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User

s Guide

SBAU149B

–

June 2009

–

Revised May 2011

ADS1146EVM, ADS1246EVM, ADS1146EVM-PDK,

ADS1246EVM-PDK

ADS1246EVM (Left) and ADS1246EVM-PDK (Right)

This user's guide describes the characteristics, operation, and use of the ADS1146EVM and
ADS1246EVM, both by themselves and as part of the ADS1146EVM-PDK or ADS1246EVM-PDK. These
evaluation modules (EVMs) are evaluation boards for the

ADS1246

, a 24-bit delta-sigma analog-to-digital

converter (ADC), and the

ADS1146

, a 16-bit version of the ADS1246. The EVM allows evaluation of all

aspects of the ADS1146 or ADS1246 devices. Complete circuit descriptions, schematic diagrams, and a
bill of materials are included in this document.

The

following

documents

are

available

through

the

Texas

Instruments

web

site

http://www.ti.com

EVM-Compatible Device Data Sheets

Device

Literature Number

SBAU149B

–

June 2009

–

Revised May 2011

ADS1146EVM, ADS1246EVM, ADS1146EVM-PDK, ADS1246EVM-PDK

Submit Documentation Feedback

2009

–

2011, Texas Instruments Incorporated

Содержание ADS1146EVM

Страница 1: ...1246 The EVM allows evaluation of all aspects of the ADS1146 or ADS1246 devices Complete circuit descriptions schematic diagrams and a bill of materials are included in this document The following related documents are available through the Texas Instruments web site at http www ti com EVM Compatible Device Data Sheets Device Literature Number ADS1146 SBAS453 ADS1246 SBAS426A REF5020 SBOS410C OPA2...

Страница 2: ... Window 13 10 ADS1246EVM PDK Plug In Display Window 14 11 Connection Timeout 15 12 Firmware Download Message Box 15 13 Firmware Download Progress Indicator 16 14 Firmware Download Complete Message Box 16 15 I O Config Tab 18 16 Enabling VBIAS on a Channel 19 17 Cal Tab 21 18 About Tab 22 19 Progress Bar While Collecting Data 23 List of Tables 1 J8 J4 Analog Interface Pinout 4 2 J7 Serial Interface...

Страница 3: ...Pro For more information about ADCPro see the ADCPro Analog to Digital Converter Evalutation Software User s Guide literature number SBAU128 available for download from the TI web site This manual covers the operation of both the ADS1146 ADS1246EVM and the ADS1146EVM PDK ADS1246EVM PDK Throughout this document the abbreviation EVM and the term evaluation module are synonymous with the ADS1146 ADS1...

Страница 4: ...ons except J8 15 3 Digital Interface 3 1 Serial Data Interface The ADS1246EVM is designed to easily interface with multiple control platforms 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 J7 This header socket provides access to the digital control and serial data pins of the ADC Consult Samtec at http www samtec com...

Страница 5: ...ls on these pins 4 Power Supplies J3 is the power supply input connector Table 3 lists the configuration details for J3 Table 3 J3 Configuration Power Supply Input Pin No Pin Name Function Required J3 1 VA Unused No J3 2 VA Unused No J3 3 5VA 5V analog supply Always J3 4 5VA 5V analog supply Only in bipolar mode J3 5 DGND Digital ground input Yes J3 6 AGND Analog ground input Yes J3 7 1 8VD 1 8V d...

Страница 6: ...r the device from U1 filtered and buffered through U2 This 2 048V may be used to drive the REFP input or REFP can be connected to the external reference on J8 through switch S1 REFP should not be connected to AVDD through switch S1 because this connection will violate the specification for the maximum reference input Figure 1 shows switch S1 as it appears on the EVM The low side of the reference R...

Страница 7: ...e the following recommendations J6 should be removed if the external clock source is used and the TOUT pin is still driven by a processor in order to avoid conflicts Jumper J2 can be used to always select the U8 oscillator DVDD position or allow the onboard external clock selection to be controlled by GPIO5 J7 19 as shown in Figure 2 Figure 2 Jumper J2 7 EVM Operation This section provides informa...

Страница 8: ...e ADS1246EVM PDK including setup program installation and program usage To prepare to evaluate the ADS1246 with the ADS1246EVM PDK complete the following steps Step 1 Install the ADCPro software if not already installed on a PC Step 2 Install the ADS1246EVM PDK EVM plug in software Step 3 Complete the USB driver installation process Step 4 Set up the ADS1246EVM PDK Step 5 Connect the ADS1246EVM PD...

Страница 9: ...version on your CD Double click the file to run it then follow the instructions shown You can also utilize the ADCPro Update Check feature to check for newer versions of the ADS1246EVM PDK plug in once you have installed a version of it Follow the on screen prompts Once the ADCPro plug in installs you will be prompted to install the Virtual COM port driver as shown in Figure 4 Figure 4 Virtual COM...

Страница 10: ...p the ADS1246EVM PDK Step 1 Unpack the ADS1246EVM PDK kit Step 2 Set the switches on the MMB3 as described below as shown in Figure 6 Set switch SW4 to the right Set the DAC switch SW5 to the OUT position to the right Figure 6 MMB3 Switch Locations 10 ADS1146EVM ADS1246EVM ADS1146EVM PDK ADS1246EVM PDK SBAU149B June 2009 Revised May 2011 Submit Documentation Feedback Copyright 2009 2011 Texas Inst...

Страница 11: ...EVM into the MMB3 Check the pin alignment carefully before applying power to the PDK Step 4 Set the jumpers and switches on the ADS1246EVM as shown in Figure 3 note that these settings are the factory configured settings for the EVM 11 SBAU149B June 2009 Revised May 2011 ADS1146EVM ADS1246EVM ADS1146EVM PDK ADS1246EVM PDK Submit Documentation Feedback Copyright 2009 2011 Texas Instruments Incorpor...

Страница 12: ...bit digital to analog converter DAC that can be used as a signal source for an ADC under test and has a joystick for control of functions on the board when it is not controlled by a PC These features are experimental and not supported in the ADS1246EVM PDK at this time The MMB3 derives power from the USB interface and generates 5VD 3 3V and 1 8V as well as 5VA 5VA and 10V The 10V is supplied to th...

Страница 13: ...246EVM PDK plug in is included in the ADS1246EVM PDK package The program currently runs only on Microsoft Windows platforms of Windows XP Windows Vista is NOT supported If this is the first time installing ADCPro and plug ins follow these procedures to run ADCPro and perform any necessary firmware installations Make sure the ADCPro software and device plug in software are installed from the CD ROM...

Страница 14: ...play Window Step 3 The ADS1246EVM PDK plug in window has a status area at the top of the screen When the plug in is first loaded the plug in searches for the board You will see a series of messages in the status area indicating this action 14 ADS1146EVM ADS1246EVM ADS1146EVM PDK ADS1246EVM PDK SBAU149B June 2009 Revised May 2011 Submit Documentation Feedback Copyright 2009 2011 Texas Instruments I...

Страница 15: ...used Figure 11 Connection Timeout Step 5 The plug in detects whether or not the board has the correct firmware loaded The first time you use the ADS1246EVM PDK the firmware for the MMB3 may need to be downloaded to the MMB3 If the firmware must be loaded you will see a screen similar to that shown in Figure 12 Figure 12 Firmware Download Message Box 15 SBAU149B June 2009 Revised May 2011 ADS1146EV...

Страница 16: ...The firmware is saved in flash memory on the MMB3 so this operation should only need to be performed once Figure 13 Firmware Download Progress Indicator When the firmware download completes the message box shown in Figure 14 appears Follow the on screen instructions and the plug in should now connect to the EVM Figure 14 Firmware Download Complete Message Box 16 ADS1146EVM ADS1246EVM ADS1146EVM PD...

Страница 17: ...the ADS1246 It consists of a tabbed interface see Figure 15 with different functions available on different tabs These controls are described in this section You can adjust the ADS1246EVM settings when you are not acquiring data During acquisition all controls are disabled and settings may not be changed When you change a setting on the ADS1246EVM plug in the setting immediately updates on the boa...

Страница 18: ...unction of the multiplexer and power and reference settings in the ADS1246 The tab is divided into two sections I O Configuration and Supply Configuration Figure 15 I O Config Tab 18 ADS1146EVM ADS1246EVM ADS1146EVM PDK ADS1246EVM PDK SBAU149B June 2009 Revised May 2011 Submit Documentation Feedback Copyright 2009 2011 Texas Instruments Incorporated ...

Страница 19: ... of the supply You can test this option as shown in Figure 16 using one input tied to something close to ground make sure you observe the common mode restrictions listed in the ADS1246 device data sheet as a reference for this signal Figure 16 Enabling VBIAS on a Channel 19 SBAU149B June 2009 Revised May 2011 ADS1146EVM ADS1246EVM ADS1146EVM PDK ADS1246EVM PDK Submit Documentation Feedback Copyrig...

Страница 20: ...work properly drop down to the lower data rate and allow sufficient time to collect the data The BCS control sets the current level of the burnout current sources it may be set Off or to 0 5μA 2μA or 10μA The Power Down control powers down the ADS1246 Note that no data can be collected if the Power Down button is activated 9 1 1 2 Supply Configuration This section controls the selection of the pow...

Страница 21: ...m a self calibration the offset and full scale register values are then updated on the plug in screen You may also write to these registers by typing in hex values in the New fields then press the Set button You may read the values at any time by pressing the Read button 21 SBAU149B June 2009 Revised May 2011 ADS1146EVM ADS1246EVM ADS1146EVM PDK ADS1246EVM PDK Submit Documentation Feedback Copyrig...

Страница 22: ...cators show the version numbers of the plug in and firmware code respectively The ID indicator shows the value of the ID 3 0 bits in the ADS1246 ID register The Notes indicator may show relevant notes about the plug in or firmware code if there are any 22 ADS1146EVM ADS1246EVM ADS1146EVM PDK ADS1246EVM PDK SBAU149B June 2009 Revised May 2011 Submit Documentation Feedback Copyright 2009 2011 Texas ...

Страница 23: ...DS1246EVM PDK plug in disables all the front panel controls while acquiring and displays a progress bar as shown in Figure 19 Figure 19 Progress Bar While Collecting Data For more information on testing analog to digital converters in general and using ADCPro and Test plug ins refer to the ADCPro User Guide 23 SBAU149B June 2009 Revised May 2011 ADS1146EVM ADS1246EVM ADS1146EVM PDK ADS1246EVM PDK ...

Страница 24: ...0 1μF TDK C1608X7R1E104KT 10 25WV Size 0603 5 1 0 15μF C14 Capacitor X7R Ceramic 0 15μF Murata GRM188R71C154KA01 10 16WV Size 0603 D 6 6 10μF C16 C18 C19 Capacitor X5R Ceramic 10μF TDK C2012X5R0J106MT C21 C23 20 6 3WV Size 0805 7 2 47pF C24 C25 Capacitor C0G Ceramic 47pF TDK C1608C0G1H470JT 5 50WV Size 0603 8 1 10nF C20 Capacitor C0G Ceramic 10nF TDK C1608C0G1E103JT 5 25WV Size 0603 9 3 D1 D2 D5 D...

Страница 25: ...1 Through Hole Electronics 35 1 U1 Precision Voltage Reference Texas Instruments REF5020ID 2 048V 36 1 U2 Precision Operational Amplifier Texas Instruments OPA227U 37 1 U3 Texas Instruments PCA9535RGE 16 Bit I2 C I O Expander 38 1 U4 Inverter Single Gate Texas Instruments SN74AHCT1G04DBVR 39 1 U5 Buffer Open Drain Single Gate Texas Instruments SN74LVC1G07DBVRG4 40 1 U6 LDO Voltage Regulator 2 5V T...

Страница 26: ...UGHTER ANALOG J8A TOP SAM_TSM 110 01 L DV P J8B BOTTOM SAM_SSW 110 22 F D VS K IN 1 GND 2 EN 3 OUT 5 BYP 4 U6 TPS79225DBV Q1 FRC_FDN302P 2 4 5 3 U5 SN74LVC1G07DBV R8 100K 5V 5V Q3 FRC_FDN337N 5V 2 4 5 3 U4 SN74AHCT1G04DBV 5V 3 3V VA 2 5VA 4 AGND 6 VD1 8 5VD 10 VA 1 5VA 3 DGND 5 1 8VD 7 3 3VD 9 J3 DAUGHTER POWER ADC AVDD ADC AVSS DIGITAL 3 3V DGND AGND DVDD JUMPER FUNCTIONS D4 ONS_MMBZ5231BLT1 J3A ...

Страница 27: ... product This notice contains important safety information about temperatures and voltages For additional information on TI s environmental and or safety programs please contact the TI application engineer or visit www ti com esh 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 produc...

Страница 28: ...horized for use in safety critical applications such as life support where a failure of the TI product would reasonably be expected to cause severe personal injury or death unless officers of the parties have executed an agreement specifically governing such use Buyers represent that they have all necessary expertise in the safety and regulatory ramifications of their applications and acknowledge ...

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