Datasheet

AD8044
REV. B
–7–
FREQUENCY
(
Hz
)
INPUT VOLTAGE NOISE (nV/ Hz)
300
10 100
1k 10k 100k
1M 10M
100
10
3
1
30
Figure 10. Input Voltage Noise vs. Frequency
FUNDAMENTAL FREQUENCY
(
MHz
)
–30
–80
–100
–40
–50
–60
–70
–90
TOTAL HARMONIC DISTORTION (dBc)
1108567 9234
V
S
= +3V,
R
L
= 100⍀
A
V
= –1
V
S
= +5V,
R
L
= 100⍀
A
V
= +1
V
S
= +5V,
R
L
= 100⍀
A
V
= +2
V
S
= +5V,
R
L
= 1k⍀
A
V
= +1
V
S
= +5V,
R
L
= 1k⍀
A
V
= +2
V
O
= 2V p-p
Figure 11. Total Harmonic Distortion
WORST HARMONIC (dBc)
OUTPUT VOLTAGE (V p-p)
0
50.5 1 1.5 2 2.5 3 3.5 4 4.5
–30
–40
–120
–80
–90
–100
–110
–60
–70
–50
–130
–140
V
S
= +5V
R
L
= 2k⍀ TO 2.5V
G = +2
1MHz
5MHz
10MHz
Figure 12. Worst Harmonic vs. Output Voltage
DIFF PHASE (Degrees)
0 10010 20 30 40 50 60 70 80 90
DIFF GAIN (%)
–0.04
0.00
–0.02
0.02
0.01
–0.01
–0.03
0.03
V
S
= +5V
G = +2
R
L
= 150⍀
–0.15
0.05
–0.05
0.15
0.10
0.00
–0.10
0.20
–0.20
MODULATING RAMP LEVEL
(
IRE
)
V
S
= +5V
G = +2
R
L
= 150⍀
0 10010 20 30 40 50 60 70 80 90
Figure 13. Differential Gain and Phase Errors
0.3
–0.1
–0.6
0.2
0.1
0.0
–0.2
–0.3
–0.4
–0.5
1M 100M10M
NORMALIZED GAIN (dB)
V
S
= +5V
R
F
= 200⍀
R
L
= 150⍀ TO 2.5V
G = +2
V
i
= 0.2V p-p
11.6MHz
FREQUENCY
(
Hz
)
Figure 14. 0.1 dB Gain Flatness
80
40
–10
70
60
50
30
20
10
0
–20
30k 100k
OPEN-LOOP GAIN (dB)
1M
10M 100M
GAIN
PHASE
80MHz
FREQUENCY (Hz)
V
S
= +5V
R
L
= 2k⍀
C
L
= 5pF
180
135
90
45
0
PHASE MARGIN
(
De
g
rees
)
Figure 15. Open-Loop Gain and Phase Margin
vs. Frequency