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

(ACTIVE) TIDA-00826

Description & Features

Technical Documents

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Key Document

Description

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

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Schematic/Block Diagram

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Design Files

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Bill of Materials (BOM)

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TI Devices (26)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
ADC12J4000  12-Bit, 4.0-GSPS, RF Sampling Analog-to-Digital Converter (ADC)  Analog-to-digital converters (ADCs)  Not Available View Design Kits & Evaluation Modules
CD74HC14  High Speed CMOS Logic Hex Schmitt-Triggered Inverters  Buffer/driver  Sample & Buy Not Available
CSD18532Q5B  60-V, N-Channel NexFET™ Power MOSFET  MOSFETs  Sample & Buy View Design Kits & Evaluation Modules
DRV777  7-bit Integrated Motor and Relay Driver  Motor drivers  Sample & Buy Not Available
LM26400Y  Dual 2A, 500kHz Wide Input Range Buck Regulator  Step-down (buck)  Sample & Buy View Design Kits & Evaluation Modules
LM95233  ±2°C Dual Remote and Local Temperature Sensor with TruTherm Technology and SMBus Interface  Temperature sensors  Sample & Buy View Design Kits & Evaluation Modules
LMC555  World’s smallest 555 timer with low power, high accuracy and a Fmax of 3MHz  Clock & timing  Sample & Buy View Design Kits & Evaluation Modules
LMC6762  Dual Micro-Power Rail-to-Rail Input CMOS Comparator with Push-Pull Output  Amplifiers  Sample & Buy Not Available
LMH5401  8GHz Ultra Wideband Fully Differential Amplifier  Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules
LMH6401  4.5 GHz Ultra Wideband Digital Variable Gain Amplifier  Amplifiers  Sample & Buy View Design Kits & Evaluation Modules
LMH6559  High-Speed, Closed-Loop Buffer  Special function amplifiers  Sample & Buy View Design Kits & Evaluation Modules
LMK04828  Ultra Low Jitter Synthesizer and Jitter Cleaner  Clock jitter cleaners  Sample & Buy View Design Kits & Evaluation Modules
LMR70503  2.8V to 5.5V, 300mA Buck/Boost Negative Output Voltage Regulator  Buck-boost & inverting  Sample & Buy View Design Kits & Evaluation Modules
LP38513  3A Fast Response Ultra Low Dropout Linear Regulator  Power management  Not Available View Design Kits & Evaluation Modules
OPA376  Precision, Low Noise, Low Iq Operational Amplifier  Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules
SN74AVC4T774  4-Bit Dual-Supply Bus Transceiver With Configurable Voltage-Level Shifting and 3-State Outputs  Voltage level translation  Sample & Buy View Design Kits & Evaluation Modules
SN74LVC1G57  Configurable Multiple-Function Gate  Gate  Sample & Buy Not Available
TLV702  300mA Low-Iq Low-Dropout (LDO) Regulator for Portables  Power management  Sample & Buy View Design Kits & Evaluation Modules
TPS2400  Overvoltage/Undervoltage Protection IC in SOT-23-5  Power switches  Sample & Buy View Design Kits & Evaluation Modules
TPS54327  4.5V to 18V Input, 3-A Synchronous Step-Down Converter  Step-down (buck)  Sample & Buy View Design Kits & Evaluation Modules
TPS63060  2.5V to 12V input voltage, 93% Efficient, 2.25A Switch Current Limit, Buck-Boost Converter  Buck-boost & inverting  Sample & Buy View Design Kits & Evaluation Modules
TPS723  200mA Negative-Output Low-Dropout (LDO) Linear Regulator  Power management  Sample & Buy Not Available
TPS732  Cap-Free, NMOS, 250mA Low Dropout Regulator with Reverse Current Protection  Power management  Sample & Buy View Design Kits & Evaluation Modules
TPS74901  Single Output LDO, 3.0A, Adj. (0.8 to 3.6V), Programmable Soft-Start  Power management  Sample & Buy View Design Kits & Evaluation Modules
TPS793  High PSRR, Low Noise, 200mA Single Output LDO,  Power management  Sample & Buy View Design Kits & Evaluation Modules
TRF3765  300M-4800MHz Low Noise Integer-N/Fractional-N PLL with Integrated VCO and up to 8 Outputs  Clock & timing  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
ADC12J4000 Download Download
CD74HC14 Download Download
Download Download
Download -
CSD18532Q5B VSON-CLIP (DNK)| 8 Download -
DRV777 Download
Download
LM26400Y Download Download
Download Download
LM95233 Download Download
LMC555 Download Download
Download
Download
LMC6762 Download Download
LMH5401 Download Download
LMH6559 Download Download
Download Download
LMK04828 Download Download
LMR70503 Download -
LP38513 Download
Download
OPA376 Download Download
Download Download
Download Download
SN74AVC4T774 Download Download
Download Download
Download Download
SN74LVC1G57 Download Download
Download Download
Download Download
Download Download
Download Download
Download -
TLV702 Download Download
Download Download
TPS2400 Download Download
TPS54327 Download Download
Download
TPS63060 Download -
TPS723 Download Download
TPS732 Download
Download
Download
TPS74901 Download -
Download
Download Download
TPS793 Download
Download
TRF3765 Download Download

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Technical Documents

View the Important Notice for TI Designs covering authorized use, intellectual property matters and disclaimers.

User guides (1)
Title Abstract Type Size (KB) Date Views TI Recommends
PDF 1449 14 Dec 2015 232
Design files (4)
Title Abstract Type Size (KB) Date Views
PDF 28400 18 Dec 2015 42
PDF 283 18 Dec 2015 52
PDF 3700 18 Dec 2015 156
ZIP 1121 30 Nov 2015 44

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