TIDA-00826

50-Ohm 2-GHz Oscilloscope Front-end Reference Design

TIDA-00826

Design files

Overview

This reference design is part of an analog front-end for 50Ω-input oscilloscope application. System designers can readily use this evaluation platform to process input signals from DC to 2 GHz in both frequency-domain and time-domain applications.

Features

50-Ω input, analog front-end with input signal bandwidth of 2 GHz
System ENOB of 6 to 8 bits is achieved with this signal chain
Supports a maximum input signal of ± 3V, with user-selectable options for input AC or DC coupling
DC-offset correction feature available in DC-coupled input mode
Three input-amplitude voltage adjustment settings provided by the front-end π-attenuator: 1:1, 2:1 and 5:1
Low noise, high-performance fully-differential amplifier (LMH5401) used for single-ended to differential conversion
High performance digitally-controlled variable-gain amplifier (LMH6401) programmable from 26dB to -6dB gain in 1-dB steps to maintain full-scale input at the ADC
12-bit ADC12J4000 operating at 4GSPS for sampling input signals
Design supports +5 V supply using wall-mount power adapter or +12 V using internal FMC connection

Industrial

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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.

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Design guide — TIDA-00826

TIDUBA4.PDF (1449 K)

Reference design overview and verified performance test data

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Schematic — TIDA-00826

TIDRJW1.PDF (3700 K)

Detailed schematic diagram for design layout and components

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Bill of materials (BOM) — TIDA-00826

TIDRJW2.PDF (283 K)

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

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Gerber file — TIDA-00826

TIDCBF5.ZIP (1121 K)

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

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PCB layout — TIDA-00826

TIDRJW3.PDF (28400 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

Buck converters (integrated switch)

LM26400Y — Dual 2A, 500kHz Wide Input Range Buck Regulator

Data sheet: PDF | HTML

Buck converters (integrated switch)

TPS54327 — 4.5V to 18V Input, 3-A Synchronous Step-Down Converter

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Buck-boost, inverting & split-rail converters (integrated switch)

LMR70503 — 2.8V to 5.5V, 300mA Buck/Boost Negative Output Voltage Regulator

Data sheet: PDF

Buck-boost, inverting & split-rail converters (integrated switch)

TPS63060 — 2.5V to 12V input voltage, 93% Efficient, 2.25A Switch Current Limit, Buck-Boost Converter

Data sheet: PDF | HTML

Clock jitter cleaners & synchronizers

LMK04828 — Ultra low-noise JESD204B compliant clock jitter cleaner with integrated 2370 to 2630-MHz VCO0.

Data sheet: PDF | HTML

Comparators

LMC6762 — Dual Micro-Power Rail-to-Rail Input CMOS Comparator with Push-Pull Output

Data sheet: PDF

Configurable gates

SN74LVC1G57 — Configurable Multiple-Function Gate

Data sheet: PDF | HTML

Digital temperature sensors

LM95233 — ±2°C Dual Remote and Local Temperature Sensor with TruTherm Technology and SMBus Interface

Data sheet: PDF

Direction-controlled voltage translators

SN74AVC4T774 — 4-bit dual-supply bus transceiver with configurable voltage-level shifting and 3-state outputs

Data sheet: PDF | HTML

Fully differential amplifiers

LMH5401 — 8-GHz Ultra wideband fully differential amplifier

Data sheet: PDF | HTML

High-speed ADCs (≥10 MSPS)

ADC12J4000 — 12-Bit, 4.0-GSPS, RF Sampling Analog-to-Digital Converter (ADC)

Data sheet: PDF | HTML

High-speed op amps (GBW ≥ 50 MHz)

LMH6559 — 1750MHz, High-Speed, Closed-Loop Buffer

Data sheet: PDF

Inverting buffers & drivers