It offers a flexible analysis platform able to processing enter alerts from DC to 2 GHz, supporting frequency-domain and time-domain functions.
The Oscilloscope Entrance-Finish Reference Design is a flexible and high-performance resolution that simplifies the event of precision measurement programs. Designed to cater to engineers, researchers, and builders, this reference design presents a sturdy sign acquisition and evaluation platform. The design ensures optimum software efficiency by that includes key parts resembling high-speed analogue-to-digital converters (ADCs), low-noise pre-amplifiers, and configurable sign conditioning circuits. Splendid to be used in digital take a look at gear, sign processing labs, and embedded programs growth, this design serves as a dependable basis for creating customized oscilloscope options or integrating oscilloscope functionalities into broader programs.
This reference design outlines a high-performance analog front-end tailor-made for a 50Ω-input oscilloscope software. The sign chain is designed to make sure optimum sign integrity, precision, and adaptableness, making it appropriate for superior measurement and information acquisition programs. The reference design TIDA-00826 by Texas Devices, begins with a three-step differential π-attenuator relay circuit for enter voltage amplitude adjustment, providing three selectable attenuation settings: 1:1, 2:1, and 5:1. That is adopted by the LMH5401, a low-noise, wideband, fully-differential amplifier (FDA) used for single-ended to differential sign conversion. It incorporates a 6 GHz bandwidth, wonderful linearity from DC to 2 GHz, and low input-voltage noise of 1.25 nV/√Hz, making it supreme for precision sign conditioning.
The LMH6401 digitally-controlled variable-gain amplifier (DVGA) is employed for exact achieve adjustment, programmable through an SPI interface in 1-dB steps throughout a 32-dB vary (-6 dB to 26 dB). This gadget drives a fifth-order 2.2 GHz low-pass filter, making certain sign integrity earlier than digitization. An ADC12J4000 12-bit analog-to-digital converter (ADC), working at 4 GSPS, digitizes the filtered sign. The ADC boasts wonderful noise and linearity efficiency as much as and past 3 GHz, attaining an efficient variety of bits (ENOB) of 6 to eight for oscilloscope functions.
The design helps AC/DC enter coupling with DC offset nulling through a potentiometer. The LMH6559 buffer offers DC-level shift, whereas an OPA376 servo-loop maintains the ADC’s optimum common-mode voltage. A 4 GHz ADC clock is generated utilizing the TRF3765 PLL and 100 MHz oscillator, making certain low section noise (-128 dBc/Hz at 1 MHz). The LMK04828 synchronizes the ADC and FPGA for seamless JESD204 communication. With a 2 GHz enter bandwidth, ±3V sign help, and +5V or +12V energy choices, it fits digital oscilloscopes, TDRs, and high-speed information acquisition programs.
TI has examined this reference design. It comes with a invoice of supplies (BOM), schematics, meeting drawing, printed circuit board (PCB) format, and extra. The corporate’s web site has further information concerning the reference design. To learn extra about this reference design, click on right here.
