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SLWU055A – May 2008 – Revised May 2016

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Copyright © 2008–2016, Texas Instruments Incorporated

TSW3070EVM: Amplifier Interface to Current Sink DAC - Arbitrary Waveform

Generator Demonstration

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User's Guide

SLWU055A – May 2008 – Revised May 2016

TSW3070EVM: Amplifier Interface to Current Sink DAC -

Arbitrary Waveform Generator Demonstration

The TSW3070 is an evaluation module (EVM) that shows how to use an active interface with the current
sink output of the DAC5682Z. The EVM includes the DAC5682Z for digital-to-analog conversion, an
OPA695 to demonstrate an active interface implementation using a wide bandwidth operational amplifier
and a THS3091 and THS3095 to showcase an operational amplifier with large voltage swing. Also
included on board are a CDCM7005, VCXO and Reference for clock generation, and linear regulators for
voltage regulation. Communication to the EVM is accomplished via a USB interface and GUI software.

TSW3070EVM

Contents

1

TSW3070EVM Configuration Options

....................................................................................

1.1

DAC Component

....................................................................................................

1.2

Board Configuration

................................................................................................

1.3

VCXO

.................................................................................................................

2

Block Diagrams

..............................................................................................................

2.1

System Block Diagram

.............................................................................................

3

Key Texas Instruments Components

.....................................................................................

3.1

CDCM7005

..........................................................................................................

3.2

DAC5682Z

...........................................................................................................

3.3

TPS76xxx, TPS5430, UCC284-5

.................................................................................

3.4

OPA695, THS3091, THS30915

...................................................................................

4

Software Installation

.........................................................................................................

4.1

DAC5682Z USB Control Software Installation

..................................................................

4.2

DAC5682Z EVM Driver Installation

...............................................................................

5

Software Introduction

........................................................................................................

5.1

Modes of Operation

...............................................................................................

1
2
3
...
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Summary of Contents for DAC5682Z

Page 1: ...te an active interface implementation using a wide bandwidth operational amplifier and a THS3091 and THS3095 to showcase an operational amplifier with large voltage swing Also included on board are a CDCM7005 VCXO and Reference for clock generation and linear regulators for voltage regulation Communication to the EVM is accomplished via a USB interface and GUI software TSW3070EVM Contents 1 TSW307...

Page 2: ...ircuit Board Layout 27 10 1 Design Resources 27 List of Figures 1 Block Diagram 4 2 Home Menu Showing EVM Status 10 3 DAC5682Z Register Configuration and Block Diagram Menu 11 4 DAC5682Z Register and CDCM7005 Configuration Menu 12 5 DAC5682Z Register Configuration and TSW3100 Pattern Generator Control Menu 13 6 TSW3070EVM Driven by TSW3100 Pattern Generator 18 7 Typical THS3091 and THS3095 Voltage...

Page 3: ...enerally acceptable with no degradation in performance The OPA circuits have been designed to have a combined output gain of 2 2x whereas the THS3091 and THS3095 circuit has a gain of 3 3x The resistor networks and gain can be modified as necessary for custom applications However special care must be taken to ensure that the 3 3 Vdc common mode voltage is maintained at the DAC output and the DAC c...

Page 4: ...e by 16 can be replaced with a divide by 4 or 8 with a 90 degree phase shift if desired This device is used to lock the onboard 800 MHz VCXO and 10 MHz reference For further information about the CDCM7005 device see the device data sheet SCAS793 3 2 DAC5682Z The DAC5682Z is a 16 bit interpolating dual digital to analog converter DAC with a high speed LVDS data interface The device incorporates a d...

Page 5: ... higher external operational amplifier supplies The amplifier circuits can be further optimized by following the guidelines in the application report SBAA135 This optimization can be performed once the final filter and gain components have been selected 4 Software Installation The enclosed CD ROM contains all of the necessary software that is needed for the host personal computer PC to control the...

Page 6: ...s Incorporated TSW3070EVM Amplifier Interface to Current Sink DAC Arbitrary Waveform Generator Demonstration The destination directory for the installer is displayed It is recommended to leave the default folder location Any necessary folders are created by the installation if they do not exist Click Next Accept the EULA and click Next ...

Page 7: ...2016 Submit Documentation Feedback Copyright 2008 2016 Texas Instruments Incorporated TSW3070EVM Amplifier Interface to Current Sink DAC Arbitrary Waveform Generator Demonstration Click Next again to start the installation Click Continue to complete the installation ...

Page 8: ...r Demonstration Restart the PC as directed 4 2 DAC5682Z EVM Driver Installation Once the PC has restarted connect the provided USB cable to the PC and connector J13 of the EVM Power up TSW3070EVM using the provide 6 V power supply After power is applied the USB driver installation process will start The hardware wizard detects the EVM When asked if it should connect to the update server to locate ...

Page 9: ...to complete the driver installation If a DAC5682 EVM driver has been previously installed Windows Hardware Wizard may not require the drivers to be installed and these steps will not be required The software can now be started from Start All Programs Texas Instruments DACs DAC5682z EVM Control 5 Software Introduction The DAC5682Z EVM control software allows you to Configure the DAC5682Z and CDCM70...

Page 10: ...ngs DAC5682Z data path and help window 5 2 Software Boxes The DAC5682Z software interface controls are divided into boxes The functionality of these boxes is described in Table 2 Table 2 Software Box Descriptions Box Description Menu Switch between main functionality settings Home Show serial information and EVM status USB Readback Reset the USB port to begin a new data session Disable DAC5682Z re...

Page 11: ...Revised May 2016 Submit Documentation Feedback Copyright 2008 2016 Texas Instruments Incorporated TSW3070EVM Amplifier Interface to Current Sink DAC Arbitrary Waveform Generator Demonstration Figure 3 DAC5682Z Register Configuration and Block Diagram Menu ...

Page 12: ...08 Revised May 2016 Submit Documentation Feedback Copyright 2008 2016 Texas Instruments Incorporated TSW3070EVM Amplifier Interface to Current Sink DAC Arbitrary Waveform Generator Demonstration Figure 4 DAC5682Z Register and CDCM7005 Configuration Menu ...

Page 13: ...rview Table 3 contains a complete reference of all the software controls Table 3 Software Feature Descriptions Control Name Input Output Description MENU BOX EVM Home Input Displays EVM Home Box DAC5682Z Diagram Input Displays DAC5682Z Register Configuration and DAC5682Z Diagram boxes Register Config Input Displays DAC5682Z and CDCM7005 Register Configuration boxes TSW3100 Config Input Displays DA...

Page 14: ...the DLL is bypassed and the LVDS data source is responsible for providing correct setup and hold timing DLL Sleep Input Output When set the DLL is put into sleep mode Auto DLL Input When set the DLL is restarted automatically when there is a change in the DLL settings so there is no need to press the DLL restart control DLL Lock Output Turns green when the internal DLL is locked DLL restart Input ...

Page 15: ... B Input Output Offset adjustment value for the B data path DAC A LPF Input Output Enables a 95 kHz low pass filter corner on the DACA current source bias When disabled a 472 Hz filter corner is used DAC B LPF Input Output Enables a 95 kHz low pass filter corner on the DACB current source bias When disabled a 472 Hz filter corner is used ERROR SETTINGS SLFST Error Input Output Masks out SLFTST Err...

Page 16: ...ference and VCXO frequencies and M and N values If this frequency differs from the VCXO frequency it is displayed in red OUTPUT SETTINGS Y0 Y4 Dividers Input Selects the output dividers of the CDCM7005 outputs Y0 Y4 Levels Input Selects between CMOS or LVPECL levels of the CDCM7005 outputs Y0 Y4 States Input Selects the operating state of the CDCM7005 outputs ADVANCED SETTINGS Advanced Registers I...

Page 17: ... down of THS3091 and THS3095 Vamp Pin 1 2 JP12 CDC_PD Low active power down of CDCM7005 3 3 VCLK Pin 1 2 JP13 VCXOB Choose internal VCXO or external VCXO INB Internal VCXO Pin 1 2 JP14 VCXO_P Choose internal VCXO or external VCXO positive input Internal VCXO Pin 1 2 JP15 VCXO_N Choose CDCM7005 or external VBB CDCM7005 Pin 1 2 JP16 REF_CLK Choose internal 10 MHz ref or external ref Internal Ref Pin...

Page 18: ...p The test setup for the TSW3070EVM is shown in Figure 6 This setup shows the TSW3100 pattern generator supplying an LVDS signal to the TSW3070EVM see the TSW3100 product folder http www ti com tool tsw3100evm Figure 6 TSW3070EVM Driven by TSW3100 Pattern Generator 7 2 Test Equipment The following test equipment is required for testing the TSW3070EVM Some other equipment may be used however result...

Page 19: ...ifferential in to single ended out configuration The gain of the OPA695 has been set to 2 2x and the THS3091 and THS3095 have been set to a gain of 3 3x The input on the OPA695 has an effective 25 Ω load on a 20 mA ac signal The inputs of the THS3091 and THS3095 have an effective 50 Ω load with a 20 mA ac signal Using the TSW3100 in the Multi Tone GUI mode a single tone can be generated and measur...

Page 20: ...ruments Incorporated TSW3070EVM Amplifier Interface to Current Sink DAC Arbitrary Waveform Generator Demonstration A low pass filter LPF is between the DAC outputs and the OPA695 THS3091 and THS3095 This prevents any higher frequency DAC images from affecting performance of the amplifiers The wide bandwidth OPA695 is typically operated at lower gains with smaller output swings with a wider input L...

Page 21: ...0 1 Marker 1 T1 2 28 dBm 11 093589744 MHz 2 Delta 2 T1 0 02 dB 2 003205128 MHz 3 Delta 3 T1 80 00 dB 2 003205128 MHz 4 Delta 4 T1 79 19 dB 4 006410256 MHz www ti com Demonstration Kit Test Configuration Test Equipment 7 1 Test 21 SLWU055A May 2008 Revised May 2016 Submit Documentation Feedback Copyright 2008 2016 Texas Instruments Incorporated TSW3070EVM Amplifier Interface to Current Sink DAC Arb...

Page 22: ... Test Configuration Test Equipment 7 1 Test www ti com 22 SLWU055A May 2008 Revised May 2016 Submit Documentation Feedback Copyright 2008 2016 Texas Instruments Incorporated TSW3070EVM Amplifier Interface to Current Sink DAC Arbitrary Waveform Generator Demonstration Figure 13 Summary of IMD3 for Passive Transformer OPA695 THS3091 and THS3095 Output Figure 14 Summary of Harmonic Distortion for Pas...

Page 23: ... and if it is capable of reading the serial number from the EVM This determines if the communication between the board and the PC is correct The HOME menu of the DAC GUI software indicates this status The VCXO and Reference LEDs D1 D2 must be lit as well as the power LED D18 8 4 Program the CDCM7005 On the DAC5682z EVM GUI click on Register Config which is located on the left side of the GUI Progr...

Page 24: ... file for loading the DAC5682z called DLL_4X_Interp reg5682 can be found on the provided CD To load this file click on the Load Regs button on the right center side of the GUI Navigate to the correct location select this file then click on OK The registers will be loaded and the GUI should now look as shown in Figure 16 If the DLL Lock light is red make sure the pattern generator is providing a pr...

Page 25: ... default set up to output signals through the OPA695 THS3091 and THS3095 These devices can be individually bypassed to a transformer output if needed To bypass the OPA695 move R6 to R109 and R15 to R134 To bypass the THS3091 and THS3095 move R20 to R135 and R27 to R136 Figure 17 DAC5682Z Resistor Jumper Configuration The blue denotes the default configuration operational amplifier output whereas t...

Page 26: ...n the situation merits remove the ferrite beads that connect the OPA695 to the VAMP supplies FB10 FB11 To connect external supplies the VAMP amplifier net must be disconnected from the onboard 5V net This involves removing ferrite beads FB7 and FB13 The external supply can then be connected to TP3 and TP9 Keep in mind that the maximum supply voltages for the OPA695 6 5 V and the THS3095 33 V betwe...

Page 27: ... only be modified by bearing in mind the design of the DAC termination and operational amplifier configuration Both outputs of the amplifiers are intended to drive 50 Ω test equipment 10 Schematic Bill of Materials and Printed Circuit Board Layout The TSW3070EVM schematic bill of materials and board CAD design files can be found on the provided compact disc 10 1 Design Resources TSW3070EVM Product...

Page 28: ...ring the warranty period to the address designated by TI and that are determined by TI not to conform to such warranty If TI elects to repair or replace such EVM TI shall have a reasonable time to repair such EVM or provide replacements Repaired EVMs shall be warranted for the remainder of the original warranty period Replaced EVMs shall be warranted for a new full ninety 90 day warranty period 3 ...

Page 29: ... by Industry Canada to operate with 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 greater than the maximum gain indicated for that type are strictly prohibited for use with this device Concernant les EVMs avec antennes détachables Conformément à la rég...

Page 30: ... 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 inputs and outputs kept within the specified allowable ranges some circuit components may have elevated case temperatures These components include but are not limited to linear regulators switching transistors pass transistors cu...

Page 31: ...F 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 USE LOSS OF DATA OR BUSINESS INTERRUPTION NO CLAIM SUIT OR ACTION SHALL BE BROUGHT AGAINST TI MORE THAN ONE YEAR AFTER THE RELATED CAUSE OF ACTION HAS OCCURRED 8 2 Specific Limitations IN NO EVENT SHALL T...

Page 32: ...esponsible for compliance with all legal regulatory and safety related requirements concerning its products and any use of TI components in its applications notwithstanding any applications related information or support that may be provided by TI Buyer represents and agrees that it has all the necessary expertise to create and implement safeguards which anticipate dangerous consequences of failur...

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