Datasheet

DAC5682Z
SLLS853E –AUGUST 2007–REVISED AUGUST 2012 www.ti.com
FIR FILTERS
Figure 29 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 76dB of stop-band attenuation. Figure 30 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 31. The filter taps for both FIR0 and FIR1 are listed in Table 5.
Figure 29. Magnitude Spectrum for FIR0 and FIR1 Figure 30. FIR0 and FIR1 Transition Band
Figure 31. Magnitude Composite Spectrum for 4x Interpolation Mode
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