ADS5294 datasheet(24/67 Pages) TI1

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−140

−130

−120

−110

−100

−90

−80

−70

−60

−50

−40

−30

−20

−10

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

Frequency (MHz)

LF noise suppression enabled

LF noise suppression disabled

−140

−130

−120

−110

−100

−90

−80

−70

−60

−50

−40

−30

−20

−10

39.1 39.2 39.3 39.4 39.5 39.6 39.7 39.8 39.9

Frequency (MHz)

LF noise suppression enabled

LF noise suppression disabled

−150

−140

−130

−120

−110

−100

−90

−80

−70

−60

−50

−40

−30

−20

−10

0.5

1.5

2.5

3.5

4.5

Input Signal Frequency (MHz)

HPF_DISABLED

HPF_ENABLED

−125

−115

−105

−95

−85

−75

−65

−55

−45

−35

−25

−15

−5

Frequency (MHz)

ADS5294

SLAS776B – NOVEMBER 2011 – REVISED JULY 2012

www.ti.com

TYPICAL CHARACTERISTICS (continued)

Typical values are at 25°C, AVDD = 1.8 V, LVDD = 1.8V, 50% clock duty cycle, –1 dBFS differential analog input, 14 Bit/80

MSPS, ADC is configured in the internal reference mode, unless otherwise noted.

Figure 36. FFT with HPF Enabled and Disabled, No Signal

Figure 37. FFT (Full-Band) for 5 MHz Input Signal, Sample

Rate = 80MSPS with Low Frequency Noise Suppression

Enabled

Figure 38. FFT (0 to 1 MHz) for 5 MHz Input Signal, Sample

Figure 39. FFT (39 MHz to 40 MHz) for 5 MHz Input Signal,

Rate = 80 MSPS with Low Frequency Noise Suppression

Sample Rate = 80 MSPS with Low Frequency Noise

Enabled

Suppression Enabled

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