Datasheet

AD9748 Data Sheet
Rev. B | Page 4 of 24
DYNAMIC SPECIFICATIONS
T
MIN
to T
MAX
, AVDD = 3.3 V, DVDD = 3.3 V, CLKVDD = 3.3 V, I
OUTFS
= 20 mA, differential transformer coupled output, 50 Ω doubly
terminated, unless otherwise noted.
Table 2.
Parameter Min Typ Max Unit
DYNAMIC PERFORMANCE
Maximum Output Update Rate (f
CLOCK
) 210 MSPS
Output Settling Time (t
ST
) (to 0.1%)
1
11 ns
Output Propagation Delay (t
PD
) 1 ns
Glitch Impulse 5 pV-s
Output Rise Time (10% to 90%)
1
2.5 ns
Output Fall Time (10% to 90%)
1
2.5 ns
Output Noise (I
OUTFS
= 20 mA)
2
50 pA/√Hz
Output Noise (I
OUTFS
= 2 mA)
2
30 pA/√Hz
AC LINEARITY
Signal-to-Noise and Distortion Ratio
f
CLOCK
= 50 MSPS; f
OUT
= 5 MHz 50 dB
f
CLOCK
= 50 MSPS; f
OUT
= 19 MHz 48 dB
f
CLOCK
= 100 MSPS; f
OUT
= 5 MHz
50
dB
f
CLOCK
= 100 MSPS; f
OUT
= 39 MHz 46 dB
f
CLOCK
= 165 MSPS; f
OUT
= 5 MHz 50 dB
f
CLOCK
= 165 MSPS; f
OUT
= 49 MHz 47 dB
f
CLOCK
= 210 MSPS; f
OUT
= 9 MHz 50 dB
f
CLOCK
= 210 MSPS; f
OUT
= 68 MHz 46 dB
Total Harmonic Distortion
f
CLOCK
= 25 MSPS; f
OUT
= 1 MHz −72 −61 dBc
f
CLOCK
= 50 MSPS; f
OUT
= 12.5 MHz −65 dBc
f
CLOCK
= 100 MSPS; f
OUT
= 25 MHz −60 dBc
f
CLOCK
= 165 MSPS; f
OUT
= 41.3 MHz −58 dBc
f
CLOCK
= 210 MSPS; f
OUT
= 68 MHz
−65
dBc
Spurious-Free Dynamic Range to Nyquist
f
CLOCK
= 25 MSPS; f
OUT
= 1 MHz
0 dBFS Output 61 72 dBc
f
CLOCK
= 65 MSPS; f
OUT
= 5 MHz 69 dBc
f
CLOCK
= 65 MSPS; f
OUT
= 19 MHz 65 dBc
f
CLOCK
= 100 MSPS; f
OUT
= 5 MHz 68 dBc
f
CLOCK
= 100 MSPS; f
OUT
= 39 MHz 62 dBc
f
CLOCK
= 165 MSPS; f
OUT
= 5 MHz 68 dBc
f
CLOCK
= 165 MSPS; f
OUT
= 49 MHz 54 dBc
f
CLOCK
= 210 MSPS; f
OUT
= 5 MHz 67 dBc
f
CLOCK
= 210 MSPS; f
OUT
= 68 MHz
60
dBc
1
Measured single-ended into 50 Ω load.
2
Output noise is measured with a full-scale output set to 20 mA with no conversion activity. It is a measure of the thermal noise only.