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TIDA-00092
Optimizing LMH6554 to Drive High Speed ADCs
TIDA-00092
Overview
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
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.
TIDU172.PDF (595 K)
Reference design overview and verified performance test data
TIDC419.ZIP (1671 K)
Detailed schematic diagram for design layout and components
TIDR604.PDF (131 K)
Detailed schematic diagram for design layout and components
TIDR605.PDF (184 K)
Complete listing of design components, reference designators, and manufacturers/part numbers
Products
Includes TI products in the design and potential alternatives.
MOSFETs
CSD17313Q2 — 30-V, N channel NexFET™ power MOSFET, single SON 2 mm x 2 mm, 32 mOhm
Data sheet: PDF | HTMLStart development
Technical documentation
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| Type | Title | Date | ||
|---|---|---|---|---|
| Design guide | Optimizing the LMH6554 to Drive High-Speed ADCs Design Guide | Mar. 24, 2014 |
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