Datasheet

Data Sheet AD9255
Rev. C | Page 15 of 44
TYPICAL PERFORMANCE CHARACTERISTICS
AVDD = 1.8 V, DRVDD = 1.8 V, SVDD = 1.8 V, sample rate = 125 MSPS, DCS enabled, 1.0 V internal reference, 2 V p-p differential input,
VIN = −1.0 dBFS, and 32k sample, T
A
= 25°C, unless otherwise noted.
0
–20
–40
–60
–80
–100
–120
–140
0 10 20 30 40
AMPLITUDE (dBFS)
FREQUENCY (MHz)
SECOND
HARMONIC
THIRD
HARMONIC
80MSPS
2.4MHz @ –1dBFS
SNR = 78.2dB (79.2dBFS)
SFDR = 89dBc
08505-106
Figure 6. AD9255-80 Single-Tone FFT with f
IN
= 2.4 MHz
0
–20
–40
–60
–80
–100
–120
–140
0 10 20
30
40
AMPLITUDE (dBFS)
FREQUENCY (MHz)
SECOND
HARMONIC
80MSPS
70.1MHz @ –1dBFS
SNR = 77.8dB (78.8dBFS)
SFDR = 93.6dBc
THIRD
HARMONIC
08505-107
Figure 7. AD9255-80 Single-Tone FFT with f
IN
= 70.1 MHz
0
–20
–40
–60
–80
–100
–120
–140
0 10 20 30 40
AMPLITUDE (dBFS)
FREQUENCY (MHz)
80MSPS
140.1MHz @ –1dBFS
SNR = 77.0dB (78.0dBFS)
SFDR = 82.1dBc
THIRD
HARMONIC
SECOND
HARMONIC
08505-108
Figure 8. AD9255-80 Single-Tone FFT with f
IN
= 140.1 MHz
0
–20
–40
–60
–80
–100
–120
–140
0 10 20 30 40
AMPLITUDE (dBFS)
FREQUENCY (MHz)
80MSPS
200.3MHz @ –1dBFS
SNR = 75.9dB (76.9dBFS)
SFDR = 81dBc
THIRD
HARMONIC
SECOND
HARMONIC
08505-109
Figure 9. AD9255-80 Single-Tone FFT with f
IN
= 200.3 MHz
0
–20
–40
–60
–80
–100
–120
–140
0 10
20 30
40
AMPLITUDE (dBFS)
FREQUENCY (MHz)
80MSPS
70.1MHz @ –6dBFS
SNR = 73.2dB (79.2dBFS)
SFDR = 99dBc
THIRD
HARMONIC
SECOND
HARMONIC
08505-110
Figure 10. AD9255-80 Single-Tone FFT with f
IN
= 70.1 MHz at −6 dBFS with
Dither Enabled
120
100
80
60
40
20
0
–100 –80–90 –70 –60
–50 –40 –30 –20 –10
0
SNR/SFDR (dBc AND dBFS)
INPUT AMPLITUDE (dBFS)
SNR (dBFS)
SFDR (dBc)
SNR (dBc)
SFDR (dBFS)
08505-111
Figure 11. AD9255-80 Single-Tone SNR/SFDR vs. Input Amplitude (A
IN
) with
f
IN
= 98.12 MHz