Datasheet

ADA4891-1/ADA4891-2/ADA4891-3/ADA4891-4 Data Sheet
Rev. E | Page 8 of 24
CLOSED-LOOP GAIN (dB)
FREQUENCY (MHz)
–6
–5
–4
–3
–2
–1
0
3
4
5
6
1
2
7
0.1 1
10
100
1k
+125°C
+25°C
0°C
–40°C
V
S
= 3V
G = +1
V
OUT
= 200mV p-p
R
L
= 1kΩ
08054-031
+85°C
Figure 13. Small-Signal Frequency Response vs. Temperature, V
S
= 3 V,
ADA4891-1/ADA4891-2
–0.5
–0.4
–0.3
–0.2
–0.1
0
0.1
10.1
10
100
FREQUENCY (MHz)
NORMALIZED CLOSED-LOOP GAIN (dB)
G = +2
R
F
= 604Ω
R
L
= 150Ω
V
S
= 3V
V
OUT
= 2V p-p
V
S
= 5V
V
OUT
= 1.4V p-p
V
S
= 3V
V
OUT
= 1.4V p-p
08054-019
V
S
= 5V
V
OUT
= 2V p-p
Figure 14. 0.1 dB Gain Flatness vs. Supply Voltage, G = +2,
ADA4891-1/ADA4891-2
–10
–9
–8
–7
–6
–5
–4
–3
–2
–1
0
1
0.1
1
10
100
1k
NORMALIZED CLOSED-LOOP GAIN (dB)
FREQUENCY (MHz)
V
S
= 5V
R
L
= 150Ω
V
OUT
= 2V p-p
G = +1
R
F
= 0Ω
G = –1
R
F
= 604Ω
G = +2
R
F
= 604Ω
G = +5
R
F
= 604Ω
08054-036
Figure 15. Large-Signal Frequency Response vs. Gain, V
S
= 5 V,
ADA4891-1/ADA4891-2
CLOSED-LOOP GAIN (dB)
FREQUENCY (MHz)
–6
–5
–4
–3
–2
–1
0
3
4
5
6
1
2
7
0.1 1 10 100 1k
V
S
= 3V
G = +1
V
OUT
= 200mV p-p
R
L
= 1kΩ
08054-079
+125°C
+85°C
+25°C
0°C
–40°C
Figure 16. Small-Signal Frequency Response vs. Temperature, V
S
= 3 V,
ADA4891-3/ADA4891-4
0.1
0
–0.1
–0.2
–0.3
–0.4
–0.5
0.1 1
10 100
FREQUENCY (MHz)
NORMALIZED CLOSED-LOOP GAIN (dB)
08054-080
V
S
= 3V
V
OUT
= 1.4V p-p
V
S
= 3V
V
OUT
= 2V p-p
V
S
= 5V
V
OUT
= 2V p-p
G = +2
R
F
= 374Ω
R
L
= 150Ω
V
S
= 5V
V
OUT
= 1.4V p-p
Figure 17. 0.1 dB Gain Flatness vs. Supply Voltage, G = +2,
ADA4891-3/ADA4891-4
1
0
–1
–2
–3
–4
–5
–6
–7
–8
–9
–10
0.1 1 10 100 1k
FREQUENCY (MHz)
NORMALIZED CLOSED-LOOP GAIN (dB)
08054-081
V
S
= 5V
R
L
= 150Ω
V
OUT
= 2V p-p
G = +1
R
F
= 0Ω
G = –1
R
F
= 453Ω
G = +5
R
F
= 453Ω
G = +2
R
F
= 453Ω
Figure 18. Large-Signal Frequency Response vs. Gain, V
S
= 5 V,
ADA4891-3/ADA4891-4