ADS5481 datasheet(11/42 Pages) TI

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Input Amplitude − dBFS

100

110

120

130

−100 −90

−80

−70

−60

−50

−40

−30

−20

−10

G009

fS = 80 MSPS

fIN = 70 MHz

AIN = 0 to −100 dBFS

256k Point FFT

SFDR (dBFS,

Dither ON)

SNR (dBc,

Dither ON)

SNR (dBFS,

Dither ON)

SFDR (dBc,

Dither OFF)

SFDR (dBFS,

Dither OFF)

SFDR (dBc,

Dither ON)

Input Amplitude − dBFS

100

−40

−36

−32

−28

−24

−20

−16

−12

−8

−4

G010

fS = 80 MSPS

fIN = 70 MHz

AIN = 0 to −40 dBFS

256k Point FFT

SFDR (dBc,

Dither OFF)

SFDR (dBc,

Dither ON)

f − Frequency − MHz

−130

−120

−110

−100

−90

−80

−70

−60

−50

−40

−30

−20

−10

G011

fIN1 = 29.5 MHz, –7 dBFS

fIN2 = 30.5 MHz, –7 dBFS

IMD3 = 101 dBFS

SFDR = 101 dBFS

SNR = 80.9 dBFS

Dither Enabled, CLK = 80 MSPS

f − Frequency − MHz

−130

−120

−110

−100

−90

−80

−70

−60

−50

−40

−30

−20

−10

G012

fIN1 = 69.5 MHz, –7 dBFS

fIN2 = 70.5 MHz, –7 dBFS

IMD3 = 95 dBFS

SFDR = 95 dBFS

SNR = 80.5 dBFS

Dither Enabled, CLK = 80 MSPS

ADS5481

ADS5482

ADS5483

www.ti.com................................................................................................................................................... SLAS565A – JUNE 2008 – REVISED NOVEMBER 2008

TYPICAL CHARACTERISTICS (continued)

At TA = +25°C, sampling rate = max rated, 50% clock duty cycle, 3-VPP differential sinusoidal clock, analog input amplitude =

–1 dBFS, AVDD5 = 5 V, AVDD3 = 3.3 V, and DVDD3 = 3.3 V, unless otherwise noted.

ADS5481 AC PERFORMANCE

ADS5481 SFDR

INPUT AMPLITUDE (70 MHz Input Signal)

Figure 6.

Figure 7.

ADS5481 TWO-TONE INTERMODULATION DISTORTION

(FFT for 29.5 MHz and 30.5 MHz at –7 dBFS)

(FFT for 69.5 MHz and 70.5 MHz at –7 dBFS)

Figure 8.

Figure 9.

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