Datasheet

ADA4891-1/ADA4891-2/ADA4891-3/ADA4891-4 Data Sheet
Rev. E | Page 10 of 24
–100
–90
–80
–70
–60
–50
–
40
00.51.0
1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
DISTORTION (dBc)
OUTPUT VOLTAGE (V p-p)
V
S
= 5V
SECOND HARMONIC
V
S
= 5V
THIRD HARMONIC
V
S
= 3V
SECOND HARMONIC
V
S
= 3V
THIRD HARMONIC
G = +2
R
F
= 604Ω
R
L
= 150Ω
f
C
= 1MHz
08054-042
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
OPEN-LOOP GAIN (dB)
PHASE (Degrees)
FREQUENCY (MHz)
V
S
= 5V
R
L
= 1kΩ
08054-043
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)
NORMALIZED CLOSED-LOOP GAIN (dB)
08054-044
V
S
= 5V
G = +2
R
L
= 150Ω
V
OUT
= 200mV p-p
C
L
= 47pF
C
L
= 22pF
C
L
= 10pF
C
L
= 0pF
Figure 27. Small-Signal Frequency Response vs. C
L
,
ADA4891-1/ADA4891-2
1
10
100
1k
10 100
VOLTAGE NOISE (nV/ Hz)
FREQUENCY (Hz)
1k 10k 100k 1M 10M
V
S
= 5V
G = +1
08054-045
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)
DIFFERENTIAL
GAIN ERROR (%)
DIFFERENTIAL
PHASE ERROR (Degrees)
V
S
= 5V, G = +2
R
F
= 604Ω, R
L
= 150Ω
V
S
= 5V, G = +2
R
F
= 604Ω, R
L
= 150Ω
1
ST
2
ND
3
RD
4
TH
5
TH
6
TH
7
TH
8
TH
9
TH
10
TH
1
ST
2
ND
3
RD
4
TH
5
TH
6
TH
7
TH
8
TH
9
TH
10
TH
08054-060
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)
NORMALIZED CLOSED-LOOP GAIN (dB)
08054-083
V
S
= 5V
G = +2
R
L
= 150Ω
V
OUT
= 200mV p-p
C
L
= 47pF
C
L
= 22pF
C
L
= 10pF
C
L
= 0pF
Figure 30. Small-Signal Frequency Response vs. C
L
,
ADA4891-3/ADA4891-4