Datasheet

Σ
B0164-03
I Data In
(C)
Q Data In
(D)
I Data Out
(C)
Q Data Out
(D)
11
11
12
16
16
16
16
qmc_gainC[10:0]
qmc_gainD[10:0]
qmc_phaseCD[11:0]
I Data In
(A)
Q Data In
(B)
I Data Out
(A)
Q Data Out
(B)
11
11
12
16
16
16
16
qmc_gainA[10:0]
qmc_gainB[10:0]
qmc_phaseAB[11:0]
Σ
DAC3484
www.ti.com SLAS749C –MARCH 2011–REVISED AUGUST 2012
Figure 77. QMC Block Diagram
OFFSET CORRECTION
Registers qmc_offsetA(12:0), qmc_offsetB(12:0), qmc_offsetC(12:0) and qmc_offsetD(12:0) can be used to
independently adjust the DC offsets of each channel. The offset values are in represented in 2s-complement
format with a range from -4096 to 4095.
The offset value adds a digital offset to the digital data before digital-to-analog conversion. Since the offset is
added directly to the data it may be necessary to back off the signal to prevent saturation. Both data and offset
values are LSB aligned.
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