THS4521 Datasheet, PDF (15/43 Pages) Texas Instruments – VERY LOW POWER, NEGATIVE RAIL INPUT, RAIL-TO-RAIL OUTPUT, FULLY DIFFERENTIAL AMPLIFIER

THS4521
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THS4524
www.ti.com.................................................................................................................................................... SBOS458B – DECEMBER 2008 – REVISED MAY 2009
TYPICAL CHARACTERISTICS: V_S+ – V_S– = 3.3 V (continued)
At V_S+ = +3.3 V, V_S– = 0 V, V_OCM = open, V_OUT = 2 V_PP (differential), R_L = 1 kΩ differential, G = 1 V/V, single-ended input,
differential output, and input and output referenced to midsupply, unless otherwise noted.
TURN-ON TIME
4.0
2.5
V_S+ = 3.3 V
3.5 G = 1 V/V
R_F = 1 kW
2.0
3.0 _{RL = 200 W}
2.5
1.5
2.0
1.5
1.0
1.0
V_OUT Diff
PD
0.5
0.5
0
0
0 20 40 60 80 100 120 140 160 180 200
Time (ns)
Figure 19.
INPUT-REFERRED VOLTAGE AND CURRENT NOISE
SPECTRAL DENSITY
100
10
Voltage
Noise
Current
1
Noise
0
10
100
1k
10 k
100 k
1M
Frequency (Hz)
Figure 21.
OUTPUT BALANCE ERROR
vs FREQUENCY
-20
G = 0 dB
-25
-30
-35
-40
-45
-50
-55
-60
100 k
1M
10 M
Frequency (Hz)
Figure 23.
100 M
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
0
TURN-OFF TIME
2.0
V_S+ = 3.3 V
G = 1 V/V
1.8
R_F = 1 kW 1.6
R_L = 200 W _1.4
1.2
1.0
0.8
0.6
V_OUT Diff
0.4
PD
0.2
0
20 40 60 80 100 120 140 160 180 200
Time (ns)
Figure 20.
MAIN AMPLIFIER
DIFFERENTIAL OPEN-LOOP GAIN AND PHASE
120
0
Gain
100
80
-45
60
40
20
0
-20
1
-90
Phase
-135
10 100 1 k 10 k 100 k 1 M 10 M 100 M
Frequency (Hz)
Figure 22.
V_OCM SMALL-SIGNAL FREQUENCY RESPONSE
0
-5
-10
-15
G = 0 dB
V_IN = -20 dBm
-20
100 k
1M
10 M
100 M
1G
Frequency (Hz)
Figure 24.
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