Texas Instruments ADS1625 EVM User Manual
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Texas Instruments ADS1625 EVM User Manual

Texas Instruments ADS1625 EVM User Manual

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ADS1625 and ADS1626 EVM
User's Guide
December 2003
Data Acquistion
SLAU123

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Summary of Contents for Texas Instruments ADS1625 EVM

  • Page 1 ADS1625 and ADS1626 EVM User’s Guide December 2003 Data Acquistion SLAU123...
  • Page 2 TI product or service and is an unfair and deceptive business practice. TI is not responsible or liable for any such statements. Following are URLs where you can obtain information on other Texas Instruments products & application solutions:...
  • Page 3 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.
  • Page 4 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...
  • Page 5 Information About Cautions and Warnings Preface Read This First About This Manual This user’s guide describes the characteristics, operation, and use of the ADS1625/26 EVM 18-bit Analog-to-Digital Evaluation Board. A complete cir- cuit description as well as schematic diagram and bill of materials are included. Contact the Product Information Center or e-mail dataconvapps@list.ti.com for questions regarding this EVM.
  • Page 6 Trademarks TI Logo, TMS320C2000, TMS320C5000, TMS320C6000, and Code Composer Studio are trademarks of Texas Instruments.

  • Page 7: Table Of Contents

    Contents Contents EVM Overview ..............Features .
  • Page 8 Contents Figures 1−1 Default Configuration Used by the EVM ......... 1−2 Block Diagram .

  • Page 9: Evm Overview

    Chapter 1 EVM Overview Topic Page Features ............Introduction .

  • Page 10: Analog Interface

    Basic system-level logic decoding. 1.2 Introduction The ADS1625 EVM is a high speed, high-resolution, delta sigma (∆Σ) analog-to- digital converter. It features a data rate of 1.25 MSPS, a bandwidth (−3 dB) of 615 kHz and a passband ripple of less than ±0.0025 dB.

  • Page 11: Default Configuration Used By The Evm

    Analog Input 1.4 Analog Input Various options are available to deliver the signal to the ADC: Single-ended via SMA connector at J6. Single-ended via socket strip/header at J1/P1 connector. Differentially via socket strip/header at J1/P1 connector. The default configuration used by the EVM is shown in Figure 1−1. It provides a convenient method to convert a single-ended bipolar signal into a differential signal.

  • Page 12: Block Diagram

    Modulator Clock Figure 1−2 shows a block diagram of the configuration. Figure 1−2. Block Diagram REF+ Gain = 1 (REF+) + (REF−) Gain = 1 To ADC 8 V − 40 V Reference REF− Gain = 1 Gain = 1 To Analog Input 1.6 Modulator Clock The ADS1625 and ADS1626 partition the modulator clock as part of the analog...

  • Page 13: Digital Interface

    Chapter 2 Digital Interface This chapter describes the EVM digital interface consists of the following subsections: Topic Page Board-Level Control ......... . . External Interface .

  • Page 14: Switch Function Control

    Board-Level Control 2.1 Board-Level Control 2.1.1 DIP Switch Options The optional settings for the ADS1625/26 are set and controlled manually via a DIP switch – SW1. The functions controlled by this switch are summarized below. Table 2−1. Switch Function Control Switch Factory-Set Condition Position...

  • Page 15: Resetting The Ads1625 And Ads1626

    Board-Level Control 2.1.3 Resetting the ADS1625 and ADS1626 The ADS1625 and ADS1626 are synchronously reset on the EVM when the RESET pin is asserted LOW. This can be accomplished by issuing a write command (WR) via the host system or momentarily depressing switch SW2. Whichever option is chosen, the reset signal is then synchronized with the modulator clock and is available for application to the RESET pin of the device.

  • Page 16: Arrangement Of Dsk, Interface Card And Evm

    External Interface Table 2−4. Memory Space Address Address Selected 1−2 3−4 0xA0000000 0xA0000004 0xA0000008 0xA000000C 2.2 External Interface The pinout for the EVM has been arranged to easily mate with a growing range of interface adapters. The premise of this arrangement is to ensure a high degree of modularity without committing the EVM to be used in only one particular platform.

  • Page 17: Assignment And Function At

    Data Connector Pinout 2.3 Data Connector Pinout The data from the ADC is available at J2/P2. The assignment and function of each pin is given in Table 2−5. Table 2−5. Assignment and Function at J2/P2 Pin Number Function Pin Number Function IO Ground IO Ground...

  • Page 19: Power Connector

    Chapter 3 Power Distribution The ADS1625/26EVM board requires various power sources for operation. A dual ±6-V dc supply Two 5-V dc supply A single 3-V dc supply A single 8-V – 40-V dc supply The simplest way to provide these voltages is to use the power connector P4/J4 and derive the voltages elsewhere, preferably via linear supplies.

  • Page 21: Getting The Most From Your Evm

    Chapter 4 Getting the Most From Your EVM Generally, the user can take two hardware directions with the EVM. Topic Page Stand-Alone EVM ..........DSP Interface .

  • Page 22: Stand-Alone Evm

    . For the example programs available with the ADS1625 EVM, the plug-in is not needed, as all the files are provided. The program itself performs the following steps: Initialization of global variables by calling the function dc_configure() with the settings of the ADS1625.

  • Page 23: Jumper Settings For J13 And J14 On The 5−6K Interface Card

    DSP Interface In order to get the expected result, the following steps need to be performed. Make sure that the jumpers on the 5−6K interface card are set according to the following Table 4−1 and Figure 4−1. Table 4−1. Jumper Settings for J13 and J14 on the 5−6K Interface Card Position Reference Designator 1−2...

  • Page 24: Ccs Project Menu

    DSP Interface Figure 4−2. CCS Project Menu Figure 4−3. CCS Project Open Dialog Once the project is open, expand the project tree by clicking on the (+) in front of it and expand the source files as well. The project window should in Figure 4−4.

  • Page 25: Ccs Project View

    DSP Interface Figure 4−4. CCS Project View Next, load the executable program provided into the DSP by clicking on File " Load Program and selecting the file ADS1625−CXXXX.out from the Debug submenu, where the XXXX in the filename stands for the plat- form you use (5510, 6711, 6713, 6416).

  • Page 26: Ccs Context Menu

    DSP Interface Figure 4−5. CCS Context Menu With this done, a new dialog window with the properties of the graph appears. Here, a few values must be entered, whereas most of the settings can be left in the default position: Start Address: This is the starting location of the acquisition buffer containing the data to be graphed.

  • Page 27: Ccs Graph Property Windows

    DSP Interface Sampling Rate (Hz): This field contains the sampling frequen- cy for acquisition buffer samples, such as for analog to digital conversion. The sampling rate is used to calculate the time and frequency values displayed on the graph. For a time domain graph, this field calculates the values for the time axis.

  • Page 28: Ccs Window With Graph

    DSP Interface Figure 4−7. CCS Window With Graph...

  • Page 29: Evm Bom, Ads1625/26 Evm Layouts And Schematics

    Chapter 5 EVM BOM, ADS1625/26 EVM Layouts, and Schematics This chapter contains the bill of material, EVM layouts, and the schematics for the ADS1625/26. Topic Page EVM Bill of Materials ......... . ADS1625/26 EVM Layout Details .

  • Page 30: Ads1625 Bill Of Materials

    EVM Bill of Materials 5.1 EVM Bill of Materials The following tables contains a complete Bill of Materials for the ADS1625 and ADS1626 EVM. Table 5−1. ADS1625 Bill of Materials Value Ref Des Description Vendor Part number 0.001 µF C6, C9, C16, Capacitor ceramic 1000 pF AVX Corporation 06035A102JAT2A...
  • Page 31 EVM Bill of Materials Value Ref Des Description Vendor Part number 2.2 µF Capacitor ceramic 2.2 µF Panasonic ECJ-2FB1A225K 10 V X5R 080 2 Position jumper _ 0.1” Samtec TSW-102-07-L-S spacing 3.01 K R2, R19 SMD thin film chip resistor KOA Speer RN732ALTD3011B25 0805 3.01 K 0.1% 25 PPM...
  • Page 32 R13, R17, R21, R22, R23, R25, R26, R27, R28, R29, ADS1625 PWB 6455115 IC 16 Bit 1.25 MSPS ADC Texas Instruments ADS1625IPAPT 64-TQFP Switch dip 8 pos halh pitch ITT Industries TDA08H0SK1 J1, J3 2 x 10 x 0.1 SMT...
  • Page 33 142-0701-301 Components Inc. Red LED, SMT 1206 Chicago Miniature CMD15-21VRC/TR8 Lamp Co. U10, U15 IC single inverter gate Texas Instruments SN74AHC1G04DBVR SOT23-5 IC SGL 2 in pos-or gate Texas Instruments SN74AHC1G32DBVR SOT23-5 U7, U9 IC SGL 2 in ex-or gate...

  • Page 34: Ads1626 Bill Of Materials

    EVM Bill of Materials Table 5−2. ADS1626 Bill of Materials Value Ref Des Description Vendor Part number 0.001 µF C6, C9, C16, Capacitor ceramic 1000 pF AVX Corporation 06035A102JAT2A C17, C66 5% 50 V NP0 0603 0.01 µF C1, C22, C28, Capacitor 10000 pF 50 V Kemet C0603C103J5RACTU...
  • Page 35 EVM Bill of Materials Value Ref Des Description Vendor Part number W1, W2, W3, 3-position jumper Samtec TSW-103-07-L-S W4, W5, W7, W8, W9, W10, 4.7 µF Capacitor 4.7 µF/10 V C42, C48, Panasonic ECS-H1AX475R TEH SER SMD 4.12 K R3, R18 Thin film chip resistor, 0805 KOA Speer RN732ALTD4121B25...
  • Page 36 R21, R22, R23, R25, R26, R27, R28, R29, ADS1626 PWB 6455115 IC 16 Bit 1.25 MSPS ADC Texas Instruments ADS1626IPAPT 64-TQFP W FIFO Switch dip 8 pos halh pitch ITT Industries TDA08H0SK1 J1, J3 2 x 10 x 0.1 SMT...
  • Page 37 EVM Bill of Materials Value Ref Des Description Vendor Part number IC SGL 2 in pos-or gate Texas Instruments SN74AHC1G32DBVR SOT23-5 U7, U9 IC SGL 2 in ex-or gate Texas Instruments SN74AHC1G86DBVR SOT23-5 IC quad 2-in pos-or gate Texas Instruments...

  • Page 38: Top Tracking Layer

    ADS1625/26 EVM Layout Details 5.2 ADS1625/26 EVM Layout Details Figure 5−1. Top Tracking Layer 5-10...

  • Page 39: Internal Power And Ground Layers

    ADS1625/26 EVM Layout Details Figure 5−2. Internal Power and Ground Layers EVM BOM, ADS1625/26 EVM Layouts, and Schematics 5-11...

  • Page 40: Bottom Tracking Layer

    ADS1625/26 EVM Layout Details Figure 5−3. Bottom Tracking Layer 5-12...

  • Page 41: Ads1625/26 Evm Schematics

    ADS1625/26 EVM Schematics 5.3 ADS1625/26 EVM Schematics The schematics are shown on the following pages. EVM BOM, ADS1625/26 EVM Layouts, and Schematics 5-13...
  • Page 42 Revision History ECN Number Approved Analog Input J2/P2 Data bus buffers ADS1625_26 J1 / P1 EXT_CLK AIN_N IO_GND AINP AINP AINN AINN REF+ VCOM VREFP REF- REF+ VCOM VMID AGND REF- VREFN B_DRDY B_DRDY DRDY B_OTR B_OTR 40-PIN HEADER IO_GND Interface (2 of 2) REFEN* REFEN*...
  • Page 43 Revision History ECN Number Approved VREFN 10uF 0.1uF 22uF AGND MOD_AVDD IOVDD DVDD3.0V 22uF 0.1uF MOD_AGND IO_GND IO_GND VMID 0.1uF 0.1uF 0.1uF IOVDD 10uF 0.1uF IOVDD 2.2R 22uF AGND 220uH C101 VREFP 0.1uF 0.1uF AGND IO_GND IO_GND 10uF 0.1uF 49.9R AGND EXT_CLK AGND...
  • Page 44 22pF AINP 49.9R 100pF OPA2822U .01uF AGND AGND 22pF 390pF 49.9R 22uF 0.1uF 0.1uF 10uF AGND AGND AGND AGND OPA2822U .01uF AINN 49.9R 0.1uF 10uF AIN_N 100pF AGND AGND 12500 TI Boulevard. Dallas, Texas 75243 Title: ADS1625 / 26 Analog Input Engineer: Joe Purvis DOCUMENTCONTROL #...
  • Page 45 .001uF AGND .01uF 10uF AGND VREFP OPA2822U 10uF .01uF 4.12K VREF AGND 10uF .01uF +12v 10uF .01uF AGND TEMP TRIM 0.1uF 2.2uF 10uF 0.1uF 0.01uF AGND 9.09K VMID REF02 .001uF AGND AGND AGND OPA2822U 3.01K 10uF .01uF .01uF 10uF .001uF AGND AGND AGND...
  • Page 46 IOVDD C108 C111 0.1uF IO_GND SN74AHC541 IO_GND IOVDD C107 C110 0.1uF IO_GND SN74AHC541 IO_GND IOVDD C106 C109 0.1uF IO_GND B_DRDY B_OTR DRDY 12500 TI Boulevard. Dallas, Texas 75243 IO_GND SN74AHC541 Title: ADS1625 / 26 Data Bus Buffers Engineer: Joe Purvis DOCUMENTCONTROL # REV: 6455116...
  • Page 47 IOVDD HOST_A2 SN74AHC1G86 ADDR_VALID* SN74AHC1G32 HOST_A3 IOVDD IOVDD REFEN* SN74AHC1G86 SEL_FIFO(0) SEL_FIFO(1) SEL_FIFO(2) DIP_SWITCH_8POS IO_GND IOVDD IO_GND 130K U15A DRDY 169K SN74AHC1G04 DRDY_OUT IOVDD C104 0.1uF IOVDD IO_GND IOVDD ADS1605_CS* U11C U11A 100R ADDR_VALID* SN74AHC74 HOST_CSa* RESET* SN74AHC74 SN74AHC32 HOST_WR* SN74AHC32 IO_GND HOST_WR*...
  • Page 48 Revision History ECN Number Approved 220uH DVDD3.0V 47uF .001uF 0.1uF 47uF 10uF 0.1uF AGND 47uF IO_GND 220uH IOVDD 47uF 4.7uF 0.1uF +5VD AVDD IO_GND 47uF 4.7uF 0.1uF AGND MOD_AVDD MOD_AGND DGND IO_GND1 AGND1 220uH IO_GND DVDD3.0V 47uF 4.7uF 0.1uF AGND IO_GND MOD_AGND AGND...
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