THS4513-SP Datasheet, PDF (20/30 Pages) Texas Instruments – RAD-TOLERANT CLASS V, WIDEBAND, FULLY DIFFERENTIAL AMPLIFIER

THS4513-SP
SLOS539A – SEPTEMBER 2007 – REVISED OCTOBER 2007
Slew Rate, Transient Response, Settling Time,
Output Impedance, Overdrive, Output Voltage,
and Turn-On/Off Time
The circuit shown in Figure 57 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 Ω
Source
RG
R IT
0.22 µF
49.9 Ω
RG
R IT
RF
V_S+
THS 4513
CM
V_S−
RF
49.9 Ω
49.9 Ω
Open
0.22 µF
V_OUT+
V_OUT−
To 50 Ω
Test
Equipment
Figure 57. 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 58 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.
www.ti.com
0.22 mF
49.9 W
0.22 mF
49.9 W
RG
RIT
R_G
RIT
RF
V_S+
49.9 W
THS4513 _{49.9 W}
CM
V_S–
R_F
R_CM
R_CMT
V_OUT–
To
50
W
Test
V_{OUT+ Equipment}
VIN From
50 W
source
Figure 58. CM Input Test Circuit
CMRR and PSRR
The circuit shown in Figure 59 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+
PSRR+
From ^VIN
50 Ω
Source
CMRR
PSRR−
V_S−
348 Ω
100 Ω
100 Ω
69.8 Ω
V_S+
THS4513
CM
V_S−
348 Ω
49.9 Ω
49.9 Ω ^{100 Ω}
Open
0.22 µF
Output
Measured
Here
With High
Impedance
Differential
Probe
Figure 59. CMRR and PSRR Test Circuit
20
Submit Documentation Feedback
Product Folder Link(s): THS4513-SP
Copyright © 2007, Texas Instruments Incorporated