Typical Performance Characteristics– AD8138
Unless otherwise noted, GAIN = 1, R
G
= R
F
= R
L,dm
= 499
6
V
IN
= 0.2V p-p
C
F
= 0pF
3
V
S
= +5V
GAIN – dB
GAIN – dB
, T
A
= +25 C; Refer to Figure 1 for test setup.
0.5
V
S
= 5V
V
IN
= 0.2V p-p
V
S
= 5V
V
IN
= 0.2V p-p
0.3
C
F
= 0pF
C
F
= 0pF
6
3
0
V
S
=
–3
5V
0
C
F
= 1pF
GAIN – dB
0.1
–3
–0.1
C
F
= 1pF
–6
–6
–0.3
–9
1
10
100
FREQUENCY – MHz
1000
–9
1
10
100
FREQUENCY – MHz
1000
–0.5
1
10
FREQUENCY – MHz
100
Figure 2. Small Signal Frequency
Response
Figure 3. Small Signal Frequency
Response
Figure 4. 0.1 dB Flatness vs.
Frequency
6
V
IN
= 2V p-p
C
F
= 0pF
3
V
S
= +5V
GAIN – dB
GAIN – dB
6
V
IN
= 2V p-p
V
S
= 5V
3
C
F
= 0pF
0
C
F
= 1pF
GAIN – dB
30
20
G = 10, R
F
= 4.99k
G = 5, R
F
= 2.49k
V
S
= 5V
C
F
= 0pF
V
OUT,dm
= 0.2V p-p
R
G
= 499
0
V
S
=
–3
5V
10
G = 2, R
F
= 1k
G = 1, R
F
= 499
–3
0
–6
–6
–9
1
10
100
FREQUENCY – MHz
1000
–9
1
10
100
FREQUENCY – MHz
1000
–10
1
10
100
FREQUENCY – MHz
1000
Figure 5. Large Signal Frequency
Response
Figure 6. Large Signal Frequency
Response
Figure 7. Small Signal Frequency
Response for Various Gains
–50
–60
V
OUT,dm
= 2V p-p
R
L
= 800
–40
–50
V
OUT,dm
= 4V p-p
R
L
= 800
HD3(V
S
= +5V)
–30
–40
DISTORTION – dBc
–50
HD2(V
S
= +5)
–60
–70
–80
–90
–100
–4
HD3(V
S
= +5)
V
OUT,dm
= 2V p-p
R
L
= 800
F
O
= 20MHz
DISTORTION – dBc
HD2(V
S
= +5V)
HD2(V
S
=
5V)
–80
–90
–100
–110
–120
0
DISTORTION – dBc
–70
–60
–70
–80
HD2(V
S
= +5V)
HD2(V
S
=
5V)
HD3(V
S
= +5V)
HD3(V
S
=
5V)
–90
–100
–110
HD3(V
S
=
HD2(V
S
=
–3
5)
5)
HD3(V
S
=
0
5V)
70
20
30
40
50
60
10
FUNDAMENTAL FREQUENCY – MHz
70
20
30
40
50
60
10
FUNDAMENTAL FREQUENCY – MHz
–2
–1
0
1
2
V
OCM
DC OUTPUT – Volts
3
4
Figure 8. Harmonic Distortion vs.
Frequency
Figure 9. Harmonic Distortion vs.
Frequency
Figure 10. Harmonic Distortion vs.
V
OCM
REV. A
–5–
AD [ ANALOG DEVICES ]
