ADA4891-1/ADA4891-2/ADA4891-3/ADA4891-4
Data Sheet
Rev. E | Page 10 of 24
–100
–90
–80
–70
–60
–50
–40
00.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
DI
S
T
O
R
T
IO
N
(
d
Bc)
OUTPUT VOLTAGE (V p-p)
VS = 5V
SECOND HARMONIC
VS = 5V
THIRD HARMONIC
VS = 3V
SECOND HARMONIC
VS = 3V
THIRD HARMONIC
G = +2
RF = 604
RL = 150
fC = 1MHz
08
05
4-
04
2
Figure 25. Harmonic Distortion (HD2, HD3) vs. Output Voltage, G = +2
–180
–162
–144
–126
–108
–90
–72
–54
–36
–18
0
GAIN
PHASE
–10
0
10
20
30
40
50
60
70
80
90
0.001
0.01
0.1
1
10
100
1k
OP
E
N
-L
OO
P
GA
IN
(
d
B
)
P
HAS
E
(
D
eg
rees)
FREQUENCY (MHz)
VS = 5V
RL = 1k
08
054
-04
3
Figure 26. Open-Loop Gain and Phase vs. Frequency
5
6
7
4
3
2
1
0
–1
–2
–3
–4
0.1
1
10
100
1k
FREQUENCY (MHz)
NO
RM
AL
IZ
E
D
CL
O
S
E
D
-L
O
P
G
A
IN
(d
B)
08
05
4-
0
44
VS = 5V
G = +2
RL = 150
VOUT = 200mV p-p
CL = 47pF
CL = 22pF
CL = 10pF
CL = 0pF
Figure 27. Small-Signal Frequency Response vs. CL,
ADA4891-1/ADA4891-2
1
10
100
1k
10
100
V
O
LT
A
G
E
N
O
ISE
(
n
V
/
Hz
)
FREQUENCY (Hz)
1k
10k
100k
1M
10M
VS = 5V
G = +1
08
05
4-
04
5
Figure 28. Input Voltage Noise vs. Frequency
0.06
–0.06
0.04
0.02
0
–0.04
–0.02
0.2
0.1
0
–0.1
–0.2
–0.3
0.3
MODULATING RAMP LEVEL (IRE)
DI
F
E
RE
NT
IAL
G
AI
N
E
R
RO
R
(
%
)
D
IFF
E
R
E
N
TI
A
L
PH
A
SE
E
R
O
R
(D
eg
re
es
)
VS = 5V, G = +2
RF = 604, RL = 150
VS = 5V, G = +2
RF = 604, RL = 150
1ST
2ND
3RD
4TH
5TH
6TH
7TH
8TH
9TH 10TH
1ST
2ND
3RD
4TH
5TH
6TH
7TH
8TH
9TH 10TH
08
05
4-
06
0
Figure 29. Differential Gain and Phase Errors
5
6
7
4
3
2
1
0
–1
–2
–3
–4
0.1
1
10
100
1k
FREQUENCY (MHz)
NO
RM
AL
IZ
E
D
CL
O
S
E
D
-L
O
P
G
A
IN
(d
B)
08
05
4-
0
83
VS = 5V
G = +2
RL = 150
VOUT = 200mV p-p
CL = 47pF
CL = 22pF
CL = 10pF
CL = 0pF
Figure 30. Small-Signal Frequency Response vs. CL,
ADA4891-3/ADA4891-4
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