THS4521 datasheet(32/54 Pages) TI1

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VS+

THS4531

VS±

VOUT+

VOUT±

VIN+

VIN±

Differential

Input

Differential

Output

VS+

THS4531

VS–

VOUT+

VOUT–

VIN+

–

Single-Ended

Input

Differential

Output

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.

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.

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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