DAC5682Z_15 Datasheet, PDF (20/66 Pages) Texas Instruments – DAC5682Z 16-Bit, 1.0 GSPS 2x-4x Interpolating Dual-Channel Digital-to-Analog Converter (DAC)

DAC5682Z
SLLS853F – AUGUST 2007 – REVISED JANUARY 2015
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8.3 Feature Description
8.3.1 FIR Filters
Figure 24 shows the magnitude spectrum response for the identical 47-tap FIR0 and FIR1 filters. The transition
band is from 0.4 to 0.6 × F_IN (the input data rate for the FIR filter) with <0.002 dB of pass-band ripple and
approximately 76 dB of stop-band attenuation. Figure 25 shows the region from 0.35 to 0.45 × F_IN – up to 0.44x
FIN there is less than 0.4 dB attenuation. The composite spectrum for x4 interpolation mode, the cascaded
response of FIR0 and FIR1, is shown in Figure 26. The filter taps for both FIR0 and FIR1 are listed in Table 1.
Figure 24. Magnitude Spectrum for FIR0 and FIR1
Figure 25. FIR0 and FIR1 Transition Band
Figure 26. Magnitude Composite Spectrum for 4x Interpolation Mode
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