THS4521 Datasheet, PDF (14/43 Pages) Texas Instruments – VERY LOW POWER, NEGATIVE RAIL INPUT, RAIL-TO-RAIL OUTPUT, FULLY DIFFERENTIAL AMPLIFIER

THS4521
THS4522
THS4524
SBOS458B – DECEMBER 2008 – REVISED MAY 2009.................................................................................................................................................... www.ti.com
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.
SINGLE-ENDED OUTPUT VOLTAGE SWING
vs LOAD RESISTANCE
3.5
Linear Voltage Range
3.0 ^{VOCM = 1.65 V}
2.5
2.0
V_OUT max
1.5
V_OUT min
1.0
0.5
0
10
100
1k
10 k
Load Resistance (W)
Figure 13.
FREQUENCY RESPONSE vs C_LOAD
R_LOAD = 1 kΩ
5
C_L = 4.7 pF
0
R_O = 150 W
-5
C_L = 1000 pF
R_O = 7.15 W
-10
C_L = 100 pF
R_O = 35.7 W
-15
-20
C_L = 10 pF
R_O = 124 W
-25
100 k
1M
10 M
100 M
1G
Frequency (Hz)
Figure 15.
REJECTION RATIO vs FREQUENCY
110
100
90
80
70
60 ^{VS+ = 3.3 V}
G = 1 V/V
R_F = 1 kW
50
10 k
100 k
-PSRR
1M
Frequency (Hz)
Figure 17.
CMRR
+PSRR
10 M
100 M
MAIN AMPLIFIER DIFFERENTIAL OUTPUT IMPEDANCE
vs FREQUENCY
100
10
1
0.1
0.01
100 k
1k
1M
10 M
Frequency (Hz)
Figure 14.
R_O vs C_LOAD
R_LOAD = 1 kΩ
100 M
100
10
1
10
100
1000
C_LOAD (pF)
Figure 16.
-100
-105
-110
-115
THS4522, THS4524
CROSSTALK (MEASURED DIFFERENTIALLY)
V_S+ = 3.3 V
G = 1 V/V
R_F = 1 kW
R_L = 1 kW
Active Channel V_OUT = 1 V_RMS
-120
-125
-130
-135
-140
10
100
1k
10 k
100 k
1M
Frequency (Hz)
Figure 18.
14
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