Texas Instruments THS1030/31EVM User manual

THS1030/31EVM Evaluation
Module for the
THS1030/THS1031 10ĆBit
ADC
2000 AAP Data Conversion
User’s Guide
SLAU040

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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

iv

Running Title—Attribute Reference
v
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
vi
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
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.