR signal. Clock divider sync must be enabled with
OSTR set as sync source
O SYNC: sync from the external LVDS SYNC signal.
O SIF SYNC: sync from SIF Sync. Uncheck and check the SIF Sync button for sync event.
● QMC Adjustment: allows adjustment of the gain and phase of the I/Q channel to minimize sideband
power of the modulator output.
O REGWR: auto-sync from SIF register write.
O OSTR: sync from the external LVPECL OSTR signal. Clock divider sync must be enabled with
OSTR set as sync source
O SYNC: sync from the external LVDS SYNC signal.
O SIF SYNC: sync from SIF Sync. Uncheck and check the SIF Sync button for sync event.
5 SLAU336 – March 2011 DAC3484/DAC3482 EVM
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