Texas Instruments ADS1178EVM Manual de usuario

User's GuideSBAU129C – November 2007 – Revised July 2008

ADS1178EVM, ADS1278EVM, ADS1178EVM-PDK, andADS1278EVM-PDK

ADS1178EVM (Left) and ADS1178EVM-PDK (Right)

This user's guide describes the characteristics, operation, and use of the ADS1178EVM andADS1278EVM, both by themselves and as part of the ADS1178EVM-PDK or ADS1278EVM-PDK. Theseevaluation modules (EVMs) are evaluation boards for the ADS1278 , a 24-bit multi-channel, delta-sigmaanalog-to-digital converter (ADC), and the ADS1178 , a 16-bit version of the ADS1278. The EVM allowsevaluation of all aspects of the ADS1178 or ADS1278 device. Complete circuit descriptions, schematicdiagrams, and bills of material are included in this document.

The following related documents are available through the Texas Instruments web site athttp://www.ti.com .

EVM-Compatible Device Data Sheets

Device Literature Number Device Literature Number

ADS1278 SBAS367A OPA1632 SBOS286AREF5025 SBOS410 SN74LVC2G157 SCES207KREF3125 SBVS046C TPS73018 SBVS054HOPA2350 SBOS099C TPS65131 SLVS493BADS1178 SBAS373A PCA9535 SCPS129H

ADCPro is a trademark of Texas Instruments.Microsoft, Windows are registered trademarks of Microsoft Corporation.I

C is a trademark of NXP Semiconductors, Inc.All other trademarks are the property of their respective owners.

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Contents1 EVM Overview ............................................................................................................... 42 Analog Interface .............................................................................................................. 43 Digital Interface .............................................................................................................. 54 Power Supplies .............................................................................................................. 75 Voltage Reference ........................................................................................................... 86 Power-Down, Mode, and Format Control ................................................................................. 97 Clock Source ................................................................................................................. 98 EVM Operation ............................................................................................................. 109 ADS1278EVM-PDK Kit Operation ....................................................................................... 1410 Evaluating Performance with the ADCPro Software ................................................................... 2711 Schematics and Layout .................................................................................................... 32
List of Figures
1 Connector J2 ................................................................................................................. 72 Connectors J15, J16 ........................................................................................................ 83 Connector J1 ................................................................................................................. 84 Switch S1 ..................................................................................................................... 95 Jumper J19 .................................................................................................................. 106 Amplifier Selection Switches .............................................................................................. 117 ADS1278EVM Default Jumper Locations ............................................................................... 138 MMB0 Initial Setup ........................................................................................................ 159 Connecting ADS1278EVM to MMB0 ................................................................................... 1610 Connecting an AC Adapter ............................................................................................... 1711 Laboratory Power-Supply Connection ................................................................................... 1812 NI-VISA Driver Installation ................................................................................................ 1913 NI-VISA Driver Installation Question ..................................................................................... 2014 NI-VISA Driver Installing ................................................................................................... 2015 NI-VISA Driver Complete Installation .................................................................................... 2116 NI-VISA Driver Verification Using Device Manager .................................................................... 2117 ADCPro Software Start-up Display Window ............................................................................ 2218 ADS1278EVM-PDK Plug-In Display Window........................................................................... 2319 Install New Driver Wizard Screen 1 ...................................................................................... 2420 Install New Driver Wizard Screen 2 ...................................................................................... 2421 Install New Driver Wizard Screen 3 ...................................................................................... 2522 Install New Driver Wizard Screen 4 ...................................................................................... 2523 Install New Driver Wizard Screen 5 ...................................................................................... 2624 USBSytx Driver Verification Using Device Manager ................................................................... 2625 Channel Enable............................................................................................................. 2726 Manual Channel Control ................................................................................................... 2827 Clock Settings and Mode .................................................................................................. 2928 Operating Mode ............................................................................................................ 3029 Output Data Format ........................................................................................................ 3030 Progress Bar While Collecting Data ..................................................................................... 31
List of Tables
1 J9/J7: Analog Interface Pinout ............................................................................................. 52 J8: Supplemental Analog Interface Pinout ............................................................................... 53 J5: Serial Interface Pins ..................................................................................................... 64 J3 Configuration: Power-Supply Input .................................................................................... 75 J15 +10V Selection .......................................................................................................... 86 J16 –10V Selection .......................................................................................................... 87 List of Switches ............................................................................................................. 13
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8 Operating Modes: Clock Frequency ..................................................................................... 289 ADS1278EVM Bill of Materials ........................................................................................... 32

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1 EVM Overview

1.1 Features

1.2 Introduction

2 Analog Interface

EVM Overview

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ADS1178EVM/ADS1278EVM Features:•Contains all support circuitry needed for the ADS1178/ADS1278•+10V and –10V generated from the +5V supply or supplied externally•Voltage reference options: external or onboard•Clock options: External clock source or 27MHz onboard crystal oscillator•GPIO access•Compatible with the TI Modular EVM System

ADS1178EVM-PDK/ADS1278EVM-PDK Features:•Easy-to-use evaluation software for Microsoft

Windows

XP•Data collection to text files•Built-in analysis tools including scope, FFT, and histogram displays•Complete control of board settings•Easily expandable with new analysis plug-in tools from Texas Instruments

For use with a computer, the ADS1178EVM-PDK or ADS1278EVM-PDK is available. This kit combinesthe ADS1178EVM/ADS1278EVM board with the DSP-based MMB0 motherboard, and includes ADCPro™software for evaluation.

The MMB0 motherboard allows the ADS1178EVM/ADS1278EVM to be connected to the computer via anavailable USB port. This manual shows how to use the MMB0 as part of theADS1178EVM-PDK/ADS1278EVM-PDK, but does not provide technical details about the MMB0 itself.

ADCPro is a program for collecting, recording, and analyzing data from ADC evaluation boards. It is basedon a number of plug-in programs, so it can be expanded easily with new test and data collection plug-ins.The ADS1178EVM-PDK/ADS1278EVM-PDK is controlled by a plug-in running in ADCPro. For moreinformation about ADCPro, see the ADCPro™ Analog-to-Digital Converter Evalutation Software User'sGuide (http://focus.ti.com/lit/ug/sbau128/sbau128.pdf ), available for download for the TI web site.

This manual covers the operation of both the ADS1178EVM/ADS1278EVM and theADS1178EVM-PDK/ADS1278EVM-PDK. Throughout this document, the abbreviation EVM and the termevaluation module are synonymous with the ADS1178EVM/ADS1278EVM. For clarity of reading, thismanual will refer only to the ADS1278EVM or ADS1278EVM-PDK, but operation of the EVM and kit forthe ADS1178 is identical, unless otherwise noted.

The ADS1278EVM is an evaluation module built to the TI Modular EVM System specification. It can beconnected to any modular EVM system interface card.

The ADS1278EVM is available as a stand-alone printed circuit board (PCB) or as part of theADS1278EVM-PDK, which includes an MMB0 motherboard and software. As a stand-alone PCB, theADS1278EVM is useful for prototyping designs and firmware.

Note that the ADS1278EVM has no microprocessor and cannot run software. To connect it to a computer,some type of interface is required.

For maximum flexibility, the ADS1278EVM is designed for easy interfacing to multiple analog sources.Samtec part numbers SSW-110-22-F-D-VS-K and TSM-110-01-T-DV-P provide a convenient 10-pin,dual-row, header/socket combination at J9. This header/socket provides access to the analog input pins ofthe ADS1278. Consult Samtec at http://www.samtec.com or call 1-800-SAMTEC-9 for a variety of matingconnector options. These signals can also be connected to the terminal block J7.

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3 Digital Interface

3.1 Serial Data Interface

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Digital Interface

In addition to J9 (and J7), terminal block J8 also provides additional analog inputs to accommodate thelarge number of input channels available on the ADS1278.

Most of the pins on J7, J8 and J9 are directly connected, with no filtering or protection. Use appropriatecaution when handling these pins. Table 1 and Table 2 summarize the pinouts for analog interfaces J9/J7and J8, respectively.

Table 1. J9/J7: Analog Interface Pinout

Pin Number Signal Description

J9.1, J7-2 A1N AINN1, ADS1278J9.2, J7-3 A1P AINP1, ADS1278J9.3, J7-4 A2N AINN2, ADS1278J9.4, J7-5 A2P AINP2, ADS1278J9.5, J7-6 A3N AINN3, ADS1278J9.6, J7-7 A3P AINP3, ADS1278J9.7, J7-8 A4N AINN4, ADS1278J9.8, J7-9 A4P AINP4, ADS1278J9.18 EXTREFN External Reference source input (– side ofdifferential input)J9.20 EXTREFP External Reference source input (+ side ofdifferential input)J9.10-16 (even) Unused —J9.15 Unused —J9.9-19 (odd), J7-1 AGND Analog ground connections (except J1.15)

Table 2. J8: Supplemental Analog Interface Pinout

Pin Number Signal Description

J8.1 GND Analog groundJ8.2 A5N AIN5N, ADS1278J8.3 A5P AIN5P, ADS1278J8.4 A6N AIN6N, ADS1278J8.5 A6P AIN6P, ADS1278J8.6 A7N AIN7N, ADS1278J8.7 A7P AIN7P, ADS1278J8.8 A8N AIN8N, ADS1278J8.9 A8P AIN8P, ADS1278

The ADS1278EVM is designed to easily interface with multiple control platforms. Samtec part numbersSSW-110-22-F-D-VS-K and TSM-110-01-T-DV-P provide a convenient 10-pin, dual-row, header/socketcombination at J5. This header/socket provides access to the digital control and serial data pins of theADC. Consult Samtec at http://www.samtec.com or call 1-800-SAMTEC-9 for a variety of matingconnector options.

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3.2 Data Output

Digital Interface

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All logic levels on J5 are 3.3V CMOS, except for the I

C™ pins. These pins conform to 3.3V I

C rules.Table 3 describes the J5 serial interface pins.

Table 3. J5: Serial Interface Pins

Pin No. Pin Name Signal Name I/O Type Pullup Function

J5.1 CNTL SYNC In High —J5.2 GPIO0 MODE0 In High —J5.3 CLKX SCLK In None ADS1278 SPI clockJ5.4 DGND DGND In/Out None Digital groundJ5.5 CLKR CLKR Out None SCLK clockJ5.6 GPIO1 MODE1 In High —J5.7 FSX DRDY/FSYNC In/Out Low —J5.8 GPIO2 FORMAT0 In High —J5.9 FSR DRDY/FSYNC In/Out None —J5.10 DGND DGND In/Out None Digital groundJ5.11 DX DIN In None ADS1278 SPI datainJ5.12 GPIO3 FORMAT1 In High —J5.13 DR DOUT1 Out None ADS1278 data outJ5.14 GPIO4 FORMAT2 In None —J5.15 /INT DRDY/FSYNC Out None —J5.16 SCL SCL I

C N/A I

C clockJ5.17 TOUT CLK In None Can be used toprovide a clock froma processorJ5.18 DGND DGND In/Out None Digital groundJ5.19 GPIO5 CLK Select — None —J5.20 SDA SDA I

C N/A I

C data

Many pins on J5 have weak pull-up/down resistors. These resistors provide default settings for many ofthe control pins. Many pins on J5 correspond directly to ADS1278 pins. See the ADS1278 product datasheet for complete details on these pins.

Most data communications are directed through DOUT1. The data from all eight channels can beobserved on the DOUT1 pin using the TDM mode. That is the signal that is used by theADS1278EVM-PDK to read back and display all the channels. All the data output signals (DOUT1 toDOUT8) can be monitored on J2. Figure 1 illustrates the pinout for J2.

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4 Power Supplies

4.1 Bipolar Power Options

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Power Supplies

Figure 1. Connector J2

J3 is the power-supply input connector. Table 4 lists the configuration details for J3. Analog inputs to theADC can be applied directly to the device (see Section 8.1 ,Analog Input), bypassing the onboardamplifiers, and in this case only +5V and +3.3V are required to power the EVM. If the amplifiers are used,an additional bipolar supply is needed to power them. The EVM includes a switching power supply togenerate a +10V and –10V supply. For optimum noise performance, the external supplies (+VA and –VA)should be used.

Table 4. J3 Configuration: Power-Supply Input

Pin No. Pin Name Function Required

J3.1 +VA +10V to +15V Yes, unless onboard +10V isused.J3.2 –VA -10V to –15V Yes, unless onboard –10V isused.J3.3 +5VA +5V analog supply AlwaysJ3.4 –5VA –5V analog supply NoJ3.5 DGND Digital ground input YesJ3.6 AGND Analog ground input YesJ3.7 +1.8VD 1.8V digital supply NoJ3.8 +3.3VD 3.3V digital supply AlwaysJ3.9 VD1 Not used NoJ3.10 +5VD +5V Used to generate +10V/–10V

The 1.8V for DVDD comes from the voltage regulator U16 using 3.3V as the source voltage input.

All of the power supplies AVDD (+5V), DVDD (1.8V), and IOVDD (3.3V) have corresponding jumpers J10,J11 (AVDD), J13 (DVDD) and J14 (IOVDD) that can be replaced with a current meter to measure therespective supply currents.

J15 and J16 require a jumper to select the voltage used by the onboard amplifiers. The external voltagescan range from 10V to 15V. The onboard voltage is always 10V. Table 5 and Table 6 list the options forJ15 and J16, respectively. Figure 2 shows the pinout for connectors J15 and J16.

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5 Voltage Reference

Voltage Reference

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Table 5. J15 +10V Selection

Jumper Name Function

1-2 (OB) +10V Select the +10V that isgenerated on the EVM2-3 (EXT) +VA Select the external +VA voltage

Table 6. J16 –10V Selection

Jumper Name Function

1-2 –10V Select the –10V that is generatedon the EVM2-3 –VA Select the external –VA voltage

Figure 2. Connectors J15, J16

The ADS1278EVM has three sources for the reference voltage. Jumper J1 can select the voltage fromeither the REF3125 (U1) or REF5025 (U2). The reference from either source is filtered and buffered byU3A. Switch S1 chooses either the onboard reference or the external reference voltage that is connectedto the reference pins of J9. Figure 3 illustrates the pinout for connector J1. Figure 4 shows switch S1 as itappears on the EVM.

Figure 3. Connector J1

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6 Power-Down, Mode, and Format Control

7 Clock Source

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Power-Down, Mode, and Format Control

Figure 4. Switch S1

The ADS1278 has several pins to control the power-down of individual channels, and mode and format forthe digital interface. These pins are controlled on the EVM either through software or hardware (usingswitches S10 and S11).

For users of the ADS1278EVM as a stand-alone module, these pins may be pulled high or low throughDIP switches S10 and S11. Refer to the ADS1278 product data sheet for complete details on these pinsand which state sets which options.

For use in the ADS1278EVM-PDK, the state of these pins is controlled by software, using the I

C portexpander on the EVM. When used in the ADS1278EVM-PDK, the DIP switches S10 and S11 must all beswitched so that they are down, toward the center of the board. The ADS1278EVM-PDK software willcheck at startup to verify that these switches are set correctly, and will generate an error message if theyare not. However, it cannot detect if the switches are changed after startup.

CAUTION

When using the EVM as part of the ADS1278EVM-PDK, the DIP switches S10and S11 must all be switched so that they are down, toward the center of theboard. Failure to do so may damage the EVM.

The ADS1278 clock can come from one of several sources: the onboard 27MHz crystal oscillator, a clocksupplied by a processor on the TOUT pin (J5.17), or an external clock source connected to J18.1 (ground)and J18.2 (signal).

If the onboard 27MHz oscillator is selected, the device can be run in the high-speed mode, thehigh-resolution mode, the low-power mode, or low-speed modes with CLKDIV set to 1. If the performanceof the device must be explored with CLKDIV set to 0 in the low-power and low-speed modes, an externalclock must be provided to the board, either using the TOUT connection or having an external clock sourceconnected to J18. The same condition is true if frequencies other than the 27MHz provided by theonboard oscillator must be investigated.

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7.1 Usage in PDK

7.2 Usage as a Stand-Alone EVM

8 EVM Operation

8.1 Analog Input

EVM Operation

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If using the ADS1278EVM as part of the ADS1278EVM-PDK, J19 should not have any pins shorted.Remove any shorting blocks on jumper J19. The ADS1278EVM-PDK software will allow selection of theclock source under software control (this is accomplished by using port 05 of the I

C expander U17). Thesoftware allows selection of the onboard 27MHz oscillator, or a clock provided by a PLL on the MMB0 thatdirectly drives the appropriate CLK pins of the interface, or an external, customer-supplied clock. If anexternal clock is selected with the software, this clock must be provided on J18. Note that if the externalclock is selected and no clock is provided, the software may hang waiting for data from the converter.

If using the EVM in your own system and not with the PDK hardware and software, observe the followingrecommendations:

•J17 should be removed if the external clock source is used and the TOUT pin is still driven by aprocessor in order to avoid conflicts.•Jumper J19 can be used to always select the 27MHz crystal (IOVDD position) or allow theonboard/external clock selection to be controlled by GPIO5 (J5.19), as shown in Figure 5 .

Figure 5. Jumper J19

The following section provides information on the analog input, digital control, and general operatingconditions of the ADS1278EVM.

Four of the analog input sources (channels 1–4) can be applied directly to J9 (top or bottom side) orthrough signal-conditioning modules available for the the modular EVM system. Terminal block J7 isconnected in parallel with the analog signal connections to J9. The additional four channel sources (5-8)can be applied to the terminal block J8.

Each input signal can be selected to connect directly to the analog inputs of the ADS1278 or they can usethe OPA1632 buffers that are provided. Switches S2–9 can be switched away from the ADS1278 to selectthe Terminal Block (TBK) or towards the ADS1278 to select the Amplifier (AMP) for the analog inputs 1through 8, as shown in Figure 6 .

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