Optimizing THS4509 to Drive High Speed ADCs Reference Design


Design files


This reference design shows the ability of the high-speed amplifier, THS4509 to perform single-ended to differential conversion to drive high-speed analog-to-digital converters (ADCs) while maintaining excellent noise and distortion performance. Performance versus input frequency is shown for both AC and DC coupled applications while interfaced to the ADS4449 quad, 250-MSPS, 14-bit ADC. Various options for common-mode voltages, power supplies, and interfaces are discussed and measured to meet the requirements of a variety of applications. Anti-aliasing filter examples are shown along with the performance improvements that they provide.

  • High-speed single-ended to differential conversion while maintain excellent performance
  • System performance results for THS4509 driving ADS4449
    - SFDR > 77 dBFs, SNR > 71 dBFS in first Nyquist zone
    - SFDR > 69 dBFs, SNR > 67 dBFS in second Nyquist zone
  • Examples of both AC and DC coupled interfaces
  • Demonstrates anti-aliasing filter design and performance gains
  • Amplifier power supply design considerations for best performance are discussed
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A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDU173.PDF (605 K)

Reference design overview and verified performance test data

TIDC763.ZIP (1598 K)

Detailed schematic diagram for design layout and components


Detailed schematic diagram for design layout and components


Complete listing of design components, reference designators, and manufacturers/part numbers


Includes TI products in the design and potential alternatives.

High-speed ADCs (≥10 MSPS)

ADS4449Quad-Channel, 14-Bit, 250-MSPS Analog-to-Digital Converter (ADC)

Data sheet: PDF | HTML
Buck converters (integrated switch)

TPS62420Dual, Adjustable, 600mA and 1000mA, 2.25MHz Step-Down Converter with 1-Wire Interface in QFN

Data sheet: PDF | HTML
Fully differential amplifiers

LMH65542.8 GHz Ultra Linear Fully Differential Amplifier

Data sheet: PDF | HTML
Fully differential amplifiers

THS45091.9-GHz, Wideband, Low-Noise, Low-Distortion, Fully-Differential Amplifier

Data sheet: PDF | HTML
Fully differential amplifiers

THS770006High-Speed Fully Differential ADC Driver Amplifier with +6dB Fixed Gain

Data sheet: PDF
Linear & low-dropout (LDO) regulators

TPS7A801-A, high-PSRR, ultra-low-dropout voltage regulator with low-IQ & enable

Data sheet: PDF | HTML

LMH68812.4GHz Programmable Differential Amplifier with Gain Control

Data sheet: PDF | HTML
eFuses & hot swap controllers

TPS24005.5-V over voltage protection controller with 100-V input transient protection

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
Design guide Optimizing the THS4509 to Drive High-Speed ADCs Design Guide Mar. 24, 2014

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