Data Sheet

AD6649

Rev. C | Page 5 of 40

ADC AC SPECIFICATIONS

AVDD = 1.8 V, DRVDD = 1.8 V, maximum sample rate, VIN = −1.0 dBFS differential input,1 1.75 V p-p full-scale input range,

DCS enabled, NCO enabled, FIR filter enabled, unless otherwise noted.

Table 2.

Parameter2

Temperature

Min

Typ

Max

Unit

SIGNAL-TO-NOISE RATIO (SNR)3

25°C

74.5

dBFS

25°C

74.1

dBFS

25°C

73.6

dBFS

25°C

73.0

dBFS

Full

70.9

dBFS

25°C

72.4

dBFS

SIGNAL-TO-NOISE AND DISTORTION (SINAD)

25°C

71.9

dBFS

25°C

71.5

dBFS

25°C

70.8

dBFS

25°C

70.3

dBFS

Full

68.7

dBFS

25°C

69.6

dBFS

WORST SECOND OR THIRD HARMONIC

25°C

−92

dBc

25°C

−88

dBc

25°C

−85

dBc

25°C

−85

dBc

Full

−80

dBc

25°C

−89

dBc

SPURIOUS-FREE DYNAMIC RANGE (SFDR)

25°C

92

dBc

25°C

88

dBc

25°C

85

dBc

25°C

85

dBc

Full

80

25°C

84

dBc

WORST OTHER HARMONIC OR SPUR

25°C

−95

dBc

25°C

−94

dBc

25°C

−93

dBc

25°C

−93

dBc

Full

−80

dBc

25°C

−84

dBc

TWO-TONE SFDR

25°C

88

dBc

CROSSTALK4

Full

95

dB

ANALOG INPUT BANDWIDTH

25°C

1000

MHz

1

A −1.0 dBFS input level at the analog inputs corresponds to an output level of −2.5 dBFS when using the fixed-frequency NCO and 95 MHz FIR filter. When using the

tunable-frequency NCO and 100 MHz FIR filter, the output level is −1.3 dBFS. These respective output level reductions are due to FIR filter losses. See the FIR Filters

section for more details.

2

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

3

SNR specifications are for filtered 95 MHz bandwidth.

4

Crosstalk is measured at 100 MHz with −1 dBFS on one channel and with no input on the alternate channel.