AD9708
Typical AC Characterization Curves
(AVDD = +5 V or +3 V, DVDD = +5 V or +3 V, 50
Single-Ended Output, I
OUTA
, I
OUTFS
= 20 mA, T
A
= +25 C, unless otherwise noted)
70
THD @ 50MSPS
65
SINAD/THD – dB
60
55
50
45
40
0.1
THD @ 10MSPS
THD
@ 100MSPS
SINAD/THD – dB
65
THD
@ 100MSPS
60
SINAD – dB
45
THD @ 50MSPS
55
50
45
40
0.1
70
THD @ 10MSPS
55
Doubly Terminated Load,
I
OUTFS
= 20mA
50
I
OUTFS
= 10mA
I
OUTFS
= 5mA
40
I
OUTFS
= 2.5mA
SINAD @ 10MSPS
SINAD @ 50MSPS
SINAD @ 100MSPS
10
1
FREQUENCY – MHz
100
SINAD @ 10MSPS
SINAD @ 50MSPS
SINAD @ 100MSPS
10
1
FREQUENCY – MHz
100
30
1
10
FREQUENCY – MHz
100
35
Figure 3. SINAD/THD vs. f
OUT
(AVDD
and DVDD = 5.0 V)
Figure 4. SINAD/THD vs. f
OUT
(Differ-
ential Output, AVDD and DVDD = 5.0 V)
Figure 5. SINAD vs. I
OUTFS
@ 100 MSPS
70
65 THD @ 10MSPS
SINAD/THD – dB
60
THD @ 50MSPS
55
50
45
40
0.1
70
65
SINAD/THD – dB
60
SINAD – dB
THD
@ 10MSPS
THD
@ 50MSPS
52
I
OUTFS
= 20mA
50 I
OUTFS
= 10mA
I
OUTFS
= 5mA
48
I
OUTFS
= 2.5mA
THD
@ 100MSPS
55
THD @ 100MSPS
50
45
SINAD @ 100MSPS
40
0.1
SINAD @ 10MSPS
SINAD @ 50MSPS
46
SINAD @ 10MSPS
SINAD @ 50MSPS
SINAD @ 100MSPS
1
10
FREQUENCY – MHz
100
44
1
10
FREQUENCY – MHz
100
42
0.1
1
FREQUENCY – MHz
10
Figure 6. SINAD/THD vs. f
OUT
(AVDD
and DVDD = 3.0 V)
Figure 7. SINAD/THD vs. f
OUT
(Differ-
ential Output, AVDD and DVDD = 3.0 V)
Figure 8. SINAD vs. I
OUTFS
@ 20 MSPS
0
f
CLOCK
= 25MSPS
f
OUT
= 7.81MHz
SFDR = +60.7dBc
AMPLITUDE = 0dBFS
10dB – Div
10dB – Div
0
f
CLOCK
= 125MSPS
f
OUT
= 27.0MHz
SFDR = +52.7dBc
AMPLITUDE = 0dBc
0.6
0.5
0.4
0.3
VOLTS
START: 0Hz
STOP: 62.5MHz
0.2
0.1
0.0
–0.1
–100
START: 0Hz
STOP: 12.5MHz
–100
–0.2
TIME – 5ns/Div
Figure 9. Single-Tone Spectral Plot
@ 25 MSPS
Figure 10. Single-Tone Spectral
Plot @ 125 MSPS
Figure 11. Step Response
–6–
REV. B
AD [ ANALOG DEVICES ]
