THS4511-SP Datasheet, PDF (14/25 Pages) Texas Instruments – RAD-TOLERANT CLASS V, WIDEBAND, FULLY DIFFERENTIAL AMPLIFIER

THS4511–SP
SLOS538A – SEPTEMBER 2007 – REVISED OCTOBER 2007
and Turn-On/Off Time
The circuit shown in Figure 32 is used to measure
slew rate, transient response, settling time, output
impedance, overdrive recovery, output voltage swing,
and turn-on/turn-off times of the amplifier. For output
impedance, the signal is injected at V_OUT with V_IN left
open, and the drop across the 49.9 Ω resistor is used
to calculate the impedance seen looking into the
amplifier’s output.
From ^VIN
50 W
Source
RG
R IT
0.22 mF
49.9 W
RG
R IT
RF
5V
THS4511
CM
RF
49.9 W
49.9 W
Open
0.22 mF
V_OUT+
V_OUT-
To 50 W
Test
Equipment
Figure 32. SR, Transient Response, Settling Time,
Z_O, Overdrive Recovery, V_OUT Swing, and
Turn-on/off Test Circuit
CM Input
The circuit shown in Figure 33 is used to measure the
frequency response and input impedance of the CM
input. Frequency response is measured single-ended
at V_OUT+ or V_OUT– with the input injected at V_IN, R_CM =
0 Ω and R_CMT = 49.9 Ω. The input impedance is
measured with R_CM = 49.9 Ω with R_CMT = open, and
calculated by measuring the voltage drop across R_CM
to determine the input current.
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0.22 mF
49.9 W
0.22 mF
49.9 W
RG
RIT
RG
RIT
RF
5V
THS4511
CM
RF
49.9 W
49.9 W
RCM
RCMT
VOUT–
To
50
W
Test
VOUT+ _Equipment
VIN From
50 W
source
Figure 33. CM Input Test Circuit
CMRR and PSRR
The circuit shown in Figure 34 is used to measure the
CMRR and PSRR of V_S+ and V_S–. The input is
switched appropriately to match the test being
performed.
V_S+
348 W
PSRR+
From ^VIN
50 W
Source
CMRR
PSRR-
V_S-
5V
100 W
100 W
THS4511
CM
69.8 W
49.9 W
49.9 W ^{100 W}
Open
0.22 mF
Output
Measured
Here
With High-
Impedance
Differential
Probe
348 W
Figure 34. CMRR and PSRR Test Circuit
14
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