Optimizing THS4509 to Drive High Speed ADCs Reference Design

(ACTIVE) TIDA-00093

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Description

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.

Features
  • 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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TI Devices (8)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
ADS4449  Quad-Channel, 14-Bit, 250-MSPS Analog-to-Digital Converter (ADC)  Analog-to-Digital Converters (ADCs)  Sample & Buy View Design Kits & Evaluation Modules
LMH6554  2.8 GHz Ultra Linear Fully Differential Amplifier  Operational Amplifiers (Op Amps)  Sample & Buy View Design Kits & Evaluation Modules
LMH6881  2.4GHz Programmable Differential Amplifier with Gain Control  Amplifiers  Sample & Buy View Design Kits & Evaluation Modules
THS4509  Wideband Operational Amplifier  Operational Amplifiers (Op Amps)  Sample & Buy View Design Kits & Evaluation Modules
THS770006  High-Speed Fully Differential ADC Driver Amplifier with +6dB Fixed Gain  Operational Amplifiers (Op Amps)  Sample & Buy View Design Kits & Evaluation Modules
TPS2400  Overvoltage/Undervoltage Protection IC in SOT-23-5  Protection, Monitoring and Hot Swap  Sample & Buy View Design Kits & Evaluation Modules
TPS62420  Dual, Adjustable, 600mA and 1000mA, 2.25MHz Step-Down Converter with 1-Wire Interface in QFN   Step-Down (Buck)  Sample & Buy View Design Kits & Evaluation Modules
TPS7A8001  Low-Noise, High-Bandwidth PSRR, 1A Low-Dropout Linear Regulator  Linear Regulator (LDO)  Sample & Buy View Design Kits & Evaluation Modules

Technical Documents

View the Important Notice for TI Designs covering authorized use, intellectual property matters and disclaimers.

User guides (1)
Title Abstract Type Size (KB) Date Views
PDF 605 24 Mar 2014 247
Design files (2)
Title Abstract Type Size (KB) Date Views
PDF 276 17 Nov 2014 28
PDF 138 17 Nov 2014 112
Related Tools & Software

Software (1)




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