ADS5295IPFP datasheet(63/93 Pages) TI2

63 / 93 page

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49.1 49.2 49.3 49.4 49.5 49.6 49.7 49.8 49.9

Frequency (MHz)

LF Noise Suppression Enabled

LF Noise Suppression Disabled

G035

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Frequency (MHz)

SNR = 70.7 dBFS

SINAD = 70.4 dBFS

SFDR = 82.9 dBc

THD = 82.1 dBc

G033

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0.1

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Frequency (MHz)

LF Noise Suppression Enabled

LF Noise Suppression Disabled

G034

ADS5295

www.ti.com

SBAS595 – DECEMBER 2012

LOW-FREQUENCY NOISE SUPPRESSION

The low-frequency noise suppression (LFNS) mode is particularly useful in applications where good noise

performance is desired in the low-frequency band of dc to 1 MHz. By setting this mode, the low-frequency noise

spectrum band around dc is shifted to a similar band around fS / 2 (or the Nyquist frequency). As a result, the

noise spectrum from dc to approximately 1 MHz improves significantly, as shown in Figure 58, Figure 59, and

Figure 60.

This function can be selectively enabled in each channel using the LFNS_CH register bits. Figure 58, Figure 59,

and Figure 60 show the effect of this mode on the spectrum.

Figure 58. Full-Scale Input Amplitude

Figure 59. Spectrum (Zoomed) From DC to 1 MHz

Figure 60. Spectrum (Zoomed) in 1-MHz Band from 49 MHz to 50 MHz (fS = 100 MSPS)

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