AD9681-125EBZ datasheet(5/40 Pages) AD

Part #	AD9681-125EBZ

Description	Octal, 14-Bit, 125 MSPS, Serial LVDS, 1.8 V Analog-to-Digital Converter

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Data Sheet

AD9681

Rev. A | Page 5 of 40

AC SPECIFICATIONS

AVDD = 1.8 V, DRVDD = 1.8 V, 2 V p-p differential input, 1.0 V internal reference, AIN = −1.0 dBFS, unless otherwise noted.

Table 2.

Parameter1

Temp

Min

Typ

Max

Unit

SIGNAL-TO-NOISE RATIO (SNR)

fIN = 9.7 MHz

25°C

74.8

dBFS

fIN = 19.7 MHz

25°C

74.7

dBFS

fIN = 69.5 MHz

Full

72.6

73.9

dBFS

fIN = 139.5 MHz

25°C

71.5

dBFS

fIN = 201 MHz

25°C

69.6

dBFS

fIN = 301 MHz

25°C

66.6

dBFS

SIGNAL-TO-NOISE AND DISTORTION RATIO (SINAD)

fIN = 9.7 MHz

25°C

74.7

dBFS

fIN = 19.7 MHz

25°C

74.7

dBFS

fIN = 69.5 MHz

Full

72.3

73.8

dBFS

fIN = 139.5 MHz

25°C

71.4

dBFS

fIN = 201 MHz

25°C

69.3

dBFS

fIN = 301 MHz

25°C

65.8

dBFS

EFFECTIVE NUMBER OF BITS (ENOB)

fIN = 9.7 MHz

25°C

12.1

Bits

fIN = 19.7 MHz

25°C

12.1

Bits

fIN = 69.5 MHz

Full

11.7

12.0

Bits

fIN = 139.5 MHz

25°C

11.6

Bits

fIN = 201 MHz

25°C

11.2

Bits

fIN = 301 MHz

25°C

10.6

Bits

SPURIOUS-FREE DYNAMIC RANGE (SFDR)

fIN = 9.7 MHz

25°C

94

dBc

fIN = 19.7 MHz

25°C

94

dBc

fIN = 69.5 MHz

Full

81

90

dBc

fIN = 139.5 MHz

25°C

87

dBc

fIN = 201 MHz

25°C

83

dBc

fIN = 301 MHz

25°C

73

dBc

WORST HARMONIC (SECOND OR THIRD)

fIN = 9.7 MHz

25°C

−94

dBc

fIN = 19.7 MHz

25°C

−94

dBc

fIN = 69.5 MHz

Full

−90

−81

dBc

fIN = 139.5 MHz

25°C

−87

dBc

fIN = 201 MHz

25°C

−83

dBc

fIN = 301 MHz

25°C

−73

dBc

WORST OTHER (EXCLUDING SECOND OR THIRD)

fIN = 9.7 MHz

25°C

−98

dBc

fIN = 19.7 MHz

25°C

−94

dBc

fIN = 69.5 MHz

Full

−96

−84

dBc

fIN = 139.5 MHz

25°C

−90

dBc

fIN = 201 MHz

25°C

−85

dBc

fIN = 301 MHz

25°C

−75

dBc

TWO-TONE INTERMODULATION DISTORTION (IMD)—AIN1 AND AIN2 = −7.0 dBFS

fIN1 = 70 MHz, fIN2 = 72.5 MHz

25°C

94

dBc

CROSSTALK, WORST ADJACENT CHANNEL2

25°C

−83

dB

Crosstalk, Worst Adjacent Channel Overrange Condition3

25°C

−79

dB

ANALOG INPUT BANDWIDTH, FULL POWER

25°C

650

MHz

1 See the AN-835 Application Note, Understanding High Speed ADC Testing and Evaluation, for definitions and for details on how these tests were completed.

2 Crosstalk is measured at 70 MHz, with −1.0 dBFS analog input on one channel and no input on the adjacent channel.

3 Overrange condition is defined as 3 dB above input full scale.

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