Datasheet

AD9251
Rev. A | Page 5 of 36
AC SPECIFICATIONS
AVDD = 1.8 V; DRVDD = 1.8 V, maximum sample rate, 2 V p-p differential input, 1.0 V internal reference; AIN = −1.0 dBFS,
DCS disabled, unless otherwise noted.
Table 2.
Parameter
1
Temp
AD9251-20/AD9251-40 AD9251-65 AD9251-80
Unit Min Typ Max Min Typ Max Min Typ Max
SIGNAL-TO-NOISE RATIO (SNR)
f
IN
= 9.7 MHz 25°C 74.7 74.5 74.3 dBFS
f
IN
= 30.5 MHz 25°C 74.4 74.3 74.1 dBFS
Full 73.6 73.6 dBFS
f
IN
= 70 MHz 25°C 73.7 73.7 73.6 dBFS
Full 72.5 dBFS
f
IN
= 200 MHz 25°C 71.5 71.5 71.5 dBFS
SIGNAL-TO-NOISE-AND-DISTORTION (SINAD)
f
IN
= 9.7 MHz 25°C 74.6 74.4 74.1 dBFS
f
IN
= 30.5 MHz 25°C 74.3 74.2 74.0 dBFS
Full 73.4 73.4 dBFS
f
IN
= 70 MHz 25°C 73.6 73.6 73.5 dBFS
Full 72.4 dBFS
f
IN
= 200 MHz 25°C 70.0 70.0 70.0 dBFS
EFFECTIVE NUMBER OF BITS (ENOB)
f
IN
= 9.7 MHz 25°C 12.0 12.0 12.0 Bits
f
IN
= 30.5 MHz 25°C 12.0 12.0 12.0 Bits
f
IN
= 70 MHz 25°C 11.9 11.9 11.9 Bits
f
IN
= 200 MHz 25°C 11.3 11.3 11.3 Bits
WORST SECOND OR THIRD HARMONIC
f
IN
= 9.7 MHz 25°C −95 −95 −93 dBc
f
IN
= 30.5 MHz 25°C −95 −95 −93 dBc
Full −81 −81 dBc
f
IN
= 70 MHz 25°C −94 −94 −92 dBc
Full −81 dBc
f
IN
= 200 MHz 25°C −80 −80 −80 dBc
SPURIOUS-FREE DYNAMIC RANGE (SFDR)
f
IN
= 9.7 MHz 25°C 95 95 93 dBc
f
IN
= 30.5 MHz 25°C 94 94 93 dBc
Full 81 81 dBc
f
IN
= 70 MHz 25°C 93 93 92 dBc
Full 81 dBc
f
IN
= 200 MHz 25°C 80 80 80 dBc
WORST OTHER (HARMONIC OR SPUR)
f
IN
= 9.7 MHz 25°C −98 −98 −97 dBc
f
IN
= 30.5 MHz 25°C −98 −98 −97 dBc
Full −90 −90 dBc
f
IN
= 70 MHz 25°C −98 −98 −96 dBc
Full −89 dBc
f
IN
= 200 MHz 25°C −95 −95 −95 dBc
TWO-TONE SFDR
f
IN
= 30.5 MHz (−7 dBFS), 32.5 MHz (−7 dBFS) 25°C 90 90 90 dBc
CROSSTALK
2
Full −110 −110 −110 dBc
ANALOG INPUT BANDWIDTH 25°C 700 700 700 MHz
1
See the AN-835 Application Note, Understanding High Speed ADC Testing and Evaluation, for a complete set of definitions.
2
Crosstalk is measured at 100 MHz with −1.0 dBFS on one channel and no input on the alternate channel.