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DAC3482 Datasheet(PDF) 52 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) 52 Page - Texas Instruments

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DAC3482
SLAS748A
– MARCH 2011 – REVISED JUNE 2011
www.ti.com
The inverse sinc filter has a gain
> 1 at all frequencies. Therefore, the signal input to FIR4 must be reduced from
full scale to prevent saturation in the filter. The amount of back-off required depends on the signal frequency, and
is set such that at the signal frequencies the combination of the input signal and filter response is less than 1 (0
dB). For example, if the signal input to FIR4 is at 0.25 x fDAC, the response of FIR4 is 0.9 dB, and the signal must
be backed off from full scale by 0.9 dB to avoid saturation. The gain function in the QMC blocks can be used to
reduce the amplitude of the input signal. The advantage of FIR4 having a positive gain at all frequencies is that
the user is then able to optimize the back-off of the signal based on its frequency.
The filter taps for all digital filters are listed in Table 4. Note that the loss of signal amplitude may result in lower
SNR due to decrease in signal amplitude.
SPACER
Figure 61. Magnitude Spectrum for FIR0
Figure 62. Magnitude Spectrum for FIR1
SPACER
SPACER
Figure 63. Magnitude Spectrum for FIR2
Figure 64. Magnitude Spectrum for FIR3
SPACER
SPACER
52
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© 2011, Texas Instruments Incorporated
Product Folder Link(s): DAC3482



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