Datasheet

OPA847
6
SBOS251E
www.ti.com
TYPICAL CHARACTERISTICS: V
S
= ±5V (Cont.)
T
A
= 25°C, G = +20V/V, R
G
= 39.2Ω, and R
L
= 100Ω, unless otherwise noted.
10
1
0
INPUT VOLTAGE AND CURRENT NOISE
Frequency (Hz)
Voltage Noise (nV/√Hz)
Current Voise (pA/√Hz)
10
1
10
2
10
3
10
4
10
5
10
6
10
7
2.7pA/√Hz
Current Noise
0.85nV/√Hz
Voltage Noise
50
45
40
35
30
25
20
2-TONE, 3RD-ORDER INTERMODULATION INTERCEPT
Frequency (MHz)
Intercept Point (+dBm)
5101520253035404550
G = +20V/V
20dB to matched load.
750Ω
50Ω
OPA847
P
I
P
O
50Ω
50Ω
39.2Ω
0.5
0.4
0.3
0.2
0.1
0
–0.1
–0.2
–0.3
–0.4
–0.5
NONINVERTING GAIN FLATNESS TUNE
Frequency (MHz)
Deviation from 21.58dB Gain (0.1dB)
1 10 100 1000
NG = 12
NG = 14
NG = 20
NG = 18
NG = 16
V
O
= 200mV
PP
A
V
= +12V/V
NG = Noise Gain
External Compensation
See Figure 8
1
0
–1
–2
–3
–4
–5
–6
–7
–8
–9
LOW GAIN INVERTING BANDWIDTH
Frequency (MHz)
Normalized Gain (1dB)
1 10 100 1000
G = –8
G = –4
G = –2
G = –1
V
O
= 0.2V
PP
R
F
= 750Ω
External Compensation
See Figure 6
100
10
1
RECOMMENDED R
S
vs CAPACITIVE LOAD
Capacitive Load (pF)
R
S
(Ω)
1 10 100 1000
G = +20V/V
29
26
23
20
17
14
FREQUENCY RESPONSE vs CAPACITIVE LOAD
Frequency (MHz)
Normalized Gain to Capacitive Load (dB)
1 10 100 1000
C = 22pF
C = 47pF
C = 100pF
C = 10pF
R
S
adjusted for capacitive load.
750Ω
R
S
OPA847
V
I
V
O
50Ω
1kΩ
C
L
39.2Ω
(1kΩ is optional.)