THS4541IRUNR.B datasheet(45/66 Pages) TI2

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9 Application and Implementation

Note

Information in the following applications sections is not part of the TI component specification,

and TI does not warrant its accuracy or completeness. TI’s customers are responsible for

determining suitability of components for their purposes, as well as validating and testing their design

implementation to confirm system functionality.

9.1 Application Information

The THS4541 is effective over a broad range of applications. Two examples are developed here. First, an

attenuator stage that directly receives a higher input signal voltage and translates the voltage to a lower

differential swing on a fixed common-mode is shown. This design requires some attention to frequency-response

flatness issues, and one approach to managing these issues is shown. The second example is a gain of 2 V/V,

matched input of 50 Ω to an output set to 0.95 V common-mode followed by a third-order Bessel filter with

approximately 20 MHz of bandwidth feeding into the ADC34J22, a low-power, 12-bit, quad 50-MSPS JESD 204B

ADC.

9.2 Typical Applications

9.2.1 Designing Attenuators

Rf1

402

Rg1

4.02 k

Rg2

4.02 k

THS4541 Wideband,

Fully-Differential Amplifier

Rf2

402

Gain of 0.1 V/V from Rg1,

Single-Ended to Differential,

DC-Coupled, Single Supply

500

Vcc

Vcm

Vcc

5 V

Vcm

2.5 V

VM1

VG1

Vcc

Vocm

Vcc

FDA

Figure 9-1. Divide-by-10 Attenuator Application for the THS4541

9.2.1.1 Design Requirements

In this design, the aim is to:

1. Present a 4-kΩ input impedance to a ±40-V input signal (maximum ±10 mA from the prior stage).

2. Attenuate that swing by a factor 1/10 (–20 dB) to a differential output swing.

3. Place that swing on a 2.5-V common-mode voltage at the THS4541 outputs.

4. Operate on a single +5-V supply and ground.

5. Tune the frequency response to a flat Butterworth response with external capacitors.

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THS4541

SLOS375B – AUGUST 2014 – REVISED FEBRUARY 2024

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