50-Ohm 2-GHz Oscilloscope Front-end Reference Design
TIDA-00826
This product has been released to the market and is available for purchase. For some products, newer alternatives may be available.
This product has been released to the market and is available for purchase. For some products, newer alternatives may be available.
See the Important Notice and Disclaimer covering reference designs and other TI resources.
Key Document
- 50-Ohm Oscilloscope Front-end Design Guide
(PDF 1449 KB)
14 Dec 2015
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
See the Important Notice and Disclaimer covering reference designs and other TI resources.
