Texas Instruments ADS1110EVM User manual


 
September 2003
User’s Guide
SBAU089
Data Acquisition Products

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Copyright 2003, Texas Instruments Incorporated

ADS1110EVM
User’s Guide
SBAU089
Data Acquisition Products—Semiconductor Group
Printed on Recycled Pape
r

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 Warnings 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 2003, Texas Instruments Incorporated

EVM WARNINGS AND RESTRICTIONS
It is important to operate this EVM within the specified input and output ranges described in
the EVM User’s Guide.
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 2003, Texas Instruments Incorporated

Contents
iii
Contents
Preface

About This Manual
This manual describes the ADS1110EVM evaluation fixture and how to use it.
Throughout this document, the abbreviation EVM and the term evaluation
module are synonymous with the ADS1110EVM.
Information About Cautions and Warnings
This book contains cautions.
This is an example of a caution statement.
A caution statement describes a situation that could potentially
damage your software or equipment.
The information in a caution is provided for your protection. Please read each
caution carefully.
Related Documentation From Texas Instruments
The following document provides information regarding Texas Instruments
integrated circuits used in the assembly of the ADS1110EVM. This docu-
ment is available from the TI web site. The last character of the literature
number corresponds to the document revision, which is current at the time
of the writing of this User’s Guide. To obtain a copy of the following TI docu-
ment, visit our website at http://www.ti.com/ or call the Texas Instruments
Literature Response Center at (800) 477−8924 or the Product Information
Center at (972) 644−5580. When ordering, identify the document by both
title and literature number.
Data sheet Literature number
ADS1110 Data Sheet SBAS276

Contents
iv
If You Need Assistance
If you have questions regarding either the use of this evaluation module or
the information contained in the accompanying documentation, please con-
tact the Texas Instruments Product Information Center at (972) 644−5580
or visit the TI web site at www.ti.com.
FCC Warning
This equipment is intended for use in a laboratory test environment only. It
generates, uses, and can radiate radio frequency energy and has not been
tested for compliance with the limits of computing devices pursuant to sub-
part J of part 15 of FCC rules, which are designed to provide reasonable
protection against radio frequency interference. Operation of this equip-
ment in other environments may cause interference with radio communica-
tions, in which case the user at his own expense will be required to take
whatever measures may be required to correct this interference.
Trademarks
All trademarks are the property of their respective owners.

Contents
v

1 Overview 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.1 Introduction 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2 Connectors 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3 Controls 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.4 Setting Up 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 Circuit Description 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1 ADS1110 Devices 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2 I/O Connectors and Testpoints 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3 Jumpers 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.4 Switches 2-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 Schematic and Layout 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1 Schematic 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2 Board Layout 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3 Bill of Materials 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Contents
vi

Figure 2−1. Connectors and Jumpers 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2−2. Analog Connector Pinout 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2−3. Serial Connector Pinout 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2−4. Power Connector Pinout 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2−5. Jumper Block J3 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3−1. Schematic 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3−2. Top Side Layout 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3−3. Bottom Side Layout 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table 2−1. ADS1110 Devices 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 2−2. Analog Connector Pin Descriptions 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 2−3. Serial Connector Pin Descriptions 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 2−4. Power Connector Pin Descriptions 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 2−5. Digital Power Supply Level Select Switch 2-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 3−1. Bill of Materials 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-1
Overview

The ADS1110EVM is an evaluation fixture for the ADS1110 16-bit delta-sigma
(∆∑) analog-to-digital converter (ADC). Designed for prototyping and
evaluation, it includes four ADS1110 devices, each with a different I2C address.
Topic Page
1.1 Introduction 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2 Connectors 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3 Controls 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.4 Setting Up 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 1

Introduction
1-2
1.1 Introduction
Many data converter evaluation fixtures contain a computer interface or a
microcontroller, but the ADS1110EVM contains only the ADS1110 device and
a few support components. All ADS1110 pins are accessible through various
pins on the ADS1110 analog and digital connectors.
The ADS1110EVM is designed using a simple card format developed by TI.
This simple, consistent design makes the ADS1110EVM very easy to connect
to your own prototype system. You can even think of the ADS1110EVM as an
alternate package for the ADS1110one much larger than the device itself,
but also much easier to wire up by hand on your test bench.
The ADS1110EVM can be plugged directly into suitable motherboards such
as the HPA449 MSP430 microcontroller development system from Soft-
Baugh, Inc. (http://www.softbaugh.com/). See TI’s web site for example code
using the ADS1110EVM with the HPA449.
The ADS1110EVM, together with the HPA449 and the appropriate software,
also forms a complete evaluation system for verifying the performance of the
ADS1110. See the ADS1110 product information folder on the Texas Instru-
ments web site.
1.2 Connectors
The ADS1110 devices on the ADS1110EVM are connected through three
headers: the analog connector, the serial connector, and the power connector.
Pinouts and locations for the connectors are given in the following chapter.
-The analog connector (J1) carries analog I/O.
-The serial connector (J2) carries the ADS1110 I2C interface.
-Thepower connector (J4) carries the power supplies. The ADS1110EVM
requires a +2.7V+5V power supply. The power connector has dedicated
connections for +5V and +3.3V. A slide switch connects the four ADS1110
devices to the analog, +5V digital, or +3.3V digital power-supply pins on J6.
The board is designed using a single ground net connected to DGND. An
AGND pin is also provided; it can be connected to DGND using jumper J2.
A jumper is inserted in the supply line of each device. Another jumper carries
the supply current for all four devices. These jumpers allow the current of each
device to be measured independently or together.

Controls
1-3
Overview
1.3 Controls
The ADS1110EVM is configured using a slide switch and a jumper block.
Switch S1 is used to select between two digital power supply pins and one ana-
log power supply pin provided on the power connector. One pin is used for
+3.3V, and the other two are used for +5V; some motherboards, such as the
HPA449, provide both voltages. This switch determines the logic levels that
the ADS1110 will use to communicate, so it is important to set it correctly.
The jumper block is used mainly for current measurement. There is also a
jumper used to short AGND to DGND.
1.4 Setting Up
The ADS1110EVM is configured according to its use. Thus, there is no single
correct procedure to configure the test fixture.
Nevertheless, it is useful to remember the following things when you are set-
ting up the board:
-Make certain that S1, the power supply select switch, is in the right position
for your system, and that you have connected a power supply to the proper
pins on the power connector.
-If you are not measuring the ADS1110 supply current, remember to place
shorting blocks on jumper block J3. Without these shorting blocks, the
ADS1110 will not be powered on.

2-1
Circuit Description
 
This chapter describes the connectors, controls, and circuit design of the
ADS1110EVM in detail.
Topic Page
2.1 ADS1110 Devices 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2 I/O Connectors and Testpoints 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3 Jumpers 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.4 Switches 2-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 2

ADS1110 Devices
2-2
2.1 ADS1110 Devices
There are four ADS1110 devices installed on the ADS1110EVM. Each device
has a different I2C address. All four devices are connected to the same I2C bus.
The addresses and part numbers of each device are listed in Table 2−1.
Table 2−1.ADS1110 Devices
Reference Number Part Number I2C Address
U1 ADS1110A0 1001000
U2 ADS1110A1 1001001
U3 ADS1110A2 1001010
U4 ADS1110A3 1001011
Each ADS1110 has a bypass capacitor placed near the device power supply
pins. Although these capacitors are not strictly necessary, they can help per-
formance somewhat when using low-quality power supplies.
In many applications, one bypass capacitor (or none at all) may be sufficient
for a group of ADS1110 devices.
2.2 I/O Connectors and Testpoints
The positions and functions of the connectors and testpoints are shown in
Figure 2−1.
Figure 2−1.Connectors and Jumpers
ANALOG
CONNECTOR SERIAL
CONNECTOR
POWER
JUMPER BLOCK
POWER
CONNECTOR POWER
SELECT SWITCH
J1 J3
J4 S1
J2
Many of the pins on the connectors are not used. On the pinout diagrams, unused
pins are not marked. In the pin description tables, unused pins are not listed, and
ground pins are listed together, with the exception of the power connector.

J1: Analog Connector
2-3
Circuit Description
J1, J2, and J4, although each treated as a single connector, are actually
mounted as connector pairs in a pass-through configuration. Each pair has a
male surface-mount header on the top (component) side of the board, and a
corresponding female surface-mount socket on the bottom (solder) side of the
board. The headers, mounted on top, are suffixed A; the sockets, mounted on
bottom, are suffixed B.
In the schematic, the connector pairs are shown as one symbol. For J1, J2, and
J4, all bottom-side pins are connected to their corresponding top-side pins; for
example, J1B pin 1 connects to J1A pin 1, J1B pin 2 connects to J1A pin 2, etc.
This convention holds true for every pin on connectors J1, J2, and J4.
In the following descriptions, the connector pairs will be treated as a single
connector.
2.2.1 J1: Analog Connector
The analog connector pinout is shown in Figure 2−2 and described in
Table 2−2.
Figure 2−2.Analog Connector Pinout
1
3
5
7
9
11
13
15
17
19
2
4
6
8
10
12
14
16
18
20
VINP0VINN0
GND
GND
VINP1
VINP3
VINP2
VINN1
VINN2
VINN3
GND
GND
GND
Although certain pins are described as “negative,” never apply
voltages less than −0.3V to these pins. The ADS1110 is not a
bipolar-input device, and it cannot accept negative voltages below
−0.3V without damaging the functional operation of the unit.
The negative input pins are so named because the voltage on such
a pin is subtracted from a positive input pin during a reading.

J2: Serial Connector
2-4
Table 2−2.Analog Connector Pin Descriptions
Pin Number Pin Name Standard Name Direction Function
1 VINN0 AN0− Input Negative Analog Input, device U1
2 VINP0 AN0+ Input Positive Analog Input, device U1
3 VINN1 AN1− Input Negative Analog Input, device U2
4 VINP1 AN1+ Input Positive Analog Input, device U2
5 VINN2 AN2− Input Negative Analog Input, device U3
6 VINP2 AN2+ Input Positive Analog Input, device U3
7 VINN3 AN3− Input Negative Analog Input, device U4
8 VINP3 AN3+ Input Positive Analog Input, device U4
9, 11, 13, 17, 19 GND AGND Power Signal Ground
2.2.2 J2: Serial Connector
The serial connector pinout diagram is shown in Figure 2−3 and described in
Table 2−3.
Figure 2−3.Serial Connector Pinout
1
3
5
7
9
11
13
15
17
19
2
4
6
8
10
12
14
16
18
20 GND SCL
SDA
GND
GND
Table 2−3.Serial Connector Pin Descriptions
Pin
Number Pin Name Standard Name Direction Function
16 SCL SCL I/O I2C Clock Line
20 SDA SDA I/O I2C Clock Line
6, 12, 18 GND DGND Power Signal Ground
The ADS1110 I2C interfaces are connected through pins 16 and 20. The other
pins are not used.
Note: There are no pullup resistors on the I2C lines. These must be
connected externally.

J4: Power Connector
2-5
Circuit Description
2.2.3 J4: Power Connector
The power connector pinout diagram is shown in Figure 2−4 and described in
Table 4.
Figure 2−4.Power Connector Pinout
1
3 5 7 9
2 4 6 8
10
DGND
AGND
+1.8VD
+3.3VD
+5VA
+5VD
Table 2−4.Power Connector Pin Descriptions
Pin
Number Pin Name Function Usage on ADS1110EVM
1 +VA Positive Analog Supply,
+5V to +18V Optional Use as ADS1110 Power Supply
2 −VA Negative Analog Supply,
−5V to −18V Not Used
3 +5VA Positive Analog Supply,
+5V Not Used
4 −5VA Negative Analog Supply,
−5V Not Used
5 AGND Analog Ground Optional Connection to DGND
through J4 pins 11−12
6 DGND Digital Ground Ground
7 +1.8VD Positive Digital Supply,
+1.8V Not Used
8 VD1 Positive Digital Supply Not Used
9 +3.3VD Positive Digital Supply,
+3.3V Optional Use as ADS1110 Power Supply
10 +5VD Positive Digital Supply,
+5.5V Optional Use as ADS1110 Power Supply
The ADS1110EVM always uses DGND for its single ground domain. The
AGND pin may optionally be connected to DGND through jumper J2.

Jumpers
2-6
2.3 Jumpers
The jumper block, J3, is shown in Figure 2−5.
Figure 2−5.Jumper Block J3
1
3
5
7
9
11
2
4
6
8
10
12
ADC VDDU1 VDD ADC VDD
ADC VDD
ADC VDD
U2 VDD
U3 VDD
U4 VDD
AGND
VDD ADC VDD
GND
2.3.1 Individual Current Measurement Jumpers
Jumper block pins 1−8 are used to measure the current consumption of each
ADS1110 device individually.
For normal operation, short each pair together.
2.3.2 Total ADC Current Measurement Jumper
Jumper block pins 9−10 are used to measure the current consumption of all
four ADS1110 devices.
For normal operation, short this pair together.
2.3.3 Analog-Digital Ground Jumper
Jumper block pins 11−12 are used to connect the AGND pin on J4 (pin 5) to
the DGND pin on J4 (pin 6). The ADS1110EVM uses DGND as its ground.

Switches
2-7
Circuit Description
2.4 Switches
There is one switch on the ADS1110EVM. It selects the source pin for the
ADS1110 power supply.
2.4.1 S1: Power Supply Level
This switch selects from one of three power supply pins on J4 that can be used
to power the ADS1110 devices. The positions of the switch are described in
Table 2−5.
Table 2−5.Digital Power Supply Level Select Switch
Board Marking Switch Position Power Supply Source
+3.3VD Top +3.3V typical (J4 pin 9)
+5VD Middle +5V typical (J4 pin 10)
+5VA Bottom +5V typical (J4 pin 1)
This switch determines the logic level at which the devices will communicate.
Make certain it is set correctly before you power the board on.

3-1
Schematic and Layout
  
This chapter contains the complete bill of materials, schematic diagram, and
printed circuit board (PCB) layout for the ADS1110EVM.
The schematic diagram is shown in Figure 3−1 on page 3-2. The top
(component) side layout is shown in Figure 3−2 on page 3-3. The bottom
(solder) side layout is shown in Figure 3−3 on page 3-3. The bill of materials
is shown in Table 3−1 on page 3-4.
Note:
Board layouts are not to scale. These are intended to show how the board
is laid out; they are not intended to be used for manufacturing ADS1110EVM
PCBs.
Topic Page
3.1 Schematic 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2 Board Layout 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3 Bill of Materials 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 3