THS4524MDBTREP datasheet(27/48 Pages) NSC

27 / 48 page

OUT+

R +R

IN- ´

R +R

THS452x

OUT-

IN-

OUT+

IN+

Differential

Input

Differential

Output

S+

S-

THS452x

OUT-

OUT+

Single-Ended

Input

Differential

Output

S+

S-

THS4524-EP

www.ti.com

SBOS609A – JUNE 2012 – REVISED AUGUST 2013

APPLICATION INFORMATION

The following circuits show application information for

the

THS4524.

For

simplicity,

power-supply

decoupling

capacitors

are

not

shown

these

diagrams;

see

the

EVM

and

Layout

Recommendations section for suggested guidelines.

For more details on the use and operation of fully

differential op amps, refer to the Application Report

Fully-Differential Amplifiers (SLOA054), available for

download from the TI web site at www.ti.com.

Differential Input to Differential Output

Amplifier

The

THS4524

fully-differential

operational

amplifier that can be used to amplify differential input

signals to differential output signals. Figure 61 shows

Figure 62. Single-Ended Input to Differential

a basic block diagram of the circuit (VOCM and PD

Output Amplifier

inputs not shown). The gain of the circuit is set by RF

divided by RG.

Input Common-Mode Voltage Range

The input common-mode voltage of a fully-differential

op amp is the voltage at the + and – input pins of the

device.

It is important to not violate the input common-mode

voltage range (VICR) of the op amp. Assuming the op

amp is in linear operation, the voltage across the

input pins is only a few millivolts at most. Therefore,

finding the voltage at one input pin determines the

input common-mode voltage of the op amp.

Treating the negative input as a summing node, the

voltage is given by Equation 1:

Figure 61. Differential Input to Differential Output

Amplifier

(1)

To determine the VICR of the op amp, the voltage at

Single-Ended Input to Differential Output

the negative input is evaluated at the extremes of

Amplifier

VOUT+. As the gain of the op amp increases, the input

The THS4524 can also amplify and convert single-

common-mode voltage becomes closer and closer to

ended input signals to differential output signals.

the input common-mode voltage of the source.

Figure 62 illustrates a basic block diagram of the

circuit (VOCM and PD inputs not shown). The gain of

Setting the Output Common-Mode Voltage

the circuit is again set by RF divided by RG.

The output common-model voltage is set by the

voltage at the VOCM pin. The internal common-mode

control circuit maintains the output common-mode

voltage within 5-mV offset (typ) from the set voltage.

If left unconnected, the common-mode set point is set

to midsupply by internal circuitry, which may be

overdriven from an external source.

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