THS4531 Datasheet, PDF (29/54 Pages) Texas Instruments – Ultra Low Power, Rail-to-Rail Output, Fully-Differential Amplifier

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V_IN+
Input From 50-Ω
Test Equipment
R_G
PD
R_IT
0.22 μF
V_IN–
No Connection
Installed to Balance
Amplifier
0.22 μF
49.9 Ω
0.22 μF
R_G
R_IT
THS4531
SLOS358B – SEPTEMBER 2011 – REVISED MARCH 2012
R_F
R_O
V_S+
+
V_OCM
–
THS4531
V_S–
R_O
R_F
V_OUT–
Output to
Test Equipment
V_OUT+
Output to
Test Equipment
Figure 69. Slew Rate, Transient Response, Settling Time, Z_O, Overdrive Recovery, V_OUT Swing, and Turn-
on/off Test Circuit
Common-Mode and Power Supply Rejection
The circuit shown in Figure 70 is used to measure the CMRR. The signal from the network analyzer is applied
common-mode to the input.
V_IN+
Input From 50-Ω
Test Equipment
V_IN–
No Connection
R_G
R_F
R_O
0.22 μF
R_G
V_S+
+
V_OCM
–
V_S–
V_OUT–
THS4531
V_OUT+
R_O
R_OT
R_F
R_IT
Cal Diff Probe
Measure With
Diff Probe
Figure 70. CMRR Test Circuit
Figure 71 is used to measure the PSRR of V_S+ and V_S-. The power supply is applied to the network analyzer’s
DC offset input. For both CMRR and PSRR, the output is probed using a high impedance differential probe
across R_OT.
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