THS4541 Datasheet, PDF (17/62 Pages) Texas Instruments – Fully Differential Amplifier

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THS4541
SLOS375 – AUGUST 2014
7.9 Typical Characteristics: 3-V to 5-V Supply Range
At Vs+ = 3 V and 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).
130
0
10
Aol Gain
Gain=2, +3 V
Aol Phase
Gain=2, +5 V
100
-50
1
Gain=5, +3 V
Gain=5, +5 V
70
-100
0.1
40
-150
0.01
10
-200
0.001
-20
-250
100 1k 10k 100k 1M 10M 100M 1G
Frequency (Hz)
D037
Figure 37. Main Amplifier Differential Open-Loop Gain and
Phase vs Frequency
50
+5 V En
+5 V In
+3 V En
+3 V In
10
0.0001
1k
10k
100k
1M
10M
100M
Frequency (Hz)
D038
Single-ended input to differential output, simulated differential
output impedance, (closed-loop) gain of 2 and 5, see Figure 61
Figure 38. Closed-Loop Output Impedance
-50
+3 V supply
+5 V supply
-55
-60
-65
-70
-75
1
1k
10k
100k
1M
10M
Frequency (Hz)
D039
Figure 39. Input Spot Noise Over Frequency
110
100
90
80
70
60
50
1k
10k
100k
1M
10M
100M
Frequency (Hz)
D041
Common-mode in to differential out, gain of 2 simulation
Figure 41. CMRR Over Frequency
-80
1k
10k
100k
1M
10M
100M
Frequency (Hz)
D040
Single-ended input to differential output, gain of 2 (see Figure 61),
simulated with 1% resistor, worst-case mismatch
Figure 40. Output Balance Error Over Frequency
90
+3 V +Vs
85
+5 V +Vs
80
+3 V -Vs
+5 V -Vs
75
70
65
60
55
50
45
40
10k
100k
1M
10M
100M
Frequency (Hz)
D042
Single-ended to differential, gain of 2 (see Figure 61) PSRR
simulated to differential output
Figure 42. PSRR Over Frequency
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