TIDA-010133

High-impedance, 500MHz bandwidth, oscilloscope analog front-end reference design

TIDA-010133

Design files

Overview

High Bandwidth data acquisition systems, like a digital storage oscilloscope (DSO), require the analog front-end (AFE) signal chain to have wide (-3dB) bandwidth to measure a wide range of signals, optional high input impedance to prevent loading of the measured signal, low noise to prevent degradation of signal to noise ration (SNR), and good distortion performance to maintain signal fidelity. Typical implementations of an AFE typically requires either a complex discrete design or the development of a custom front-end ASIC. This reference design provides a simpler cost-effective AFE without sacrificing performance.

Features
  • 500MHz input bandwidth
  • Selectable impedance (50Ω or 1MΩ)
  • Support DC/AC coupling
  • Wide dynamic range of 40dB programmable gain
  • Support trigger function
  • Precision DAC for offset control and commonmode control
  • SMA connector to support TI high-speed ADC EVM
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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.

PDF | HTML
TIDUC09.PDF (3117 KB)

Reference design overview and verified performance test data

TIDME80.PDF (1424 KB)

Detailed overview of design layout for component placement

TIDME82.PDF (262 KB)

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

TIDME81.ZIP (10993 KB)

Files used for 3D models or 2D drawings of IC components

TIDCGY2.ZIP (2654 KB)

Design file that contains information on physical board layer of design PCB

TIDME79.PDF (7061 KB)

PCB layer plot file used for generating PCB design layout

TIDME78.ZIP (116 KB)

Detailed schematic diagram for design layout and components

Products

Includes TI products in the design and potential alternatives.

Comparators

TLV3605800-ps high-speed rail-rail input comparator with LVDS outputs

Data sheet: PDF | HTML
Fully differential amplifiers

LMH65521.5 GHz Fully Differential Amplifier

Data sheet: PDF | HTML
High-speed op amps (GBW ≥ 50 MHz)

BUF802Wide-bandwidth, 2.3-nV/√Hz, high-input impedance JFET buffer

Data sheet: PDF | HTML
Precision DACs (≤10 MSPS)

DAC80508True 16-bit, 8-channel, SPI, voltage-output DAC with precision internal reference

Data sheet: PDF | HTML
Precision op amps (Vos<1mV)

OPA2140Dual-channel, 11-MHz, low-noise 36-V JFET precision operational amplifier with rail-to-rail output

Data sheet: PDF | HTML
Programmable & variable gain amplifiers (PGAs & VGAs)

LMH6518900 MHz, Digitally Controlled, Variable Gain Amplifier

Data sheet: PDF | HTML

Technical documentation

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* Design guide High-Impedance, 500MHz Bandwidth Oscilloscope Analog Front End Reference Design PDF | HTML Jul 29, 2026

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