Optimizing LMH6554 to Drive High Speed ADCs TIDA-00092 (ACTIVE)

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Description

This reference design shows the ability of the high-speed amplifier, LMH6554, 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 LMH6554 driving ADS4449
    • SFDR > 82 dBFs, SNR > 71 dBFS in first Nyquist zone
    • SFDR > 80 dBFs, SNR > 68 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 (9)

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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
CSD17313Q2  30V, N ch NexFET MOSFET™, single SON2x2, 32mOhm  MOSFETs  Sample & Buy View Design Kits & Evaluation Modules
LMH6554  2.8 GHz Ultra Linear Fully Differential Amplifier  Special function amplifiers  Sample & Buy View Design Kits & Evaluation Modules
LMH6881  2.4GHz Programmable Differential Amplifier with Gain Control  RF & microwave  Sample & Buy View Design Kits & Evaluation Modules
THS4509  1.9-GHz, Wideband, Low-Noise, Low-Distortion, Fully-Differential Amplifier  Special function amplifiers  Sample & Buy View Design Kits & Evaluation Modules
THS770006  High-Speed Fully Differential ADC Driver Amplifier with +6dB Fixed Gain  Special function amplifiers  Sample & Buy View Design Kits & Evaluation Modules
TPS2400  5.5V overvoltage protection controller with 100V input transient protection  Power switches  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
TPS7A80  Low-Noise, High-Bandwidth PSRR, 1A Low-Dropout (LDO) Linear Regulator  Power management  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
CSD17313Q2 WSON (DQK)| 6 Download -
LMH6554 Download Download
LMH6881 Download Download
THS4509 Download Download
THS770006 Download Download
TPS2400 Download Download
TPS62420 Download Download
TPS7A80 Download

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Technical Documents

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User guides (1)
Title Type Size (KB) Date
PDF 595 24 Mar 2014
Design files (2)
Title Type Size (KB) Date
PDF 184 08 May 2014
PDF 131 08 May 2014
Related Tools & Software

Software (2)



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