OPA2846_14 Datasheet, PDF (7/30 Pages) Texas Instruments – Dual, Wideband, Low-Noise, Voltage-Feedback Operational Amplifier

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TYPICAL CHARACTERISTICS: V_S = ±5V (continued)
TA = 25°C, G = +10, RF = 453Ω, RG = 50Ω, and RL = 100Ω, unless otherwise noted.
OPA2846
SBOS274C −JUNE 2003 − REVISED AUGUST 2008
INPUT VOLTAGE AND CURRENT NOISE
10
Current Noise
2.8pA/√Hz
Voltage Noise
1.2nV/√Hz
1
10 100 1k 10k 100k 1M 10M 100M
Frequency (Hz)
2−TONE, 3RD−ORDER INTERMODULATION INTERCEPT
50
G = +10V/V
45
50Ω Source
+5V
P _IN
1 /2
50Ω O PA2846
− 5V
R_S
5 0Ω
P_O
R_L
50Ω
40
R_F
453Ω
35
R_G
50Ω
30
25
20
5
10 15 20 25 30 35 40 45 50
Frequency (MHz)
NONINVERTING GAIN FLATNESS TUNE
0.5
V_O = 200mV_PP
0.4 A_V = +8
0.3 ^RF ^{= 453Ω}
0.2 ^{RG = 64.9Ω}
NG = 8.0
NG = 8.5
NG = 9.0
0.1
0
−0.1
−0.2
−0.3
NG = 9.5
NG = 10.0
External Compensation
−0.4 _{See Figure 9}
−0.5
1M
10M
100M
1G
Frequency (Hz)
LOW GAIN INVERTING BANDWIDTH
3
V_O = 200mV_PP
2 _{RF = 400Ω}
1
G = −6
0
G = −4
−1
G = −2
−2
G = −1
−3
−4
−5 ^{External Compensation}
See Figure 5
−6
1M
10M
100M
1G
Frequency (Hz)
RECOMMENDED R_S vs CAPACITIVE LOAD
100
G = +10V/V
10
1
1
10
100
Capacitive Load (pF)
1000
FREQUENCY RESPONSE vs CAPACITIVE LOAD
23
R_S adjusted for capacitive load.
C = 10pF
20
C = 22pF
17
50 Ω So urce
Power− supply
+5V ^{decoupling not show n.}
V _IN
14
11
1/2
50Ω O PA2846
−5V
R
453Ω
R_G
50Ω
R_S
V_O
C_L
R_L
1kΩ
(1kΩ is optional.)
8
1M
10M
100M
Frequency (Hz)
C = 47pF
C = 100pF
1G
7