Texas Instruments SLAU081 User Manual

 

User’s Guide

January 2002 AAP Data Acquisition (Dallas)

SLAU081

IMPORTANT NOTICE

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TI assumes no liability for applications assistance or customer product design. Customers are responsible for
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Mailing Address:

Texas Instruments
Post Office Box 655303
Dallas, Texas 75265

Copyright  2002, Texas Instruments Incorporated

EVM IMPORTANT NOTICE

Texas Instruments (TI) provides the enclosed product(s) under the following conditions:
This evaluation kit being sold by TI is intended for use for ENGINEERING

DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not considered by TI to
be fit for commercial use. As such, the goods being provided may not be complete in terms
of required design-, marketing-, and/or manufacturing-related protective considerations,
including product safety measures typically found in the end product incorporating the
goods. As a prototype, this product does not fall within the scope of the European Union
directive on electromagnetic compatibility and therefore may not meet the technical
requirements of the directive.

Should this evaluation kit not meet the specifications indicated in the EVM User’s Guide,
the kit may be returned within 30 days from the date of delivery for a full refund. THE
FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY SELLER TO
BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR
STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS
FOR ANY PARTICULAR PURPOSE.

The user assumes all responsibility and liability for proper and safe handling of the goods.
Further, the user indemnifies TI from all claims arising from the handling or use of the
goods. Please be aware that the products received may not be regulatory compliant or
agency certified (FCC, UL, CE, etc.). Due to the open construction of the product, it is
the user’s responsibility to take any and all appropriate precautions with regard to
electrostatic discharge.

EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE, NEITHER
PARTY SHALL BE LIABLE TO THE OTHER FOR ANY INDIRECT, SPECIAL,
INCIDENTAL, OR CONSEQUENTIAL DAMAGES.

TI currently deals with a variety of customers for products, and therefore our arrangement
with the user is not exclusive.

TI assumes no liability for applications assistance, customer product design,
software performance, or infringement of patents or services described herein.

Please read the EVM User’s Guide and, specifically, the EVM W arnings and Restrictions
notice in the EVM User’s Guide prior to handling the product. This notice contains
important safety information about temperatures and voltages. For further safety
concerns, please contact the TI application engineer.

Persons handling the product must have electronics training and observe good laboratory
practice standards.

No license is granted under any patent right or other intellectual property right of TI
covering or relating to any machine, process, or combination in which such TI products
or services might be or are used.

Mailing Address:

Texas Instruments
Post Office Box 655303
Dallas, Texas 75265

Copyright  2002, Texas Instruments Incorporated

EVM WARNINGS AND RESTRICTIONS

It is important to operate this EVM within the input voltage range of ±12 V and the output
voltage range of ±12 V.

Exceeding the specified input range may cause unexpected operation and/or irreversible
damage to the EVM. If there are questions concerning the input range, please contact a TI
field representative prior to connecting the input power.

Applying loads outside of the specified output range may result in unintended operation and/or
possible permanent damage to the EVM. Please consult the EVM User’s Guide prior to
connecting any load to the EVM output. If there is uncertainty as to the load specification,
please contact a TI field representative.

During normal operation, some circuit components may have case temperatures greater than
60°C. The EVM is designed to operate properly with certain components above 60°C as long
as the input and output ranges are maintained. These components include but are not limited
to linear regulators, switching transistors, pass transistors, and current sense resistors. These
types of devices can be identified using the EVM schematic located in the EVM User’s Guide.
When placing measurement probes near these devices during operation, please be aware
that these devices may be very warm to the touch.

Mailing Address:

Texas Instruments
Post Office Box 655303
Dallas, Texas 75265

Copyright  2002, Texas Instruments Incorporated

Running Title—Attribute Reference

Contents

1 Introduction 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.1 EVM Modes 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.1.1 Stand-Alone Mode 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.1.2 User Mode 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.2 Analog Input Conditioning 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.3 Analog Output Conditioning 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.4 Prototype Area 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2 Getting Started 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.1 Shipping (Default Configuration) 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.2 Jumpers 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.2.1 Analog I/O Signal Conditioning 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.2.2 Channel 0 Analog Input 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.2.3 Channel 0 Analog Output 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.2.4 Signal Generator 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.2.5 Voltage Reference 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.2.6 ADC Supply Voltage 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.2.7 Clock/Timer Routing 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.3 Switches 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.3.1 Stand-Alone-Mode, SW1-1 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.4 Connectors 2-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.5 ADC and DAC Direct Access 2-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.6 Host Communication 2-1 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.6.1 Common Connector 2-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.6.2 Legacy Connector 2-14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

A Bill of Materials, Board Layout, and Schematics A-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Chapter Title—Attribute Reference

v

Running Title—Attribute Reference

Figures

2–1 SAM Configuration 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Tables

2–1 Default Switch Settings 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–2 Default Jumper Settings 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–3 Jumper/Function Reference 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

vi

Chapter 1

Introduction

This chapter contains an overview of the features and functions of the EVM.

Topic Page

1.1 EVM Modes 1–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.2 Analog Input Conditioning 1–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.3 Analog Output Conditioning 1–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.4 Prototype Area 1–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-1

EVM Modes

This user’s guide has been written to help you get the most from your
evaluation module (EVM). The TLC4541 EVM is a member of the
multipurpose (MP) family of serial EVMs. It provides a platform to demonstrate
the performance and functionality of the TLC4541 ADC and the
TLV5636 DAC.

TI’s websites are regularly updated. They present the latest software
additions, development information, troubleshooting help, general
background, as well as all applicable data sheets.

For specific questions related to this EVM or device send an email to the
Analog Applications Team at [e-mail] and reference the
orderable tool description – TLC4541 EVM.

This user’s guide is divided into the following chapters:

- Chapter 1 offers an overview of the EVM and introduces the general

features and functions of the system.

- Chapter 2 describes the operation of the EVM from a user’s view . It details

options that can be modified, connectors used, and pinout details.

- Appendix A details the bill of materials (BOM) and the schematic, along

with explanations of certain EVM features.

1.1 EVM Modes

This EVM has been designed, tested, and shipped in a condition that enables
the user to begin evaluation with minimal effort.

There are basically two operating modes for the EVM. These modes are
mutually exclusive. They are:

- Stand-Alone Mode (SAM)

Stand-alone mode enables the user to check the system without the
support of a signal generator, pattern generator , or DSP. In this mode, the
digital output from the ADC is fed into the companion DAC and
reconstructed.

User mode is deselected if SAM is selected. The DSP will be unable to
communicate with either the ADC or the DAC.

- User Mode

The EVM typically operates via a DSP or a microprocessor. In this mode
the user is responsible for generating all the control signals. If user mode is
selected, SAM is deselected.

1-2

1.1.1 Stand-Alone Mode

A unique feature of this EVM is the facility it offers the user to closely couple
the ADC and DAC with a minimum of user intervention. This feature allows the
serial bit stream from the digitized analog output to be fed directly to the DAC.
Therefore, the signal that is fed into the ADC can be reconstructed via the
DAC. No DSP need be present.

SAM is selected by:

- Switching SW1-1 to the on position, LED is on.

1.1.2 User Mode

The user can connect the ADC to a DSP or to a microprocessor in two ways:

- Via IDC ribbon cable

- Via daughterboard connectors J16 and J17

User mode is selected by:

- Switching SW1-1 to the of f position, LED is off.

Analog Input Conditioning

For example, TI’s range of DSP starter kits (DSK modules) provides a simple
low-cost solution, offering a range of DSK modules for most needs. The EVM
also supports the TMS320C6000 daughtercard specification (SPRA711), in
addition to providing support for the Motorola specification for data
transfer (SPI).

1.2 Analog Input Conditioning

There are a number of methods to connect analog input signals to the EVM.
Chapter 2 discusses these alternatives.

1.3 Analog Output Conditioning

There are a number of methods to connect analog output signals to the EVM.
Chapter 2 discusses these alternatives.

1.4 Prototype Area

An area of the PWB has been set aside if none of the signal conditioning
options provided are suitable.

The prototype area has the following features:

- A matrix of plated-through holes (PTH)

- SMT pads in a standard 14-pin JEDEC footprint

- Convenient points to pick up all power options

Introduction

1-3

Chapter 2

Getting Started

This chapter describes how the user can modify the various options of
this EVM.

Topic Page

2.1 Shipping (Default Configuration) 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.2 Jumpers 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.3 Switches 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.4 Connectors 2-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.5 ADC and DAC Direct Access 2-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.6 Host Communication 2-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Getting Started

2-1

Shipping (Default Configuration)

It is very important that users feel comfortable with the EVM from the
beginning. To achieve this, each unit is manufactured and shipped in a
predetermined condition. This allows the user to begin evaluation of the
system immediately and to have confidence that the EVM is working.

To confirm that the EVM is working properly, follow the steps below:

1) Apply power to the system. The green LED will illuminate.

2) Ensure stand-alone mode (SAM) LED is on.

3) Check TP7 via oscilloscope. This will be a sine wave.

4) Press the reset button SW3.

5) Press the start button SW2.

6) Check TP20 with an oscilloscope. If the system is working properly, the
signal at TP20 will also be a sine wave.

The system works as illustrated below. Any analog input supplied to the ADC
will be digitized and reconstructed by the DAC.

Figure 2–1.SAM Configuration

TP7

ADC

DAC

TP20

The user may probe the data and control signals to observe the signals that
allow stand-alone mode to function.

2.1 Shipping (Default Configuration)

The EVM is tested and shipped with jumpers and switches in a predetermined
arrangement. This arrangement enables users to verify at once that the EVM
is working. The tables below list switch and jumper settings that the EVM
should be set to upon receipt.

Data

Data

Control

Electronics

DSP / Micro

Interface

2-2

Shipping (Default Configuration)

Th

clock. This has been designed to be as flexible as ossible to

Table 2–1.Default Switch Settings

Switch Settings

Default

Configuration

SW1-1 On Stand-alone mode is selected, LED is on
SW1-2 Off Reserved
SW1-3 Off Reserved
SW1-4 Off Reserved

Description

Table 2–2.Default Jumper Settings

Jumper Settings

Default Configuration Description

Pins 1–2 Pins 2–3
W1 Inserted Not inserted Input for channel 0 is via BNC connector J1.
W2 Not inserted Inserted Sine wave test signal is selected for channel 0.
W3 Not inserted Inserted Sine wave test signal is output for channel 0.
W4 Not inserted Inserted Onboard conditioned input for channel 0 is selected.
W5 Not populated Not populated
W6 Not populated Not populated
W7 Not populated Not populated
W8 Not populated Not populated
W9 Not inserted Disables onboard sine and triangle wave generator
W10 Inserted Not inserted SCLK routed to ADC
W11 Not inserted Inserted Signal conditioning output selected for channel 0
W12 Inserted Not inserted FS routed to ADC
W13 Not Inserted 5-V analog
W14 Inserted EVM reference or DAC’s on-chip reference selected.
W15 Not populated Not populated
W16 Inserted Not inserted Selects internal or external reference
W17 Inserted Not inserted Determines EVM reference voltage
W18 Not inserted Inserted FS routed to DAC
W19 Inserted Not inserted Selects source of signal conditioning output from DAC
W20 Not inserted

W21 Inserted Not inserted
W22 Inserted Not inserted
W23 Inserted Not inserted
W24 Not inserted
W25 Not populated Not populated

ese jumpers determine various options for supplying system
clock. This has been designed to be as flexible as possible to
accommodate many potential options.

p

p

pp

The hardware that can be reconfigured falls into one of the following sections:

- Jumpers

- Switches

- Connectors

Getting Started

2-3

Jumpers

2.2 Jumpers

The table below lists the functions that users can reconfigure along with the
shipping condition.

Table 2–3.Jumper/Function Reference

Function Reference Designator Subsection

Channel 0
Analog input W1, W1 1, W4, W2, W3 3.2.3
Analog output W14, W19, W18 3.2.4
Disable onboard signal generator W9 3.2.7
Voltage reference W16, W17 3.2.8

3.3-V/5-V analog supply select W13 3.2.9
Clock/timer routing W20, W21, W22, W23, W24 3.2.10

2.2.1 Analog I/O Signal Conditioning

The TLC4541 supports various signal conditioning configurations.
The user has the following options:

- Bypass signal conditioning

- Use the onboard signal conditioning. This consists of an operational

amplifier for each input channel configured with a gain of 1.

- Use the prototype area for signal conditioning.

- Use the expansion connector via a TI universal operational amplifier

evaluation module (such as SLOP224/SLOP249).

2.2.2 Channel 0 Analog Input

This is the primary analog input and can always be connected externally.

Analog Input Configuration Channel 0

Reference

Designator

W1 W1 allows the user to select between an analog input via BNC – J1 or IDC – J4 pin 1.

W11 W1 1 allows selection of either the conditioned or nonconditioned analog input signal.

W4 W4 allows the user to select either the prototype area output or the output from W1 1.
W2 W2 enables the user to select either the output from the expansion connector or the output

from the onboard signal generator.

W3 W3 completes the selection choices for channel 0 by determining if the output from W2 or W4

is chosen to be presented to the ADC.

Functional Description

2-4

2.2.3 Channel 0 Analog Output

With a one-channel DAC installed, this signal is the primary analog output
(output A).

With a two-channel DAC installed, the pinout of these devices effectively
resolves this channel to be the secondary analog output (output B).

Analog Input Configuration Channel 0

Reference

Designator

W19 This jumper selects the source for the analog output on channel 0.

When a jumper is installed between pins 1 and 2, the output from the expansion connector’s
B-channel is routed out.

When the jumper is installed between pins 2 and 3, the output from the onboard signal
conditioning is directed through channel 0.

Functional Description

2.2.4 Signal Generator

Signal Generator

Reference

Designator

W9 W9 controls the generation of both onboard test signals. A jumper installed between pins 1 and 2

disables the waveform generator.

Functional Description

Jumpers

2.2.5 Voltage Reference

V oltage Reference

Reference

Designator

W16 W16 selects either the onboard reference or an external reference supplied by the user.
W17 W17 allows the user to vary the reference voltage.
W14 There are a number of possible DACs that a user can install on this EVM. Some have an internal

reference that the user can select via software, and some do not have an internal reference. For
the DACs that support an internal reference, it is important to have the facility to remove the
external reference supplied by the EVM (or user) to avoid conflicts between the DAC’s internal
reference and the external reference.

Functional Description

2.2.6 ADC Supply Voltage

ADC Supply Voltage

Reference

Designator

W13 This jumper controls the analog supply voltage.

When the jumper is installed, the supply voltage to the ADC is 3.3 V.
When the jumper is not installed, the supply voltage to the ADC is 5 V.

Functional Description

Getting Started

2-5