Overview; Evm Analog Interface - Texas Instruments ADS8350EVM-PDK User Manual

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Overview

The ADS8350EVM-PDK is a platform for evaluation of the ADS8350 analog-to-digital converter (ADC).
The evaluation kit combines the ADS8350EVM board with a simple capture card controller board. The
simple capture card controller board consists of a TI Sitara embedded microcontroller (AM3352) and a
field programmable gate array (FPGA). The simple capture card controller board provides an interface
from the EVM to the computer through a universal serial bus (USB) port. The included software
communicates with the simple capture card controller board platform, and the simple capture card board
provides the power and digital signals used to communicate with the ADS8350EVM board. These
demonstration kits include the ADS8350EVM board, the simple capture card controller board, a microSD
memory card, and an A-to-micro-B USB cable.
1.1 ADS8350EVM Features
• Contains support circuitry as a design example to match ADC performance
• 3.3-V slave serial peripheral interface (SPI™)
• Onboard 5-V analog supply
• Onboard REF5025
• Voltage reference buffering with
• Onboard OPA2836
1.2 ADS8350EVM-PDK Features
• USB port for computer interfacing
• Easy-to-use evaluation software for Windows XP
• Data collection to text files
• Built-in analysis tools including scope, FFT, and histogram displays
• Complete control of board settings
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EVM Analog Interface

The ADS8350 is a dual-channel, simultaneous-sampling ADC that supports pseudo-differential analog
inputs. Each channel of the ADS8350 uses a OPA2836 dual operational amplifier to drive the inputs of the
ADC; see Figure 1. The positive input terminals of each ADC are driven by the OPA836 operational
amplifier configured in the inverting configuration. The negative input terminals of each ADC are driven by
the OPA836 in the buffer configuration and biased at the 2.5-V, onboard reference voltage (+V
ADS8350EVM is designed for easy interfacing to multiple analog sources. SMA connectors allow the EVM
to have input signals connected through coaxial cables. In addition, header connectors JP1 and JP2
provide a convenient way to connect input signals.
SBAU218A – April 2014 – Revised October 2014
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(2.5-V) reference
OPA2350
(205-MHz BW, 1-mA quiescent current) ADC operational amplifier input drivers
Copyright © 2014, Texas Instruments Incorporated
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