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TIDA-00092

Optimizing LMH6554 to Drive High Speed ADCs

Design files

TIDA-00092

Design files

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
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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.

download Design guide — TIDA-00092
TIDU172.PDF (595 K)

Reference design overview and verified performance test data

download Schematic — TIDA-00092
TIDC419.ZIP (1671 K)

Detailed schematic diagram for design layout and components

download Schematic — TIDA-00092
TIDR604.PDF (131 K)

Detailed schematic diagram for design layout and components

download Bill of materials (BOM) — TIDA-00092
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.

AC/DC & DC/DC converters (integrated FET)

TPS62420 — Dual, Adjustable, 600mA and 1000mA, 2.25MHz Step-Down Converter with 1-Wire Interface in QFN

Data sheet: PDF | HTML
Fully differential amplifiers

LMH6554 — 2.8 GHz Ultra Linear Fully Differential Amplifier

Data sheet: PDF | HTML
Fully differential amplifiers

THS4509 — 1.9-GHz, Wideband, Low-Noise, Low-Distortion, Fully-Differential Amplifier

Data sheet: PDF | HTML
Fully differential amplifiers

THS770006 — High-Speed Fully Differential ADC Driver Amplifier with +6dB Fixed Gain

Data sheet: PDF
High-speed ADCs (≥10 MSPS)

ADS4449 — Quad-Channel, 14-Bit, 250-MSPS Analog-to-Digital Converter (ADC)

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

TPS7A80 — 1-A, high-PSRR, ultra-low-dropout voltage regulator with low-IQ & enable

Data sheet: PDF | HTML
MOSFETs

CSD17313Q2 — 30-V, N channel NexFET™ power MOSFET, single SON 2 mm x 2 mm, 32 mOhm

Data sheet: PDF | HTML
RF VGAs

LMH6881 — 2.4GHz Programmable Differential Amplifier with Gain Control

Data sheet: PDF | HTML
eFuses & hot swap controllers

TPS2400 — 5.5-V over voltage protection controller with 100-V input transient protection

Data sheet: PDF | HTML

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Software

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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