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

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.

TIDUBA4.PDF (1449 K)

Reference design overview and verified performance test data

TIDRJW1.PDF (3700 K)

Detailed schematic diagram for design layout and components

TIDRJW2.PDF (283 K)

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

TIDCBF5.ZIP (1121 K)

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

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)

LM26400YDual 2A, 500kHz Wide Input Range Buck Regulator

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Buck converters (integrated switch)

TPS543274.5V to 18V Input, 3-A Synchronous Step-Down Converter

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

LMR705032.8V to 5.5V, 300mA Buck/Boost Negative Output Voltage Regulator

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

TPS630602.5V to 12V input voltage, 93% Efficient, 2.25A Switch Current Limit, Buck-Boost Converter

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Clock jitter cleaners & synchronizers

LMK04828Ultra low-noise JESD204B compliant clock jitter cleaner with integrated 2370 to 2630-MHz VCO0.

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Comparators

LMC6762Dual Micro-Power Rail-to-Rail Input CMOS Comparator with Push-Pull Output

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Configurable gates

SN74LVC1G57Configurable Multiple-Function Gate

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Digital temperature sensors

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

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Direction-controlled voltage translators

SN74AVC4T7744-bit dual-supply bus transceiver with configurable voltage-level shifting and 3-state outputs

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High-speed ADCs (>10MSPS)

ADC12J400012-Bit, 4.0-GSPS, RF Sampling Analog-to-Digital Converter (ADC)

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

LMH65591750MHz, High-Speed, Closed-Loop Buffer

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Inverting buffers & drivers

CD74HC146-ch, 2-V to 6-V inverters with Schmitt-Trigger inputs

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Linear & low-dropout (LDO) regulators

LP385133-A, ultra-low-dropout voltage regulator with power good & enable for 1.8 V

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Linear & low-dropout (LDO) regulators

TLV702300-mA, high-PSRR, low-IQ, low-dropout voltage regulator with enable

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Linear & low-dropout (LDO) regulators

TPS723200-mA, negative, adjustable low-dropout voltage regulator with enable

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Linear & low-dropout (LDO) regulators

TPS732250-mA, high-accuracy, ultra-low-dropout voltage regulator with reverse current protection & enable

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Linear & low-dropout (LDO) regulators

TPS749013-A, low-VIN (0.8-V), adjustable ultra-low-dropout voltage regulator with power good & enable

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Linear & low-dropout (LDO) regulators

TPS793200-mA, low-dropout voltage regulator with enable

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N-channel MOSFETs

CSD18532Q5B60-V, N channel NexFET™ power MOSFET, single SON 5 mm x 6 mm, 3.2 mOhm

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Precision op amps (Vos<1mV)

OPA376Precision (0.025mV), low noise (7.5nV/rtHz), low quiescent current (760uA) op amp

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RF FDAs

LMH54018-GHz Ultra wideband fully differential amplifier

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RF PLLs & synthesizers

TRF3765300M-4800MHz Low Noise Integer-N/Fractional-N PLL with Integrated VCO and up to 8 Outputs

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RF VGAs

LMH64014.5 GHz ultra wideband digital variable gain amplifier

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Real-time clocks (RTCs) & timers

LMC555World’s smallest 555 timer with low power, high accuracy and a Fmax of 3MHz

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eFuses & hot swap controllers

TPS24005.5-V over voltage protection controller with 100-V input transient protection

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Technical documentation

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

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