TIDA-00826

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

Design files

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

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.

Design guide — TIDA-00826

TIDUBA4.PDF (1449 K)

Reference design overview and verified performance test data

Schematic — TIDA-00826

TIDRJW1.PDF (3700 K)

Detailed schematic diagram for design layout and components

Bill of materials (BOM) — TIDA-00826

TIDRJW2.PDF (283 K)

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

Gerber file — TIDA-00826

TIDCBF5.ZIP (1121 K)

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

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

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Buck converters (integrated switch)

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

Data sheet

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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

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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

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Clock jitter cleaners & synchronizers

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

Data sheet

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Comparators

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

Data sheet

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Configurable gates

SN74LVC1G57 — Configurable Multiple-Function Gate

Data sheet

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Digital temperature sensors

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

Data sheet

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Direction-controlled voltage translators

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

Data sheet

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High-speed ADCs (>10MSPS)

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

Data sheet

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High-speed op amps (GBW>=50MHz)

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

Data sheet

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PDF

Inverting buffers & drivers

CD74HC14 — 6-ch, 2-V to 6-V inverters with Schmitt-Trigger inputs

Data sheet

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Linear & low-dropout (LDO) regulators

LP38513 — 3-A, ultra-low-dropout voltage regulator with power good & enable for 1.8 V

Data sheet

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Linear & low-dropout (LDO) regulators

TLV702 — 300-mA, high-PSRR, low-IQ, low-dropout voltage regulator with enable

Data sheet

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Linear & low-dropout (LDO) regulators

TPS723 — 200-mA, negative, adjustable low-dropout voltage regulator with enable

Data sheet

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Linear & low-dropout (LDO) regulators

TPS732 — 250-mA, high-accuracy, ultra-low-dropout voltage regulator with reverse current protection & enable

Data sheet

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Linear & low-dropout (LDO) regulators

TPS74901 — 3-A, low-VIN (0.8-V), adjustable ultra-low-dropout voltage regulator with power good & enable

Data sheet

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Linear & low-dropout (LDO) regulators

TPS793 — 200-mA, low-dropout voltage regulator with enable

Data sheet

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N-channel MOSFETs

CSD18532Q5B — 60-V, N channel NexFET™ power MOSFET, single SON 5 mm x 6 mm, 3.2 mOhm

Data sheet

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Precision op amps (Vos<1mV)

OPA376 — Precision (0.025mV), low noise (7.5nV/rtHz), low quiescent current (760uA) op amp

Data sheet

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RF FDAs

LMH5401 — 8-GHz Ultra wideband fully differential amplifier

Data sheet

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RF PLLs & synthesizers

TRF3765 — 300M-4800MHz Low Noise Integer-N/Fractional-N PLL with Integrated VCO and up to 8 Outputs

Data sheet

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RF VGAs

LMH6401 — 4.5 GHz ultra wideband digital variable gain amplifier

Data sheet

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Real-time clocks (RTCs) & timers

LMC555 — World’s smallest 555 timer with low power, high accuracy and a Fmax of 3MHz

Data sheet

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eFuses & hot swap controllers

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

Data sheet

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Technical documentation

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	Type	Title	Date
*	Design guide	50-Ohm Oscilloscope Front-end Design Guide	Dec. 14, 2015

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