AD9261 datasheet(5/29 Pages) AD

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AD9261

Rev. 0 | Page 4 of 28

AC SPECIFICATIONS

All power supplies set to 1.8 V, 640 MHz sample rate, 0.5 V internal reference, PLL disabled, 40 MSPS output data rate, AIN = −2.0 dBFS,

unless otherwise noted.

Table 2.

Parameter1

Temp

Min

Typ

Max

Unit

SIGNAL-TO-NOISE RATIO (SNR)

fIN = 2.4 MHz

Full

fIN = 4.2 MHz

25°C

fIN = 8.4 MHz

25°C

EFFECTIVE NUMBER OF BITS (ENOB)

fIN = 2.4 MHz

25°C

13.5

Bits

fIN = 4.2 MHz

25°C

13.5

Bits

fIN = 8.4 MHz

25°C

13.5

Bits

SPURIOUS-FREE DYNAMIC RANGE (SFDR)

fIN = 2.4 MHz

Full

dBc

fIN = 4.2 MHz

25°C

dBc

fIN = 8.4 MHz

25°C

<120

dBc

NOISE SPECTRAL DENSITY (NSD)

AIN= −2 dBFS

Full

−155

−153

dB/Hz

AIN = −40 dBFS

Full

−156

−154.5

dB/Hz

NOISE FIGURE2

25°C

TWO-TONE SFDR

fIN1 = 2.1 MHz at −8 dBFS, fIN2 = 2.4 MHz at −8 dBFS

25°C

dBc

fIN1 = 3.6 MHz at −8 dBFS, fIN2 = 4.2 MHz at −8 dBFS

25°C

92.5

dBc

fIN1 = 7.2 MHz at −8 dBFS, fIN2 = 8.4 MHz at −8 dBFS

25°C

92.5

dBc

ANALOG INPUT BANDWIDTH

25°C

MHz

APERTURE JITTER

25°C

ps rms

1 See the AN-835 Application Note, Understanding High Speed ADC Testing and Evaluation, for a complete set of definitions.

2 Noise figure with respect to 50 Ω. AD9261 internal impedance is 1000 Ω differential. See the AN-835 Application Note for a definition.

DIGITAL DECIMATION FILTERING CHARACTERISTICS

All power supplies set to 1.8 V, 640 MHz sample rate, 0.5 V internal reference, PLL disabled, AIN = −2.0 dBFS, unless otherwise noted.

Table 3.

2.5 MHz BW

5 MHZ BW

10 MHz BW

Parameter1

Min

Typ

Max

Min

Typ

Max

Min

Typ

Max

Unit

Pass-Band Transition

2.5

3.75

6.5

MHz

Pass-Band Ripple

<0.1

Stop Band

3.75 MHz − fS/2

6.5 MHz − fS/2

13 MHz − fS/2

MHz

Stop Band Attenuation

>85

1 See the AN-835 Application Note, Understanding High Speed ADC Testing and Evaluation, for a complete set of definitions.

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