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Texas Instruments ADS794xEVM User Manual Download Page 2

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2

SBAU194B – August 2011 – Revised September 2017

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Copyright © 2011–2017, Texas Instruments Incorporated

ADS794xEVM and ADS794xEVM-PDK

Contents

1

EVM Overview

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3

2

Analog Interface

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4

3

Digital Interface

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7

4

Power Supplies

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8

5

EVM Operation

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9

6

ADS794xEVM-PDK: Software Installation

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10

7

ADS794xEVM-PDK Kit Operation

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17

8

Bill of Materials, Board Layout, and Schematic

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20

9

Schematic

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24

List of Figures

1

ADS794xEVM and ADS7945 Analog Inputs

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5

2

ADS794xEVM and ADS7946 Analog Inputs

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6

3

ADS794xEVM Default Jumper Locations

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10

4

ADS794xEVM-PDK Plug-In Installer

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11

5

Completed ADS794xEVM-PDK Installer

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11

6

MMB0 Jumper Locations

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12

7

Connecting ADS794xEVM to MMB0

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13

8

Powering Up ADS794xEVM-PDK

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14

9

NI-VISA Driver Installation Prompt

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15

10

Loading ADS794xEVM Plug-in From ADCPro

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15

11

USBStyx Driver Installation Prompt

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16

12

ADS794xEVM Plug-in: Device Configuration Tab

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18

13

ADCPro Test Plug-ins

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19

14

ADS794xEVM PCB: Top Layer

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22

15

ADS794xEVM PCB: Ground Layer

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22

16

ADS794xEVM PCB: Power Layer

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23

17

ADS794xEVM PCB: Bottom Layer

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23

18

EVM Schematic

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24

List of Tables

1

Related Documentation

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1

2

P2: Analog Interface Pinout (Samtec 10 x 2)

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4

3

SMA Analog Inputs

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4

4

P1: Serial Interface Header

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7

5

P3 Configuration: Power-Supply Interface Header

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8

6

ADS794xEVM Bill of Materials

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20

Summary of Contents for ADS794xEVM

Page 1: ...dules EVMs allow evaluation of all aspects of either the ADS7946 or ADS7945 devices ADS794x Both devices are 14 bit dual channel ultralow power differential successive approximation register SAR analo...

Page 2: ...0 4 ADS794xEVM PDK Plug In Installer 11 5 Completed ADS794xEVM PDK Installer 11 6 MMB0 Jumper Locations 12 7 Connecting ADS794xEVM to MMB0 13 8 Powering Up ADS794xEVM PDK 14 9 NI VISA Driver Installat...

Page 3: ...t can be expanded easily with new test and data collection plug ins The ADS794xEVM PDK is controlled by a plug in running in ADCPro For more information about ADCPro see the ADCPro Analog to Digital C...

Page 4: ...d P2 4 A0 CH0 negative differential input for ADS7945 single ended input for ADS7946 P2 10 A1 OPEN CH1 positive differential input for ADS7945 open if ADS7946 is installed P2 12 A1 CH1 negative differ...

Page 5: ...M and ADS794xEVM PDK 2 1 ADS794xEVM Analog Inputs with ADS7945 Installed Each channel of the ADS7945 uses two OPA836 operational amplifiers to drive the fully differential inputs The input signals can...

Page 6: ...gle ended input voltage The input signals can be applied to either the SMA or P2 header connectors These operational amplifiers offset the input signal to use an inverting configuration with a single...

Page 7: ...only used to program the U4 EEPROM on the EVM board P1 2 P1 5 6 P1 8 9 P1 12 P1 14 15 and P1 17 Unused Unused 3 1 Serial Interface SPI The ADS794x ADC uses SPI serial communication in mode 0 CPOL 0 C...

Page 8: ...V analog power supply connected to P3 3 4 2 Digital Power Options The ADS794xEVM uses a jumper in J3 to connect the digital power supply to either 3 3 VD P3 10 or 5 VD P3 9 J3 in position 1 2 connects...

Page 9: ...nal range from 0 V to VREF for all EVM analog inputs In this mode the voltage read at the ADC is equal to VREF VIN Mode 2 DC Coupled Bipolar Inputs J6 Open DC coupled bipolar signals are typically pro...

Page 10: ...nal entry pin is P1 7 J1 2 3 The logic level is 3 3 V J3 2 3 The onboard 4 096 V is selected as the reference voltage J1 1 2 Analog input range is 0 V to VREF 4 096 V with dc coupled signals J6 closed...

Page 11: ...Refer to the ADCPro User Guide for instructions on installing and using ADCPro 6 2 Installing ADS794xEVM PDK Plug In Software The ADS794xEVM PDK plug in uses ADCPro you must install ADCPro before upl...

Page 12: ...connected Step 1 Unpack the ADS794xEVM PDK kit Step 2 Set the three jumpers on the MMB0 REV D as shown in Figure 6 Below Figure 6 there is a check list that explains the functionality of each jumper F...

Page 13: ...3 V The MMB0 uses 3 3 V logic to communicate with the ADS7945xEVM Step 5 Set jumper J1 on the ADS794xEVM to position 2 3 in order to place the CS signal in P1 7 of the EVM The MMB0 sends the CS signa...

Page 14: ...icates Figure 8 Powering Up ADS794xEVM PDK After the power supply is connected four green LEDs in the bottom right hand corner of the MMB0 motherboard should light up If these LEDs do not light up dis...

Page 15: ...drive with the ADCPro files Direct the PC to search the driver and install it by clicking Next at every prompt Figure 9 NI VISA Driver Installation Prompt 6 5 2 USBStyx Driver Installation The USBStyx...

Page 16: ...as previously installed on the PC the status area should show the message Select Device without prompting for the driver If this message appears close ADCpro and proceed to Section 7 Step 5 This drive...

Page 17: ...ontact Texas Instruments 7 2 Loading the ADS794xEVM PDK Plug in The ADS794xEVM PDK plug in for ADCPro provides complete control over all settings of the ADS794x You can adjust the ADS794xEVM settings...

Page 18: ...nput that must be set by the user to identify whether the ADS7945 or ADS7946 is installed on the board 2 Channel Select This user input selects the channel to be sampled 3 Data Rate This control shows...

Page 19: ...ata MultiHistogram This option acquires data and creates a histogram of code values MultiScope This feature acquires data and displays it in a graph of voltage vs time For further details regarding ho...

Page 20: ...226ML T 5 3 3 C5 C6 C29 Capacitor X7R Ceramic 10 6 3WV 0805 Taiyo Yuden JMK212B7106KG T 6 1 1 C8 Capacitor X7R Ceramic 10 10WV 0603 Murata GRM188R71A225KE15D 7 6 6 C9 C12 C16 C26 C27 C28 Capacitor C0G...

Page 21: ...Resistor Thick Film Chip 1 10W 0603 Panasonic ERJ 3GEY0R00V 0 2 R25 R29 26 3 3 T1 T2 T4 Test point PC Mini 040 D Red Keystone 5000 27 3 3 T5 T6 T7 Test point PC Mini 040 D Black Keystone 5001 28 1 1 T...

Page 22: ...ts Incorporated ADS794xEVM and ADS794xEVM PDK 8 2 Board Layouts Figure 14 through Figure 17 show the PCB layouts for the ADS794xEVM NOTE Board layouts are not to scale These figures are intended to sh...

Page 23: ...d Schematic 23 SBAU194B August 2011 Revised September 2017 Submit Documentation Feedback Copyright 2011 2017 Texas Instruments Incorporated ADS794xEVM and ADS794xEVM PDK Figure 16 ADS794xEVM PCB Power...

Page 24: ...16 10k R17 10k C15 2 2p C16 1000p C17 0 1u 1 2 3 4 5 6 U6 OPA836IDBVT R18 10k C18 2 2p C20 0 1u R20 4 99 R21 4 99 1 2 3 4 5 6 U7 OPA836IDBVT R22 10k R23 10k C21 2 2p C22 1000p C23 0 1u R26 4 99 R27 4...

Page 25: ...TE Page numbers for previous revisions may differ from page numbers in the current version Changes from A Revision February 2016 to B Revision Page Added missing schematic diagram 24 Changes from Orig...

Page 26: ...set forth above or credit User s account for such EVM TI s liability under this warranty shall be limited to EVMs that are returned during the warranty period to the address designated by TI and that...

Page 27: ...the antenna types listed in the user guide with the maximum permissible gain and required antenna impedance for each antenna type indicated Antenna types not included in this list having a gain great...

Page 28: ...t the EVM user 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 even with the...

Page 29: ...OST OF REMOVAL OR REINSTALLATION ANCILLARY COSTS TO THE PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES RETESTING OUTSIDE COMPUTER TIME LABOR COSTS LOSS OF GOODWILL LOSS OF PROFITS LOSS OF SAVINGS LOSS OF...

Page 30: ...TI Resource NO OTHER LICENSE EXPRESS OR IMPLIED BY ESTOPPEL OR OTHERWISE TO ANY OTHER TI INTELLECTUAL PROPERTY RIGHT AND NO LICENSE TO ANY TECHNOLOGY OR INTELLECTUAL PROPERTY RIGHT OF TI OR ANY THIRD...

Page 31: ...Mouser Electronics Authorized Distributor Click to View Pricing Inventory Delivery Lifecycle Information Texas Instruments ADS7945EVM PDK...

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