Texas Instruments THS1030/31EVM Bedienungsanleitung

THS1030/31EVM Evaluation

Module for the

THS1030/THS1031 10ĆBit

ADC

2000 AAP Data Conversion

User’s Guide

SLAU040

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accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent

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How to Use This Manual

iii

Read This First

Preface

Read This First

About This Manual

This manual describes the physical characteristics, functions, modes of op-

eration, and configuration of the THS1030/31EVM evaluation module (EVM).

How to Use This Manual

Chapter 1 – Overview

Chapter 2 – Physical Description

Chapter 3 – Circuit Description

Chapter 4 – Modes of Operation

Running Title—Attribute Reference

Chapter Title—Attribute Reference

Contents

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

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

1.2 EVM Basic Functions 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.3 Power Requirements 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.4 THS1030/31EVM Operational Procedure 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2 Physical Description 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.1 PCB Layout 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.2 Parts LIst 2-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3 Circuit Description 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.1 Schematic Diagram 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.2 Circuit Function 3-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.2.1 Inputs 3-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.2.2 Clock Options 3-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.2.3 References 3-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.2.4 Power 3-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.2.5 Outputs 3-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.2.6 THS1031 Register Write 3-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4 Modes of Operation 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Running Title—Attribute Reference

Figures

2–1 Silk Top 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–2 Silk Bottom 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–3 Top 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–4 Inner 1 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–5 Inner 2 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–6 Bottom 2-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3–1 EVM Schematic Diagram 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3–2 EVM Schematic Diagram – DIPS 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3–3 EVM Schematic Diagram – LOGIC 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3–4 EVM Schematic Diagram – THS1031 3-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3–5 EVM Schematic Diagram – POWER_&_REF 3-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4–1 Common Mode Input VREF/2 – 1Vp-p Input Span (top/bottom mode) 4-2. . . . . . . . . . . . . . . .

4–2 Common Mode Input VREF/2 – 2Vp-p Input Span (top/bottom mode) 4-2. . . . . . . . . . . . . . . .

4–3 External Common Mode Input – 1Vp-p Input Span (center span mode) 4-3. . . . . . . . . . . . . .

4–4 External Common Mode Input – 2Vp-p Input Span (center span mode) 4-3. . . . . . . . . . . . . .

4–5 Differential Input – 1Vp-p Input Span (differential input mode) 4-4. . . . . . . . . . . . . . . . . . . . . . .

4–6 Differential Input – 2Vp-p Input Span (differential input mode) 4-4. . . . . . . . . . . . . . . . . . . . . . .

4–7 External Reference – Input Span and Bias Set by on Board Reference Circuit

(potentiometer P2 sets EXT_T, potentiometer P3 sets EXT_B)

4-5. . . . . . . . . . . . . . . .

Running Title—Attribute Reference

vii

Contents

Tables

2–1 Parts List 2-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3–1 Output Connector J4 3-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4–1 Board Jumper Settings for Various Modes of Operation 4-6. . . . . . . . . . . . . . . . . . . . . . . . . . . .

4–2 Jumper Settings for Clock Options 4-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

viii

1-1

Overview

This chapter gives a general overview of the THS1030/31EVM evaluation

module (EVM), and describes some of the factors that must be considered in

using this module.

Topic Page

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

1.2 EVM Basic Functions 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.3 Power Requirements 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.4 THS1030/31 Operational Procedure 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Chapter 1

Purpose

1-2

1.1 Purpose

The THS1030/31EVM evaluation module (EVM) provides a platform for

evaluation of the THS1030 and THS1031 10-bit analog-to-digital converters

(ADC) under various signal, reference, and supply conditions. Unless stated

explicitly, the functionality described in this user’s guide applies to both

THS1030 and THS1031 devices.

1.2 EVM Basic Functions

Analog input to the THS1030/31 is provided via an external SMA connector.

The input can be configured onboard to be ac, dc, or transformer coupled to

the input of the device.

An external SMA connector is provided on the THS1031 for the clamp input.

This allows external digital control of the ADC’s clamping function. The ADC

can be clamped to either the device reference or to ground via an onboard

jumper.

The EVM provides an external SMA connection for ADC clock input. This can

be configured to be either ac or dc coupled. Space is reserved on the board

for a crystal oscillator to perform this function, and can be populated when re-

quired.

In addition to the internal reference from the THS1030/31 device, options are

providedontheEVMtoallowadjustmentoftheADCreferenceviaanonboard

reference circuit.

Output from the EVM is via a 40-pin header connector. The digital lines from

the THS1030/31 are buffered using the SN74LVCC4245A before going to the

header.ThisallowstheTHS1030/31suppliestobevariedwithoutaffectingthe

output signal levels.

Power connections to the EVM are via 4-mm banana sockets. Separate input

connectors are provided for the analog and digital supply to the device, and

for the reference and output buffer circuits.

The THS1031 has a number of programmable registers that can be pro-

grammed using DIL switches on the EVM.

1.3 Power Requirements

TheEVMhas4dc-powersupplyconnections:5Vfortheoutputbuffers,2.7 V

to 5 V for the analog and digital supplies to the ADC, and 2.7 V to 5 V for the

referencecircuit.Eachofthesesuppliesisindependent,butitshouldbenoted

thattheinputthresholdsoftheADCwillvarydependentonthedigitalandana-

log supply voltages, as per the datasheet specification.

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