Texas Instruments DAC7741EVM Manuale utente

User's GuideSLAU093A – October 2002 – Revised May 2005

DAC7741EVM

This user’s guide describes the DAC7741 evaluation module. It covers the operatingprocedures and characteristics of the EVM board along with the device that it supports.The physical PCB layout, schematic diagram, and circuit descriptions are included.

Contents1 Information About Cautions and Warnings ...................................................... 22 Related Documentation from Texas Instruments ............................................... 23 Questions about this or other Data Converter EVM's? ........................................ 24 FCC Warnings ...................................................................................... 2Trademarks .......................................................................................... 25 EVM Overview ...................................................................................... 36 EVM Basic Functions .............................................................................. 47 Physical Description ................................................................................ 58 Bill Of Materials .................................................................................... 129 EVM Operation .................................................................................... 13

List of Figures

1 EVM Block Diagram ................................................................................ 42 Top Silkscreen ...................................................................................... 53 Layer One (Top Signal Plane) .................................................................... 64 Layer Two (Split Ground Plane) .................................................................. 75 Layer Three (Split Power Plane) ................................................................. 86 Layer Four (Bottom Signal Plane) ................................................................ 97 Bottom Silkscreen ................................................................................. 108 Drill Drawing ....................................................................................... 11

List of Tables

1 Parts List ........................................................................................... 122 Factory Default Jumper Settings ................................................................ 133 Unity Gain Output Jumper Settings ............................................................. 144 Gain of Two Output Jumper Settings ........................................................... 155 Capacitive Load Drive Output Jumper Settings ............................................... 156 Jumper Setting Function ......................................................................... 16

DAC7741EVMSLAU093A – October 2002 – Revised May 2005 1

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1 Information About Cautions and Warnings

2 Related Documentation from Texas Instruments

3 Questions about this or other Data Converter EVM's?

4 FCC Warnings

Trademarks

Information About Cautions and Warnings

This manual may contain cautions and warnings.

CAUTIONThis is an example of a CAUTION statement.

A CAUTION statement describes a situation that could potentially damage thisEVM board, your software, or equipment.

WARNINGThis is an example of a WARNING statement.

A WARNING statement describes a situation that could potentially cause HARMto you.

The information in a caution or a warning is provided for your protection. Read each caution and warningcarefully.

To obtain a copy of any of the following TI documents, call the Texas Instruments Literature ResponseCenter at (800) 477-8924 or the Product Information Center (PIC) at (972) 644-5580. When ordering,identify this manual by its title and literature number. Updated documents can also be obtained throughthe TI Web site at http://www.ti.com.

Data Sheets: Literature Number: Data Sheets: Literature Number:DAC7741 SBAS248 SN74AHC541 SCLS261REF102 SBVS022 SN74AHC138 SCLS258OPA627 SBOS165 SN74AHC1G04 SCLS318OPA2277 SBOS079 SN74AHC1G08 SCLS314SN74ALVC16245 SCAS419 SN74AUP1G57 SCES503

If you have questions about this or other Texas Instruments Data Converter evaluation modules, contactthe Data Converter Application Team by e-mail at [email protected]. Include the product you havequestions or concerns with in the subject heading .

This equipment is intended for use in a laboratory test environment only. It generates, uses, and canradiate radio frequency energy and has not been tested for compliance with the limits of computingdevices pursuant to subpart J of part 15 of FCC rules. Operation of this equipment in other environmentsmay cause interference with radio communications, in which case the user at his expense will be requiredto take whatever measures may be required to correct this interference.

TMS320 is a trademark of Texas Instruments.

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5 EVM Overview

5.1 Features

5.2 Power Requirements

EVM Overview

This section gives a general overview of the DAC7741 evaluation module (EVM), and describes some ofthe factors that must be considered in using this module.

This EVM features the DAC7741 digital-to-analog converter. The DAC7741 EVM is a simple evaluationmodule designed for a quick and easy way to evaluate the functionality of the high resolution,single-channel, and parallel input DAC. This EVM features a parallel interface to communicate to any hostprocessor base system

The following sections describe the power requirements of this EVM.

5.2.1 Supply Voltage

The dc power supply requirement for the digital section of this EVM is typically 5 V connected to the J12-3or via J6-10 terminal (when plugged in with another EVM board or interface card) and is referenced toground through the J12-2 and J6-5 terminal. The dc power supply requirement for the analog section (V

CCand V

) of this EVM range from 15.75 V to -15.75 V maximum and connects through J11-3 and J11-1 orthrough J6-1 and J6-2 terminals and is referenced to analog ground through J11-2, J12-2, and J6-6terminals.

The dc source of ±15 V supply required to provide the rails for the external output operational amplifier isderived from V

and V

as described above. The output operational amplifier, U2, is used for outputsignal conditioning or boost capacitive load drive and for other output modes of application.

CAUTIONTo avoid potential damage to the EVM board, make sure that the correctcables are connected to their respective terminals as labeled on the EVMboard. Stresses above the maximum listed voltage ratings may causepermanent damage to the device.

5.2.2 Reference Voltage

Although the DAC7741 has a built-in 10-V voltage reference, an external reference circuit is provided inthe EVM board. The external reference circuit can be isolated if the internal reference voltage is selected.

The 10-V precision voltage reference is provided to supply the external voltage reference for the DACthrough REF102, U3, via jumper W4 by shorting pins 1 and 2. An adjustable 100-k Ωpotentiometer, R11,is installed in series with 20-k Ω, R10, to allow the user to adjust the reference voltage to its desiredsettings. TP1 and TP2 are also provided, as well as J2-20 or J4-20 terminals via jumper W31, to allow theuser to connect another external reference source if the onboard reference circuit is not desired. Theexternal voltage reference should not exceed 10-V dc.

The REF102 precision reference derives its supply power of 15 V through J11 or J6 terminal as describedearlier regarding supply voltages.

The DAC7741 has a REFEN pin to enable the internal reference circuit or disable it and select an externalreference source. The REFEN pin can be hardware-driven through W2 jumper. Likewise, it can also besoftware-driven through J3-17 terminal via W2 jumper by shorting pins 1 and 2. The REF

OUT

pin of theDAC7741 must be connected to the REF

pin to use the internal voltage reference. This is done throughthe W3 jumper by shorting pins 1 and 2. Shorting pins 2 and 3 of W3 selects the external voltagereference source.

DAC7741EVMSLAU093A – October 2002 – Revised May 2005 3

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6 EVM Basic Functions

DAC Out

(J2)

(J4)

(J3)

+ 15 V

- 15 V

GND

(J1)

(J6)

(J11)

(J12)

W13

W14

TP1

VCC VCC

VDD VDD

VSS VSS

LDAC

RSTSEL

DB15 (MSB)

DB1 (MSB)

A2...A0

R/W

RST

+ 3.3 V

REFEN

TP2

+REF

Ext Ref

Input

External

Reference

Module

DAC Module

3.3 V

Logic and

Translators

REFIN REFOUT

Output

Buffer

Module

+ 15 V

- 15 V

EVM Basic Functions

The on-chip reference buffer output is funneled out through V

REF

pin, which is used to set up theDAC7741 output amplifier into one of three voltage output modes. V

REF

can also be used to drive othersystem components that require external voltage reference. See the data sheet for more informationregarding the internal reference feature.

CAUTIONWhen applying an external voltage reference through TP1, J2-20, or J4-20,make sure that it does not exceed 14.35 V maximum. Otherwise, this canpermanently damage the DAC7741, U1, device under test.

The DAC7741 EVM is a functional evaluation platform to test certain functional characteristics of theDAC7741 digital-to-analog converter. Functional evaluation of the DAC device can be accomplished withthe use of any microprocessor, TMS320™ DSP family, or some sort of a signal/waveform generator.

The headers, J1 and J3, are provided to connect the necessary control signals and data needed tointerface a microprocessor/microcontroller, TI’s DSP Starter Kit, or waveform generator to the DAC7741EVM. A custom cable can be built for this purpose if using the EVM without the use of TI’s 5-6k interfaceadapter board or the HPA449 platform.

The 5-6k interface adapter board is used for most of TI’s DSP Starter Kits (DSK). Hence, if using theTMS320C5x™ DSP generation and TMS320C6x™ DSP generation DSKs, the 5-6k interface adapterboard proves practical, as no cabling is required. In addition, the HPA449 platform is also available for useif the MSP430 microcontroller is desired as the host processor. Call or e-mail TI for more informationregarding the adapter interface board.

The output of the DAC can be monitored through one of two terminals J2 or J4. Shorting pins 1 and 2 ofjumper W30, allows the DAC output to be seen on J4 pins 2, 4, 6, and 8. The 6-pin header, W13, providesdifferent options of the DAC output, but requires the output operational amplifier, U2, to first be configuredcorrectly for the desired waveform characteristic. Shorting pins 1 and 2 of W13 allows the user to monitorthe raw output of the DAC7741.

A block diagram of the EVM is shown below in the Figure 1 .

Figure 1. EVM Block Diagram

DAC7741EVM 4 SLAU093A – October 2002 – Revised May 2005

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7 Physical Description

7.1 PCB Layout

+15V-15V

Physical Description

This section describes the physical characteristics and PCB layout of the EVM and lists the componentsused on the module.

The EVM is constructed on a four-layer printed-circuit board using a copper-clad FR-4 laminate material.The printed-circuit board has a dimension of 96,52 mm (3.80 inch) X 102,87 mm (4.050 inch), and theboard thickness is 1,57 mm (0.062 inch). Figure 2 through Figure 6 show the individual artwork layers.

Figure 2. Top Silkscreen

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Physical Description

Figure 3. Layer One (Top Signal Plane)

DAC7741EVM 6 SLAU093A – October 2002 – Revised May 2005

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Physical Description

Figure 4. Layer Two (Split Ground Plane)

DAC7741EVMSLAU093A – October 2002 – Revised May 2005 7

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Physical Description

Figure 5. Layer Three (Split Power Plane)

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Physical Description

Figure 6. Layer Four (Bottom Signal Plane)

DAC7741EVMSLAU093A – October 2002 – Revised May 2005 9

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Physical Description

Figure 7. Bottom Silkscreen

DAC7741EVM 10 SLAU093A – October 2002 – Revised May 2005

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