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DAC5687MPZPEP Folha de dados(PDF) 40 Page - Texas Instruments

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Nome de Peças DAC5687MPZPEP
Descrição Electrónicos  16-BIT 500-MSPS 2쨈??쨈 INTERPOLATING DUAL-CHANNEL DIGITAL-TO-ANALOG CONVERTER (DAC)
PDF  75 Pages
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Fabricante Electrônico  TI1 [Texas Instruments]
Página de início  http://www.ti.com
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DAC5687MPZPEP Folha de dados(HTML) 40 Page - Texas Instruments

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X
X
ΣΣ
X
X
X
X
Q(t)
I(t)
11
11
10
qmb_gain/210
{0, 1/210 ,
…, 2 −1/210 }
qm_phase/210
{−1/2, −1/2 + 1/210,
… , 1/2 −1/210}
qma_gain/210
{0, 1/210 ,
…, 2 −1/210 }
L
O
L
O
side-
band
side-
band
Uncorrected
Corrected
DAC Offset Control
DAC5687-EP
SGLS333 – JUNE 2006
Figure 41. QMC Block Diagram
Figure 42. Example of Sideband Optimization Using QMC Phase and Gain Adjustments
Registers qma_offset and qmb_offset control the I and Q path offsets and are 13-bit values with a range of
–4096 to 4095. The DAC offset value adds a digital offset to the digital data before digital-to-analog conversion.
The qma_gain and qmb_gain registers can be used to backoff the signal before the offset to prevent saturation
when the offset value is added to the digital signal.
40
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