TS83102G0B ATMEL Corporation, TS83102G0B Datasheet - Page 23

• Manufacturer Part Number: TS83102G0B
• Description: 10-bit 2 GSPS ADCthis State-of-the-art 10-bit 2 GSPS Converter Offers an Unprecedented Bandwidth of 3.3 GHZ And Excellent Band Flatness, Allowing to Directly Digitize Very High if Signals (2nd And 3rd Nyquist Zones) With High Linearity : The SFDR Rem
• Manufacturer: ATMEL Corporation

Typical Reconstructed
Signals and Signal
Spectrum
Figure 17. Fs = 1.4 Gsps and Fin = 702 MHz, -1 dBFS; Decimation Factor = 16, 32 kpoints FFT
Figure 18. Fs = 1.4 Gsps and Fin = 1399 MHz, -1 dBFS; Decimation Factor = 16, 32 kpoints FFT
2101C–BDC–02/04
The ADC input signal is sampled at a full sampling rate, but the output data is 8 or 16 times
decimated so as to relax the acquisition system data rate. As a consequence, the calculation
software sees an effective frequency divided by 8 or 16, compared to the ADC clock frequency
used (Fs). The spectrum is thus displayed from DC to Fs/2 divided by the decimation factor.
Decimation only folds all spectral components between DC and Fs/2 divided by the decima-
tion factor but does not change their amplitude.
This does not have any impact on the FFT spectral characteristics because of the ergodicity of
the samples (time average = statistic average). The input frequency is chosen to respect the
coherence of the acquisition.
TS83102G0B
23