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DAC3482 Datasheet(PDF) 55 Page - Texas Instruments

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Part # DAC3482
Description  Dual-Channel, 16-BIT, 1.25 GSPS Digital-to-Analog Converter (DAC)
PDF  79 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

DAC3482 Datasheet(HTML) 55 Page - Texas Instruments

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background image
B0471-01
16
16
16
16
16
16
16
16
sine
16
sine
16
sine
16
cosine
16
cosine
16
cosine
16
Fs/2
Mixer
±Fs/4
Mixer
Complex
Signal
Multiplier
Numerically
Controlled
Oscillator
Fixed Fs/8
Oscillator
I Data In
Q Data In
I Data Out
Q Data Out
CMIX<1>
CMIX<2> CMIX<0>
CMIX<3>
NCO_ENA
Frequency
Register
32
Accumulator
32
RESET
CLK
NCO SYNC
via
syncsel_NCO[3:0]
32
32
Phase
Register
16
16
16
Look-Up
Table
sin
cos
Σ
Σ
16
16
f
DAC
B0026-03
NCO _ CLK
NCO
32
freq f
f
2
´
=
DAC3482
www.ti.com
SLAS748A
– MARCH 2011 – REVISED JUNE 2011
COMPLEX SIGNAL MIXER
The DAC3482 has two paths of complex signal mixer blocks that contain two full complex mixer (FMIX) blocks
and power saving coarse mixer (CMIX) blocks. The signal path is shown in Figure 70.
Figure 70. Path of Complex Signal Mixer
FULL COMPLEX MIXER
The DAC3482 has a full complex mixer (FMIX) block with a Numerically Controlled Oscillators (NCO) that
enables flexible frequency placement without imposing additional limitations in the signal bandwidth. The NCO
has a 32-bit frequency registers (phaseadd(31:0)) and a 16-bit phase register (phaseoffset(15:0)) that generate
the sine and cosine terms for the complex mixing. The NCO block diagram is shown below in Figure 71.
Figure 71. NCO Block Diagram
Synchronization of the NCOs occurs by resetting the NCO accumulators to zero. The synchronization source is
selected by syncsel_NCO(3:0) in config31. The frequency word in the phaseadd(31:0) register is added to the
accumulators every clock cycle, fDAC. The output frequency of the NCO is:
(1)
Copyright
© 2011, Texas Instruments Incorporated
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