THS4541_15 Datasheet, PDF (11/61 Pages) Texas Instruments – THS4541 Negative Rail Input, Rail-to-Rail Output, Precision, 850-MHz Fully Differential Amplifier

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THS4541
SLOS375A – AUGUST 2014 – REVISED SEPTEMBER 2014
7.7 Typical Characteristics: 5-V Single Supply
At Vs+ = 5 V, Vs– = GND, Vocm is open, 50-Ω single-ended input to differential output, gain = 2 V/V, Rload = 500 Ω, and T_A
≈ 25°C (unless otherwise noted).
9
G=0.1
G=1
6
G=2
G=5
G=10
3
0
-3
-6
-9
1
10
100
1000
Frequency (MHz)
D001
Rf = 402 Ω, see Figure 61 and Table 6 for resistor values
9
6
3
0
-3
-6
-9
-12
10
Vo=100 mVpp
Vo=500 mVpp
Vo=1 Vpp
Vo=2 Vpp
Vo=5 Vpp
100
Frequency (MHz)
See Figure 61
1000
D002
Figure 1. Small-Signal Frequency Response vs Gain
9
Vocm=1.0 V
Vocm=1.5 V
8
Vocm=2.0 V
Vocm=2.5 V
Vocm=3.0 V
7
Vocm=3.5 V
6
5
4
3
10
100
1000
Frequency (MHz)
D003
Vout = 100 mV_PP , see Figure 61 with Vocm adjusted
Figure 2. Frequency Response vs Vopp
9
RL=50 :
RL=100 :
8
RL=200 :
RL=500 :
7
RL=1000 :
6
5
4
3
10
100
1000
Frequency (MHz)
D004
Vout = 100 mV_PP, see Figure 61 with RL adjusted
Figure 3. Small-Signal Frequency Response vs Vocm
9
Cload=10 pF, Ro = 24.9 :
Cload=22 pF, Ro = 16 :
8
Cload=51 pF, Ro = 9.1 :
Cload=100 pF, Ro = 5.4 :
7
6
5
4
3
10
100
1000
Frequency (MHz)
D005
100 mV_PP at load, Av = 2 (see Figure 71), two series Ro added at
output before Cload
Figure 5. Small-Signal Frequency Response vs Cload
Figure 4. Small-Signal Frequency Response vs Rload (RL)
40
Av=2
35
Av=4
Av=10
30
25
20
15
10
5
0
1
10
100
Cload (pF)
D006
Ro is two series output resistors to a differential Cload in parallel
with 500 Ω, see Figure 71 and Table 6
Figure 6. Recommended Ro vs Cload
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