TYPICAL PERFORMANCE CURVES: VS = +5V (CONT)
G = +2, RF = 499Ω, and RL = 100Ω to +2.5V, unless otherwise noted (see Figure 2).
3RD HARMONIC DISTORTION vs FREQUENCY
2ND HARMONIC DISTORTION vs FREQUENCY
–40
–50
–60
–70
–80
–40
–50
–60
–70
–80
VO = 2Vp-p
RL = 100Ω to 2.5V
VO = 2Vp-p
RL = 100Ω to 2.5V
G = +10, RF = 200Ω
G = +10, RF = 200Ω
G = +5, RF = 360Ω
G = +5, RF = 360Ω
G = +2, RF = 499Ω
G = +2, RF = 499Ω
10 20
0.1
1
0.1
1
10
20
Frequency (MHz)
Frequency (MHz)
3RD HARMONIC DISTORTION vs FREQUENCY
2ND HARMONIC DISTORTION vs FREQUENCY
–50
–60
–70
–80
–90
–50
–60
–70
–80
–90
VO = 2Vp-p
G = +2
VO = 2Vp-p
G = +2
RL = 100Ω
RL = 200Ω
RL = 100Ω
RL = 200Ω
RL = 500Ω
RL = 500Ω
Loads to 2.5V
0.1
Loads to 2.5V
0.1
1
10
20
1
10
20
Frequency (MHz)
Frequency (MHz)
TWO-TONE, 3RD ORDER SPURIOUS LEVEL
dBc = dB below carriers
CLOSED-LOOP OUTPUT IMPEDANCE
+5
–45
–50
–55
–60
–65
–70
–75
–80
–85
10
1
50MHz
OPA681
50Ω
ZO
402Ω
20MHz
402Ω
–5
0.1
0.01
10MHz
Load Power at Matched 50Ω Load
–14
–12
–10
–8
–6
–4
–2
0
2
10k
100k
1M
10M
100M
Single-Tone Load Power (dBm)
Frequency (Hz)
®
10
OPA681
BB [ BURR-BROWN CORPORATION ]
