ADC32RF83 datasheet(40/138 Pages) TI

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Filter

Transition

Band

Band That Folds Back On

Top of Transition Band

Bands That Aliases On

Top of Signal Band

ADC

NCO 1,

16 Bits

NCO 2,

16 Bits

Filter

3 GSPS

IQ 3 GSPS

IQ Output

Band 1

IQ Output

Band 2

fS/2

fS/4

Band 1

Band 2

fS/16

Band 2

NCO 1

NCO 2

fS/16

Band 1

750 MSPS

ADC32RF80, ADC32RF83

SBAS774A – MAY 2016 – REVISED DECEMBER 2016

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Product Folder Links: ADC32RF80 ADC32RF83

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A dual-band example with a divide-by-8 complex is shown in Figure 96.

Figure 96. Dual-Band Example

The decimation filter responses normalized to the ADC sampling clock are illustrated in Figure 96 to Figure 119

and can be interpreted as follows:

Each figure contains the filter pass-band, transition bands, and alias bands, as shown in Figure 97. The x-axis in

Figure 97 shows the offset frequency (after the NCO frequency shift) normalized to the ADC sampling clock

frequency.

For example, in the divide-by-4 complex, the output data rate is an fS / 4 complex with a Nyquist zone of fS / 8 or

0.125 × fS. The transition band is centered around 0.125 × fS and the alias transition band is centered at 0.375 ×

fS. The alias bands that alias on top of the wanted signal band are centered at 0.25 × fS and 0.5 × fS (and are

colored in red).

The decimation filters of the ADC32RF8x provide greater than 90-dB attenuation for the alias bands.

Figure 97. Interpretation of the Decimation Filter Plots

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