TYPICAL PERFORMANCE CURVES: VS = ±5V (CONT)
G = +2, RF = 402Ω, and RL = 100Ω, unless otherwise noted (see Figure 1).
2ND HARMONIC DISTORTION vs FREQUENCY
3RD HARMONIC DISTORTION vs FREQUENCY
–40
–50
–60
–70
–80
–90
–40
–50
–60
–70
–80
–90
VO = 2Vp-p
RL = 100Ω
VO = 2Vp-p
RL = 100Ω
G = +10, RF = 180Ω
G = +10, RF = 180Ω
G = +5, RF = 261Ω
G = +5, RF = 261Ω
G = +2, RF = 402Ω
G = +2,
RF = 402Ω
0.1
1
10
20
0.1
1
10
20
Frequency (MHz)
Frequency (MHz)
TWO-TONE, 3RD-ORDER
INPUT VOLTAGE AND CURRENT NOISE DENSITY
INTERMODULATION SPURIOUS
100
10
1
–40
–45
–50
–55
–60
–65
–70
–75
–80
–85
–90
dBc = dB below carriers
50MHz
Inverting Input Current Noise
15.1pA/√Hz
12.2pA/√Hz
Non-Inverting Input Current Noise
20MHz
10MHz
2.2nV/√Hz
1M
Voltage Noise
Load Power at Matched 50Ω Load
100
1k
10k
100k
10M
–8
–6
–4
–2
0
2
4
6
8
10
Frequency (Hz)
Single-Tone Load Power (dBm)
RECOMMENDED RS vs CAPACITIVE LOAD
FREQUENCY RESPONSE vs CAPACITIVE LOAD
CL = 10pF
60
50
40
30
20
10
0
15
12
9
CL = 22pF
6
3
CL = 47pF
0
–3
–6
–9
–12
–15
VIN
RS
VO
OPA681
402Ω
CL
1kΩ
402Ω
1kΩ is optional.
CL = 100pF
1
10
100
0
150MHz
300MHz
Capacitive Load (pF)
Frequency (30MHz/div)
®
7
OPA681
BB [ BURR-BROWN CORPORATION ]
