Datasheet

V
OUT+
R
G
R
G
V
IN–
V
IN+
0.22 μF
R
F
R
F
R
O
R
O
R
OT
R
IT
R
IT
No Connection
V
OUT–
V
S+
THS4531
V
S–
Measure With
Diff Probe
No Connection
Power
Supply
Network
Analyzer
Cal Diff Probe
+
–
V
OCM
V
OUT+
R
G
R
G
V
IN±
V
IN+
R
F
R
F
R
O
R
O
R
IT
R
IT
No Connection
V
OUT±
V
S+
THS4531
V
S±
For BW
Measure With
Diff Probe Here
No Connection
Cal Diff Probe
49.9 
V
OCM
From Network
Analyzer
R
CM
For Z
IN
Measure With
Diff Probe Here
NC
+
-
V
OCM
THS4531
SLOS358B –SEPTEMBER 2011–REVISED MARCH 2012 www.ti.com
Figure 71. PSRR Test Circuit
V
OCM
Input
The circuit shown in Figure 72 is used to measure the transient response, frequency response and input
impedance of the V
OCM
input. For these tests, the cal point is across the 49.9Ω V
OCM
termination resistor.
Transient response and frequency response are measured with R
CM
= 0Ω and using a high impedance
differential probe at the summing junction of the two R
O
resistors, with respect to ground. The input impedance is
measured using a high impedance differential probe at the V
OCM
pin and the drop across R
CM
is used to calculate
the impedance seen looking into the amplifier’s V
OCM
input.
Figure 72. V
OCM
Input Test Circuit
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