Texas Instruments TLC5540 User manual

TLC5540/TLC5510/TLC5510A

Evaluation Module

July 2002 Mixed-Signal Products

User’s Guide

SLAU007D

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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Information About Cautions and Warnings

iii

Read This First

Preface

Read This First

About This Manual

This user’s guide serves as a reference book for the TLC5540/

TLC5510/TLC5510A.Thisdocumentprovidesinformationtoassistmanagers

and hardware/software engineers in application development.

How to Use This Manual

This document contains the following chapters:

Chapter 1 Overview

Chapter 2 Circuit Description

Chapter 3 Physical Description

Information About Cautions and Warnings

This book may contain cautions and warnings.

This is an example of a caution statement.

A caution statement describes a situation that could potentially

damage your software or equipment.

This is an example of a warning statement.

A warning statement describes a situation that could potentially

cause harm to you.

The information in a caution or a warning is provided for your protection.

Please read each caution and warning carefully.

Related Documentation From Texas Instruments

ThefollowingdocumentsmaybeorderedbycontactingtheTexasInstruments

Product Information Center at one of the numbers listed on the next page, or,

they may be downloaded at:

http://www–s.ti.com/sc/docs/psheets/pids2.htm

TLC5510/TLC5510A Data Sheet (literature number SLAS095) contains

electrical specifications, available temperature options, general over-

view of the device, and application information.

TLC5540 Data Sheet (literature number SLAS105) contains electrical

specifications, available temperature options, general overview of the

device, and application information.

CE/FCC Warnings

Thisequipmentisintendedforuseinalaboratorytestenvironmentonly.Itgen-

erates,uses,andcanradiateradiofrequencyenergyandhasnotbeentested

for compliance with the limits of computing devices pursuant to subpart J of

part 15 of FCC rules. This device has been tested and found to comply with

the limits for a CISPRII Group 1 and the following directives: EMC Directive

89/336/EEC amending directive 92/31/EEC and 93/68/EEC as per

ENV50204:1995, EN55011: 1995 Class A, EN61000–4–4: 1995, and

EN6100–4–3: 1993. Operation of this equipment in other environments may

cause interference with radio communications, in which case the user at his

own expense will be required to take whatever measures may be required to

correct this interference.

Running Title—Attribute Reference

Chapter Title—Attribute Reference

Contents

1 Overview 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.1 Purpose 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.2 Power Supply Requirements 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2 Circuit Description 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.1 EVM Analog Input 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.1.1 Direct Input 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.1.2 Amplifier Input, DC-Coupled 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.1.3 Amplifier Input, AC-Coupled 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.1.4 Input Bias Operational Range 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.1.5 Test Points 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.1.6 User Supplied Input Circuit 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.2 Digital Output 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.3 Clock Circuit 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.4 Board Schematic 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3 Physical Description 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.1 Board Layout 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.2 Board Layers 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.3 Part Descriptions 3-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Running Title—Attribute Reference

Figures

2–1 Board Schematic 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3–1 EVM Board Layout 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3–2 EVM Board Layer 1 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3–3 EVM Board Layer 2 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3–4 EVM Board Layer 3 3-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3–5 EVM Board Layer 4 3-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Tables

1–1 Power Supplies 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–1 Amplifier Input Coupling 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–2 Input Voltage Setting 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–3 Test Points 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3–1 Part Descriptions 3-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-1

Overview

This chapter gives an overview of the TLC5540/TLC5510/TLC5510A

evaluation module (EVM).

Topic Page

1.1 Power Supply Requirements 1–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.2 Power Supply Requirements 1–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Chapter 1

Purpose

1-2

1.1 Purpose

TheTLC5540/TLC5510/TLC5510Aevaluationmodule(EVM)providesaplat-

form for lab prototype evaluation of the Texas Instruments TLC5540/

TLC5510/TLC5510A 8-bit, high-speed analog-to-digital converters.

Since practical operation can be acheived with a clock speed in excess of

40 MHz, the circuit layout is critical and does not lend itself to classic

breadboarding techniques. In fact, proper operation requires use of surface-

mount components.

1.2 Power Supply Requirements

The TLC5540/TLC5510/TLC5510A EVM is designed to be powered by

regulated lab power supplies. Three lab supplies are required for the best

performance.

Table 1–1.Power Supplies

If Amp Used By-pass Amp

Connector Supply TLC5540/5510/

5510A TLC5510/

5540/5510A

J2 Positive analog supply 5 V ±10% 5 V ±10%

J3 Negative analog supply –5 V ±10% N/A

J8 Digital supply 5 V ±10% 5 V ±10%

The 5 V and –5 V analog supplies share an analog ground plane. The digital

supply uses an isolated ground plane.

The two ground planes can be easily connected by soldering jumpers from

E21 to E22 or from E13 to E14. This allows the user to adapt the EVM to

various grounding conditions that can exist in an evaluation circuit interface.

2-1

Circuit Description

This chapter describes the EVM circuit and its operation.

Topic Page

2.1 EVM Analog Input 2–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.2 Digital Output 2–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.3 Clock Circuit 2–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.4 Board Schematic 2–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Chapter 2

EVM Analog Input

2-2

2.1 EVM Analog Input

The EVM analog input signal is applied to BNC connector J4 by one of four

methods:

Direct

Amplifier input (dc-coupled)

Amplifier input (ac-coupled)

User supplied input

2.1.1 Direct Input

To route the signal directly to the TLC5540/TLC5510/TLC5510A input, solder

jumpers from E7 to E8 and from E23 to E12. This provides a 50-Ωload (R5)

atinputconnectorJ4.Theinputsignalmustbedc-biasedtothespecifications

defined by the data sheet. The TLC5540/TLC5510/TLC5510A is connected

using its internal bias resistors. Jumper J6 bypasses one of the internal bias

resistorsandthusalterstheinputbiasrangerequiredbytheinputsignal. With

J6 installed, the voltage range of the TLC5540/TLC5510 is 0 V to 2.28 V (at

3.3 VDDA).

The TLC5510A uses only the center internal bias resistor with an externally-

applied regulated 4-V reference to generate the device reference voltage.

Hence the input signal range applied to J4 can be between 0 V–4 V.

The input signal is band-limited to 12 MHz by the LC filter consisting of FB5,

R15, and C5. For a bandwidth of 20 MHz, select a value for C5 in the 15 pF

to 33 pF range.

2.1.2 Amplifier Input, DC-Coupled

A THS3001 high-speed transconductance operational amplifier provides

buffering for dc-coupled amplifier-input signals. The amplifier circuit provides

a flat response to 300 MHz with a gain of two. It can drive a low impedance

load.

The values of R6 and R8 set the amplifier gain to two.

The gain can be reduced to one by removing R6. Since the inverting input is

a low-impedance current-controlled input, R8 must remain in the circuit, and

its value must be changed to 1 kΩ. This resistance value is critical because it

controls the high frequency response of the circuit. The TLC5510A amplifier

gain is set to one.

The output rolloff filter, consisting of R4 and C14, provides a small amount of

filtering against frequencies in excess of 20 MHz (fs/2). The value of C14 can

bealtered to change thefilter characteristics, or C14can be removed entirely.

Inmostcases,R4shouldbe retained to lowerthedirectcapacitiveloadonthe

operational amplifier, thereby avoiding high frequency peaking of the output

signal.

Resistor R7 also provides isolation against a direct capacitive load (such as

a scope probe) on the test point terminal.

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