THS4541 Datasheet, PDF (18/62 Pages) Texas Instruments – Fully Differential Amplifier

THS4541
SLOS375 – AUGUST 2014
www.ti.com
Typical Characteristics: 3-V to 5-V Supply Range (continued)
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).
1
3
+5 V, 100 mVpp
0.5
0
+5 V, 1 Vpp
2.75
+3 V, 100 mVpp
5 V Large Signal
+3 V, 1 Vpp
2.5
-0.5
-1
2.25
5 V Small Signal
-1.5
2
-2
1.75
3 V Large Signal
-2.5
1.5
-3
-3.5
1.25
3 V Small Signal
-4
1
1
10
100
1000
25 35 45 55 65 75 85 95
Frequency (MHz)
D043
Time (ns)
D044
Figure 43. Common-Mode, Small- and Large-Signal
Response (Vocm pin driven)
1000
+5 V Vocm driven
+5 V Vocm floating
+3 V Vocm driven
+3 V Vocm floating
100
10
1
100
1k
10k
100k
1M
10M
Frequency (Hz)
D045
Vocm input either driven to midsupply by low impedance source,
or allowed to float and default to midsupply
Figure 44. Common-Mode, Small- and Large-Step Response
(Vocm pin driven)
10
+5 V supply
8
+3 V supply
6
4
2
0
-2
-4
-6
-8
-10
0.8 1.2 1.6 2 2.4 2.8 3.2 3.6 4
Vocm Input Voltage (V)
D046
Average Vocm output offset of 37 units,
Standard deviation < 2.5 mV, see Figure 63
Figure 45. Output Common-Mode Noise
100
+3 V supply
+5 V supply
95
90
85
80
75
70
0.85 1.35 1.85 2.35 2.85 3.35 3.85
Vocm (V)
D047
Single-ended to differential gain of 2 (see Figure 61), PSRR for
negative supply to differential output (1-kHz simulation)
Figure 47. –PSRR vs Vocm Approaching Vs–
Figure 46. Vocm Offset vs Vocm Setting
100
95
90
85
80
75
+3 V supply
+5 V supply
70
0.85 1.35 1.85 2.35 2.85 3.35 3.85
Vocm (V)
D048
Single-ended to differential gain of 2 (see Figure 61), PSRR for
positive supply to differential output (1-kHz simulation)
Figure 48. +PSRR vs Vocm Approaching Vs+
18
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