Texas Instruments ADS8638EVM-PDK Manual de usuario

User's Guide

SBAU192–July 2011

ADS8638EVM-PDK

This user's guide describes the characteristics, operation, and use of the ADS8638EVM, both by itself and

as a part of the ADS8638EVM-PDK. This evaluation module (EVM) is designed to feature the ADS8638

but can also support the ADS8614,ADS8618,orADS8634 if installed. This family of devices includes

either an 8- or 12-bit, 1-MHz, multi-channel, successive approximation register (SAR) analog-to-digital

converters (ADCs). The EVM allows evaluation of all aspects of the ADS8638 device. A complete circuit

description as well as schematic diagram and bill of materials are included.

The following related documents are available for download through the Texas Instruments web site at

http://www.ti.com.

EVM-Related Device Data Sheets

Device Literature Number

ADS8638 SBAS541A

OPA140 SBOS498A

OPA379 SBOS347D

REF5025 SBOS410E

SN74LVC1G17D SCES351R

Microsoft, Windows are registered trademarks of Microsoft Corporation.

SPI is a trademark of Motorola, Inc.

I2C is a trademark of NXP Semiconductors.

All other trademarks are the property of their respective owners.

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Contents

1 EVM Overview ............................................................................................................... 3

2 Analog Interface ............................................................................................................. 4

3 Digital Interface .............................................................................................................. 5

4 Power Supplies .............................................................................................................. 5

5 EVM Operation .............................................................................................................. 6

6 ADS8638EVM-PDK Kit Operation ........................................................................................ 7

7 Evaluating Performance with the ADCPro Software .................................................................. 14

8 EVM Bill of Materials, Schematic, and Layout ......................................................................... 20

List of Figures

1 ADS8638EVM Default Jumper Locations................................................................................ 7

2 ADS8638EVM-PDK Installer .............................................................................................. 8

3 Completed ADS8638EVM-PDK Installer................................................................................. 8

4 MMB0 Initial Setup.......................................................................................................... 9

5 Connecting ADS8638EVM to MMB0 ................................................................................... 10

6 Laboratory Power-Supply Connections................................................................................. 11

7 NI-VISA Driver Installation................................................................................................ 12

8 ADS86xxEVM-PDK Plug-in .............................................................................................. 13

9 Device Configuration...................................................................................................... 15

10 Channels Tabs............................................................................................................. 17

11 GPIOs &Alarms Tab...................................................................................................... 18

12 ADS8638EVM PCB: Top Layer ......................................................................................... 21

13 ADS8638EVM PCB: Mid Layer.......................................................................................... 22

14 ADS8638EVM PCB: Ground Layer ..................................................................................... 22

15 ADS8638EVM PCB: Bottom Layer...................................................................................... 23

List of Tables

1 J1: Analog Interface Header............................................................................................... 4

2 J2: Serial Interface Header ................................................................................................ 5

3 J3: Power-Supply Interface Header ...................................................................................... 5

4 JP3 Configuration: Power Options........................................................................................ 6

5 Bill of Materials ............................................................................................................ 20

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EVM Overview

1 EVM Overview

1.1 Features

ADS8638EVM:

•Full-featured evaluation board for the ADS8638 SAR ADC

•Contains all support circuitry needed for the ADS8638

•Optional onboard external REF5025 reference source

•Compatible with the TI Modular EVM System

ADS8638EVM-PDK:

•Easy-to-use evaluation software for Microsoft®Windows®XP operating system

•Data collection to text files

•Built-in analysis tools including scope, FFT, and histogram displays

•Complete control of board settings

•Easily expandable with new analysis plug-in tools from Texas Instruments

For use with a computer, the ADS8638EVM-PDK is also available. This kit combines the ADS8638 board

with the DSP-based MMB0 motherboard, and includes ADCPro software for evaluation.

The MMB0 motherboard allows the ADS8638EVM to be connected to the computer via an available USB

port. This manual shows how to use the MMB0 as part of the ADS8638EVMPDK, but does not provide

technical details about the MMB0 itself.

ADCPro is a program for collecting, recording, and analyzing data from ADC evaluation boards. It is based

on a number of plug-in programs, so it can be expanded easily with new test and data collection plug-ins.

The ADS8638EVM-PDK is controlled by a plug-in running in ADCPro. For more information about

ADCPro, see the ADCPro™Analog-to-Digital Converter Evalutation Software User's Guide (literature

number SBAU128), available for download from the TI web site.

This manual covers the operation of both the ADS8638EVM and the ADS8638EVM-PDK. Throughout this

document, the abbreviation EVM and the term evaluation module are synonymous with the

ADS8638EVM. For clarity of reading, the rest of this manual will refer only to the ADS8638EVM or

ADS8638EVM-PDK, but operation of the EVM and kit for the ADS8614, ADS8618, and ADS8634 is

identical, unless otherwise noted.

1.2 Introduction

The ADS8638 is a 12-bit, eight-channel, 1-MHz SAR ADC with a serial peripheral interface ( SPI™). The

ADC uses a capacitor-based switching method to create an adjustable input voltage range option.

Additionally, the device features two preset alarms with hysteresis per channel. During normal operation,

the ADS8638 dissipates a mere 22.5 mW at 5-V AVDD and ±15-V high voltage supplies.

The ADS8638EVM is an evaluation module built to the TI Modular EVM System specification. It can be

connected to any modular EVM system interface card.

The ADS8638EVM is available as a stand-alone printed circuit board (PCB) or as part of the

ADS8638EVM-PDK, which includes an MMB0 motherboard and software. As a stand-alone PCB, the

ADS8638EVM is useful for evaluating designs and firmware.

Note that the ADS8638EVM has no microprocessor and cannot run software. To connect it to a computer,

some type of interface is required.

SBAU192–July 2011 ADS8638EVM-PDK

Analog Interface

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2 Analog Interface

For maximum flexibility, the ADS8638EVM 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 www.samtec.com or call 1-800-SAMTEC-9 for a variety of mating connector

options. Table 1 shows the pinout of the analog input connector, J1.

Table 1. J1: Analog Interface Header

Pin Number Signal Description

J1.2 AIN7 / NC ADC analog input (AIN7: ADS8x38, NC: ADS8x34)

J1.4 AIN6 / NC ADC analog input (AIN6: ADS8x38, NC: ADS8x34)

J1.6 AIN5 / AIN3 ADC analog input (AIN5: ADS8x38, AIN3:

ADS8x34)

J1.8 AIN4 / AIN2 ADC analog input (AIN4: ADS8x38, AIN2:

ADS8x34)

J1.10 AIN3 / AIN1 ADC analog input (AIN3: ADS8x38, AIN1:

ADS8x34)

J1.12 AIN2 / AIN0 ADC analog input (AIN2: ADS8x38, AIN0:

ADS8x34)

J1.14 AIN1 / NC ADC analog input (AIN1: ADS8x38, NC: ADS8x34)

J1.16 AIN0 / NC ADC analog input (AIN0: ADS8x38, NC: ADS8x34)

J1.1-19 (odd) GND Analog ground connections (except J1.15)

J1.15 VREFOUT Buffered reference output

J1.18 NC —

J1.20 Ext VREF External reference voltage input

The eight ADC analog inputs (four inputs for ADS8x34 devices) are available at the J1 header. All of these

inputs, with the exception of one, are routed directly from the J1 header to the ADC. The AIN2/AIN0

channel includes an OPA140 to help drive one of the analog input channels to show the proper way to

drive the ADC. The op amp is in unity gain, and includes a RC low-pass filter component before reaching

the ADC.

An external reference can be applied to the ADC via an external source using pin J1.20. This signal is

routed directly to JP2 where it can be jumped in to the VREFP line.

An OPA379 is located on the EVM to buffer the reference signal and output it on J1.15.

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Digital Interface

3 Digital Interface

3.1 Serial Data Interface

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 J2. This header/socket provides access to the digital control pins of the

EVM. Consult Samtec at www.samtec.com or 1-800-SAMTEC- 9 for a variety of mating connector options.

Table 2 describes the J2 serial interface pins.

Table 2. J2: Serial Interface Header

Pin Number Signal Description

J2.1 CS ADC CS signal: controlled by jumper JP1

J2.2 GPIO ADC PD / Alert signal

J2.3 SCLK ADC SCLK signal

J2.4 GND Digital ground

J2.5 SCLK ADC SCLK signal

J2.7 CS ADC CS signal: controlled by jumper JP1

J2.9 CS ADC CS signal: controlled by jumper JP1

J2.10 GND Digital ground

J2.11 SDI ADC SDI signal

J2.13 SDO ADC SDO signal

J2.16 SCL I2C™clock line for EEPROM

J2.18 GND Digital ground

J2.20 SDA I2C data line for EEPROM

4 Power Supplies

J3 is the power-supply input connector. Table 3 lists the configuration details for J3.

Table 3. J3: Power-Supply Interface Header

Pin Number Pin Name Function Required

J3.1 +VA High voltage positive Yes

analog supply

J3.2 –VA High voltage negative Yes

analog supply

J3.3 +5VA 5-V analog supply Yes

J3.4 –5VA Unused No

J3.5 GND Digital ground input Yes

J3.6 GND Analog ground input Yes

J3.7 +1.8VD 1.8-V digital supply Yes/Optional

J3.8 VD1 Unused No

J3.9 +3.3VD 3.3-V digital supply Yes/Optional

J3.10 +5VD Unused Yes/Optional

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EVM Operation

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4.1 Power Options

JP3 is in place for current measurement in order to regulate the power consumption of the ADS8638.

When current measurement is not taking place, jumpers must be applied across many of the jumpers to

properly power the ADC. Table 4 lists the power option details for JP3.

Table 4. JP3 Configuration: Power Options

Row Name Function

1-2 ADC HVDD Supply current measurement point for high

voltage positive rail. Must be connected for

operation.

3-4 ADC HVEE Supply current measurement point for high

voltage negative rail. Must be connected for

operation.

5-6 ADC +5 VA Supply current measurement point for

+5-VA voltage rail. Must be connected for

operation.

7-8 GND Ground points for EVM board

9-10 ADC +3.3 VD Supply current measurement point for 3.3-V

digital supply rail. Must be connected for

ADC use with DVDD = 3.3 V. Do not

connect if +5-VD jumper is installed.

11-12 ADC +1.8 VD Supply current measurement point for 1.8V

digital supply rail. Must be connected for

ADC use with DVDD = 1.8 V. Do not

connect if +3.3-VD jumper is installed.

The ADS8638EVM has the option to either set +1.8 VD or +3.3 VD as the ADS8638 DVDD supply. Install

a jumper across pins 9-10 to set DVDD = 3.3 V, or install a jumper across pins 11-12 to set DVDD =

1.8 V.

CAUTION

Do not install both jumpers. Doing so may cause damage to the board or ADC

device itself.

4.2 Reference Voltages

The ADS8638EVM can be configured to use the internal reference voltage found within the chip, an

onboard REF5025 reference source, or use the option to input an external reference source. Jumper JP2

is used to route the reference signal to the ADC. When placed in the 1-2 position, the onboard REF5025

is used as the reference signal. When placed in the 2-3 position, an outside external reference can be

applied to J1.20 on the analog header to feed the ADC reference. If the ADC internal reference is

enabled, the shunt on jumper JP2 must be either in the 2-3 position or left disconnected. This

configuration ensures that the REF5025 source is not driving the ADS8638 reference pin when the pin is

configured as an output.

5 EVM Operation

This section provides information on the analog input, digital control, and general operating conditions of

the ADS8638EVM.

5.1 Analog Input

Each of the analog input sources can be applied directly to J1 (top or bottom side) or through

signal-conditioning modules available for the modular EVM system.

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ADS8638EVM-PDK Kit Operation

5.2 Digital Control

The digital control signals can be applied directly to J2 (top or bottom side). The modular ADS8638EVM

can also be connected directly to a DSP or microcontroller interface board, such as the 5-6K Interface or

HPA-MCU Interface boards available from Texas Instruments, or the MMB0 if purchased as part of the

ADS8638EVM-PDK. For a list of compatible interface and/or accessory boards for the EVM or the

ADS8638, see the relevant device product folder on the TI web site

5.3 Default Jumper Settings and Switch Positions

Figure 1 shows the jumpers found on the EVM and the respective factory default conditions for each.

Figure 1. ADS8638EVM Default Jumper Locations

6 ADS8638EVM-PDK Kit Operation

This section provides information on the analog input, digital control, and general operating conditions of

the ADS8638EVM.

6.1 Installing ADCPro Software

The latest software is available from the TI website at http://www.ti.com. Any updates to the ADCPro

software can also be downloaded directly from the TI web site (http://www.ti.com/adcpro) or the update

check command can be used. Refer to the ADCPro User Guide for instructions on installing and using

ADCPro.

To install the ADS8638EVM-PDK plug-in, run the file: ads86xx-adcproplugin-1.2.3.exe (1.2.3 is the

version number, and increments with software version releases). Double-click the file to run it; then follow

the instructions shown. You can also use the ADCPro Update Check feature to check for newer versions

of the ADS8638EVM-PDK plug-in, once you have installed a version of it.

SBAU192–July 2011 ADS8638EVM-PDK

ADS8638EVM-PDK Kit Operation

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Figure 2 and Figure 3 show a set of installation screens to pass through as the ADS86xxEVM-PDK plug-in

is installed.

Figure 2. ADS8638EVM-PDK Installer

Continue through the pop-up screens until the plug-in is completely installed.

Figure 3. Completed ADS8638EVM-PDK Installer

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ADS8638EVM-PDK Kit Operation

6.2 Setting Up the ADS8638EVM-PDK

The ADS8638EVM-PDK contains both the ADS8638EVM and the MMB0 motherboard; however, the

devices are shipped unconnected. Follow these steps to set up the ADS8638EVM-PDK.

Step 1. Unpack the ADS8638EVM-PDK kit.

Step 2. Set the jumpers and switches on the MMB0 as shown in Figure 4.

•Set the Boot Mode switch to USB.

•Connect +5 V and +5 VA on jumper block J13B (if +5 V is supplied from J14 +5 VA).

•Leave +5 V and +VA disconnected on jumper block J13A.

•If the PDK is powered from an ac adapter, connect J12. If the PDK is powered through

the terminal block, disconnect J12. (See Section 6.3 for details on connecting the power

supply.)

Figure 4. MMB0 Initial Setup

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ADS8638EVM-PDK Kit Operation

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Step 3. Plug the ADS8638EVM into the MMB0 as Figure 5 illustrates.

Figure 5. Connecting ADS8638EVM to MMB0

Step 4. Set the jumpers on the ADS8638EVM as shown in Figure 1 (note that these settings are the

factory-configured default settings for the EVM).

6.2.1 About the MMB0

The MMB0 is a Modular EVM System motherboard. It is designed around the TMS320VC5507, a DSP

with an onboard USB interface from Texas Instruments. The MMB0 also has 16 MB of SDRAM installed.

The MMB0 is not sold as a DSP development board, and it is not available separately. TI cannot offer

support for the MMB0 except as part of an EVM kit. For schematics or other information about the MMB0,

contact Texas Instruments.

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