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| THS4531A_15 Datasheet, PDF (30/59 Pages) Texas Instruments – THS4531A Ultra Low-Power, Rail-to-Rail Output, Fully Differential Amplifier | |||
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THS4531A
SLOS823B â DECEMBER 2012 â REVISED JUNE 2015
VIN+
No Connection
VIN±
No Connection
Power
Supply
Network
Analyzer
RG
RF
Cal Diff Probe
RO
RIT
0.22 F
RG
RIT
VS+
+
VOCM
±
VS±
VOUT±
THS4531A
VOUT+
RO
ROT
RF
www.ti.com
Measure With
Diff Probe
Figure 73. PSRR Test Circuit
9.1.5 VOCM Input
The circuit shown in Figure 74 is used to measure the transient response, frequency response, and input
impedance of the VOCM input. For these tests, the cal point is across the 49.9 ⦠VOCM termination resistor.
Transient response and frequency response are measured with RCM = 0 ⦠and using a high impedance
differential probe at the summing junction of the two RO resistors, with respect to ground. The input impedance is
measured using a high impedance differential probe at the VOCM pin and the drop across RCM is used to calculate
the impedance into the VOCM input of the amplifier.
VIN+
No Connection
RG
RF
RO
VOCM
From Network
Analyzer
Cal Diff Probe
RIT
RCM
For ZIN
49.9
Measure With
Diff Probe Here
VIN±
RG
No Connection
RIT
NC
VS+
+
VOCM
-
VOUT±
THS4531A
VS±
VOUT+
RO
RF
For BW
Measure With
Diff Probe Here
Figure 74. VOCM Input Test Circuit
30
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