Datasheet

AD9246
Rev. A | Page 12 of 44
0
–140
0 62.500
FREQUENCY (MHz)
AMPLITUDE (dBFS)
–20
–40
–60
–80
–100
–120
15.625 31.250 46.875
125MSPS
225.3MHz @ –1dBFS
SNR = 70.3dB (71.3dBFS)
ENOB = 11.3 BITS
SFDR = 80.4dBc
05491-019
Figure 18. AD9246-125 Single-Tone FFT with f
IN
= 225.3 MHz
0
–140
0 62.500
FREQUENCY (MHz)
AMPLITUDE (dBFS)
–20
–40
–60
–80
–100
–120
15.625 31.250 46.875
125MSPS
300.3MHz @ –1dBFS
SNR = 69.3dB (70.3dBFS)
ENOB = 11 BITS
SFDR = 77.5dBc
05491-020
Figure 19. AD9246-125 Single-Tone FFT with f
IN
= 300.3 MHz
120
0
–90 0
INPUT AMPLITUDE (dBFS)
SNR/SFDR (dBc and dBFS)
SNR (dBFS)
SFDR (dBFS)
SNR (dBc)
SFDR (dBc)
85dB REFERENCE LINE
100
80
60
40
20
–80 –70 –60 –50 –40 –30 –20 –10
05491-040
Figure 20. AD9246 Single-Tone SNR/SFDR vs. Input Amplitude (AIN)
with f
IN
= 2.4 MHz
95
65
0 250
INPUT FREQUENCY (MHz)
SNR/SFDR (dBc)
90
85
80
75
70
50 100 150 200
SFDR = –40°C
SNR = –40°C
SFDR = +25°C
SNR = +25°C
SFDR = +85°C
SNR = +85°C
05491-022
Figure 21. AD9246 Single-Tone SNR/SFDR vs. Input Frequency (f
IN
) and
Temperature with 2 V p-p Full Scale
95
65
0 250
INPUT FREQUENCY (MHz)
SNR/SFDR (dBc)
90
85
80
75
70
50 100 150 200
SFDR = –40°C
SNR = –40°C
SFDR = +25°C
SNR = +25°C
SFDR = +85°C
SNR = +85°C
05491-023
Figure 22. AD9246 Single-Tone SNR/SFDR vs. Input Frequency (f
IN
) and
Temperature with 1 V p-p Full Scale
0
–1.00
–40 80
TEMPERATURE (°C)
–20 0 204060
GAIN/OFFSET ERROR (%FSR)
–0.25
–0.50
–0.75
OFFSET ERROR
GAIN ERROR
05491-035
Figure 23. AD9246 Gain and Offset vs. Temperature