Datasheet

OPA843
6
SBOS268C
www.ti.com
TYPICAL CHARACTERISTICS: V
S
= ±5V (Cont.)
T
A
= +25°C, G = +5, R
F
= 402Ω, R
G
= 100Ω, and R
L
= 100Ω, unless otherwise noted.
INPUT VOLTAGE AND CURRENT NOISE DENSITY
Frequency (Hz)
10
2
10
4
10
5
10
6
10
3
10
7
Voltage Noise nV/√Hz
Current Noise pA/√Hz
10
1
Voltage Noise
Current Noise
2.0nV/√Hz
2.8pA/√Hz
2-TONE, 3RD-ORDER
INTERMODULATION INTERCEPT
Frequency (MHz)
10 15 20 25 30 35 40 45 50 55 60 65 70
Intercept Point (+dBm)
55
50
45
40
35
30
25
G = +5
OPA843
50Ω
50Ω
50Ω
402Ω
100Ω
P
O
P
I
NONINVERTING GAIN FLATNESS TUNE
Frequency (MHz)
1 10010 1k
Deviation from 12dB Gain (0.1dB/div)
0.40
0.30
0.20
0.10
0
–0.10
–0.20
–0.30
–0.40
V
O
= 200mVp-p
A
V
= +4
NG = 4.5
NG = 4
NG = 5.5
NG = 5
External Compensation
See Figure 10
LOW GAIN INVERTING BANDWIDTH
Frequency (MHz)
1 10010 1k
Normalized Gain (1dB/div)
3
2
1
0
–1
–2
–3
–4
–5
–6
V
O
= 200mVp-p
G = –2
G = –1
G = –3
External Compensation
See Figure 11
RECOMMENDED R
S
vs CAPACITIVE LOAD
Capacitive Load (pF)
1 10 100 1k
R
S
(Ω)
100
10
1
G = +5
FREQUENCY RESPONSE vs CAPACITIVE LOAD
Frequency (Hz)
10
6
10
8
10
7
10
9
Normalized Gain to Capacitive Load (dB)
17
14
11
8
5
2
R
S
adjusted to cap load.
C = 10pF
C = 22pF
OPA843
R
S
50Ω
1kΩC
L
402Ω
100Ω
V
O
V
I
1kΩ is optional.
C = 100pF
C = 47pF