AD4134 datasheet(62/92 Pages) AD

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Data Sheet

AD4134

APPLICATIONS INFORMATION

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Rev. 0 | 62 of 92

Figure 104. Fully Differential Amplifier with Single Supply

Single-Ended or Pseudo Differential Input with

High Source Impedance

The single-ended or pseudo differential input signals must be con-

verted into fully differential signals before driving into the AD4134.

All the circuit examples given in the Front-End Design Examples

section for interfacing with differential signals can work with interfac-

ing with single-ended or pseudo differential signals. Connect the

second input to signal ground or a common-mode voltage source.

A number of other circuits can be used to perform single-ended to

differential conversions.

Instrumentation Amplifier with Fully

Differential Output

The typical application diagram (see Figure 94) shows the wide-

band programmable gain amplifier, LTC6373, connected to the

AD4134. The circuit configuration in Figure 94 is suitable for single-

ended input signals, high common-mode range, and very low input

current offering programmable gain.

Instrumentation Amplifier with Single-Ended to

Differential Output Conversion

The circuit configuration in Figure 105 is suitable for single-ended

input signal, high common-mode range, and low input current

suitable for a high impedance source for gain ≥ 1.

Figure 105. Instrumentation Amplifier in Differential Output Configuration

Precision Dual Amplifier

The circuit in Figure 106 is suitable for a high impedance source,

which can add gain or attenuation. Example operational amplifiers

are the ADA4941-1, LT6350, ADA4805-2, and ADA4075-2.

Figure 106. Dual Operation Amplifier Configuration

Operational Amplifier and Fully Differential

Amplifier

The circuit in Figure 107 is a low input bias operational amplifier

with a fully differential amplifier, like the ADA4945-1, is suitable for

high impedance sources. The fully differential amplifier circuit can

add gain or attenuation.

Figure 107. Op Amp and Fully Differential Amplifier

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