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Overview
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4 SBAU262 – August 2016
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ADS9120EVM-PDK
1 Overview
The ADS9120EVM-PDK is a platform for evaluating the performance of the ADS9120 SAR ADC, which is
a fully-differential input, 16-bit, 2.5-MSPS device. The evaluation kit includes the ADS9120EVM board and
the precision host interface (PHI) controller board that enables the accompanying computer software to
communicate with the ADC over USB for data capture and analysis.
The ADS9120EVM board includes the ADS9120 SAR ADC, all the peripheral analog circuits, and
components required to extract optimum performance from the ADC.
The PHI board primarily serves three functions:
• Provides a communication interface from the EVM to the computer through a USB port
• Provides the digital input and output signals necessary to communicate with the ADS9120EVM
• Supplies power to all active circuitry on the ADS9120 board
Along with the ADS9120EVM and PHI controller board, this evaluation kit includes an A-to-micro-B USB
cable to connect to a computer.
1.1 ADS9120EVM-PDK Features
The ADS9120EVM-PDK includes the following features:
• Hardware and software required for diagnostic testing as well as accurate performance evaluation of
the ADS9120 ADC
• USB powered—no external power supply is required
• The PHI controller that provides a convenient communication interface to the ADS9120 ADC over a
USB 2.0 (or higher) for power delivery as well as digital input and output
• Easy-to-use evaluation software for Microsoft
®
Windows
®
7, Windows
®
8, 64-bit operating systems
• The software suite includes graphical tools for data capture, histogram analysis, spectral analysis and
linearity analysis. This suite also has a provision for exporting data to a text file for post-processing.
1.2 ADS9120EVM Features
The ADS9120EVM includes the following features:
• Onboard low-noise and low distortion ADC input drivers optimized to meet ADC performance
• Onboard precision 5.0-V voltage reference filtered and followed by a low-noise, low-offset and low-
impedance buffer. The reference driver circuit is optimized for 1-LSB voltage regulation under
maximum loading conditions at full device throughput of 2.5 MSPS.
• Jumper-selectable 0-V and 2.5-V input common-mode options allow unipolar and bipolar inputs.
• Onboard ultralow noise low-dropout (LDO) regulator for excellent 5.2-V single-supply regulation of all
operation amplifiers and voltage reference.