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EVM Overview

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1 EVM Overview

1.1 Features

ADS7861/8361/7863EVM:

• Full-featured evaluation board for the ADS7861, ADS8361, and ADS7863, dual, 500-kSPS,

12-bit/16-bit, serial output, 2+2 analog input, simultaneous sampling analog-to-digital converters

• Analog inputs can be configured as single-ended or differential

• Built-in reference

• High-speed serial interface

This manual covers the operation of the ADS7861EVM, ADS8361EVM, and the ADS7863EVM,

collectively identified as ADS7861/8361/7863EVM. Throughout this document, the abbreviation EVM and

the term evaluation module are synonymous with the ADS7861/8361/7863EVM. Unless otherwise

indicated, all references to device operation apply to all three devices.

1.2 Introduction

The ADS7861 operates from 5 V for AV

and DV

while the ADS8361 operates from 2.7 V to 3.6 V for

and DV

. The ADS7863 operates from 2.7 V to 5.5 V for AV

and DV

. Each device is a

high-speed, low-power, 12-bit or 16-bit A/D converter (ADC).

The four fully-differential analog inputs are divided into two pairs (A and B). Each ADC accepts an analog

input voltage in the range of –VREF to +VREF (5 V

), centered on the internal 2.5-V reference. The

device also accepts bipolar input ranges when a level shift circuit is used in the analog frontend circuitry.

Refer to Section 12 of the Design Guide, Op Amps for Everyone (literature number SLOD006B) for

information on various circuit applications.

2 Analog Interface

For maximum flexibility, the ADS7861/8361/7863EVM is designed for easy interfacing to multiple analog

sources. Samtec part numbers SSW–110–22–F–D–VS–K and TSM–110–01–T–DV–P provide a

convenient, 10-pin, dual row header/socket combination at J1. This header/socket provides access to the

analog input pins of the ADC. Consult Samtec at http://www.samtec.com or call 1-800-SAMTEC-9 for a

variety of mating connector options. Table 1 summarizes the pinouts for analog interfaces J1.

Table 1. J1: Analog Interface Pinout

Pin Number Signal Description

J1.2 B1+ Noninverting input, channel B1

J1.4 B1– Inverting input, channel B1

J1.6 B0+ Noninverting input, channel B0

J1.8 B0– Inverting input, channel B0

J1.10 A1+ Noninverting input, channel A1

J1.12 A1– Inverting input, channel A1

J1.14 A0+ Noninverting input, channel A0

J1.16 A0– Inverting input, channel A0

Pins are unused and should be left open for

J1.18 Unused use with future amplifier and sensor input

modules.

External reference source input (2.5 V nom,

J1.20 REFIN

2.525 V max)

J1.1 to J1.19 (odd) AGND Analog ground connections

ADS7861/8361/7863EVM SLAU094A–October 2002–Revised May 2011

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