Datasheet

AD9257 Data Sheet
Rev. A | Page 4 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. CLK
divider = 8 used for typical characteristics at input frequency ≥ 19.7 MHz.
Table 2.
Parameter
1
Temp
AD9257-40 AD9257-65
Unit Min Typ Max Min Typ Max
SIGNAL-TO-NOISE RATIO (SNR)
f
IN
= 9.7 MHz 25°C 75.9 75.7 dBFS
f
IN
= 19.7 MHz Full 73.5 75.8 73.3 75.6 dBFS
f
IN
= 30.5 MHz 25°C 75.7 75.5 dBFS
f
IN
= 63.5 MHz 25°C 74.9 dBFS
f
IN
= 69.5 MHz
25°C
74.7
dBFS
f
IN
= 123.4 MHz 25°C 73.2 dBFS
SIGNAL-TO-NOISE AND DISTORTION RATIO (SINAD)
f
IN
= 9.7 MHz 25°C 75.8 75.6 dBFS
f
IN
= 19.7 MHz Full 72.5 75.7 72.0 75.6 dBFS
f
IN
= 30.5 MHz 25°C 75.6 75.4 dBFS
f
IN
= 63.5 MHz 25°C 74.8 dBFS
f
IN
= 69.5 MHz 25°C 74.5 dBFS
f
IN
= 123.4 MHz 25°C 72.8 dBFS
EFFECTIVE NUMBER OF BITS (ENOB)
f
IN
= 9.7 MHz 25°C 12.3 12.3 Bits
f
IN
= 19.7 MHz Full 11.7 12.3 11.7 12.3 Bits
f
IN
= 30.5 MHz 25°C 12.3 12.2 Bits
f
IN
= 63.5 MHz 25°C 12.1 Bits
f
IN
= 69.5 MHz 25°C 12.1 Bits
f
IN
= 123.4 MHz 25°C 11.8 Bits
SPURIOUS-FREE DYNAMIC RANGE (SFDR)
f
IN
= 9.7 MHz 25°C 96 96 dBc
f
IN
= 19.7 MHz Full 80 96 79 96 dBc
f
IN
= 30.5 MHz 25°C 97 91 dBc
f
IN
= 63.5 MHz 25°C 95 dBc
f
IN
= 69.5 MHz 25°C 87 dBc
f
IN
= 123.4 MHz 25°C 83 dBc
WORST HARMONIC (SECOND OR THIRD)
f
IN
= 9.7 MHz 25°C −99 −99 dBc
f
IN
= 19.7 MHz Full −96 −80 −98 −79 dBc
f
IN
= 30.5 MHz 25°C −100 −91 dBc
f
IN
= 63.5 MHz
25°C
−98
dBc
f
IN
= 69.5 MHz 25°C −87 dBc
f
IN
= 123.4 MHz 25°C −83 dBc
WORST OTHER (EXCLUDING SECOND OR THIRD)
f
IN
= 9.7 MHz 25°C −96 −96 dBc
f
IN
= 19.7 MHz Full −99 −86 −96 −88 dBc
f
IN
= 30.5 MHz 25°C −97 −98 dBc
f
IN
= 63.5 MHz 25°C −95 dBc
f
IN
= 69.5 MHz 25°C −98 dBc
f
IN
= 123.4 MHz 25°C −94 dBc
TWO-TONE INTERMODULATION DISTORTION (IMD)—AIN1
AND AIN2 = −7.0 dBFS
f
IN1
= 8 MHz, f
IN2
= 10 MHz 25°C 95 dBc
f
IN1
= 30 MHz, f
IN2
= 32 MHz 25°C 92 dBc