Datasheet

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