THS4531
SLOS358B –SEPTEMBER 2011–REVISED MARCH 2012
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APPLICATION CIRCUITS
The following circuits show application information for the THS4531. For simplicity, power supply decoupling
capacitors are not shown in these diagrams – please see the EVM and Layout Recommendations section for
recommendations. For more detail on the use and operation of fully differential op amps refer to application
report “Fully-Differential Amplifiers” SLOA054D.
Differential Input to Differential Output Amplifier
The THS4531 is a fully differential op amp and can be used to amplify differential input signals to differential
output signals. A basic block diagram of the circuit is shown in Figure 74 (VOCM and PD inputs not shown). The
gain of the circuit is set by RF divided by RG.
RG
RF
VIN+
VOUTœ
Differential
Input
Differential
Output
VS+
+
THS4531
œ
VSœ
RF
RG
VINœ
VOUT+
Figure 74. Differential Input to Differential Output Amplifier
Single-Ended Input to Differential Output Amplifier
The THS4531 can also be used to amplify and convert single-ended input signals to differential output signals. A
basic block diagram of the circuit is shown in Figure 75 (VOCM and PD inputs not shown). The gain of the circuit
is again set by RF divided by RG.
RG
RF
VIN+
VOUT–
Single-Ended
Input
Differential
Output
VS+
+
THS4531
–
VS–
RF
RG
VOUT+
Figure 75. Single-Ended Input to Differential Output Amplifier
Differential Input to Single-Ended Output Amplifier
Fully differential op amps like the THS4531 are not recommended for differential to single-ended conversion.
This application is best performed with an instrumentation amplifier or with a standard op amp configured as a
classic differential amplifier. See application section of the OPA835 data sheet (SLOS713).
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