Texas-instruments DAC7741EVM Uživatelský manuál Strana 1

DAC7741EVMOctober 2002 DAP EVMsUser’s GuideSLAU093

Features1-21.1 FeaturesThis EVM features the DAC7741 digital-to-analog converter. The DAC7741EVM is a simple evaluation module designed for a quick an

EVM Basic Functions1-3EVM OverviewThe REF102 precision reference derives its power of ±15-V supply throughJ10 or J7 terminal. The (plus) 15 V connects

EVM Basic Functions1-4A block diagram of the EVM is shown below in the Figure 1-1.Figure 1-1. EVM Block DiagramDAC Out(J4)(J5)W13OutputBufferModuleW1

2-1Physical Description Physical DescriptionThis chapter describes the physical characteristics and PCB layout of the EVMand lists the components used

PCB Layout2-22.1 PCB LayoutThe EVM is constructed on a four-layer printed-circuit board using acopper-clad FR-4 laminate material. The printed-circuit

PCB Layout2-3Physical DescriptionFigure 2-2. Layer Two (Ground Plane)

PCB Layout2-4Figure 2-3. Layer 3 (Power Plane)

PCB Layout2-5Physical DescriptionFigure 2-4. Layer 4 (Bottom Plane)

PCB Layout2-6Figure 2-5. Drill Drawing

Bill of Materials2-7Physical Description2.2 Bill of MaterialsTable 2-1.Parts ListItem # Qty Designator Manufacturer Part Number Description1 1 C8 Pana

IMPORTANT NOTICETexas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications,enhancements, improvemen

Bill of Materials2-8(This page has been left blank intentionally.)

3-1EVM Operation EVM OperationThis chapter covers in detail the operation of the EVM to provide guidance tothe user in evaluating the onboard DAC and

Factory Default Setting3-23.1 Factory Default SettingThe EVM board is set to its default configuration from factory as described onthe table below to

Host Processor Operation3-3EVM Operation3.2 Host Processor OperationThe host processor basically drives the DAC, so the DACs proper operationdepends o

Host Processor Operation3-43.2.2 Output Gain of TwoThis configuration allows the DAC output with a gain of two, but is limited tothe effective rails o

Jumper Setting3-5EVM Operation3.3 Jumper SettingThe figures in Table 3-5 will show the function of each jumper on theEVM.Table 3-5.Jumper Setting Fun

Jumper Setting3-6Table 3-5. Jumper Setting Function (Continued)ReferenceJumperSettingFunctionDisconnects AGND from DGND.W11Connects AGND and DGND tog

Schematic3-7EVM Operation3.4 SchematicA schematic of the DAC7741 is found on the following page.

1 2 3 4 56ABCD654321DCBAti12500 TI Boulevard. Dallas, Texas 75243Title:SHEET: OF:FILE: SIZE:DATE:REV:27-Sep-2002Drawn By:Engineer:Revision HistoryREV

EVM IMPORTANT NOTICETexas Instruments (TI) provides the enclosed product(s) under the following conditions:This evaluation kit being sold by TI is int

EVM WARNINGS AND RESTRICTIONSIt is important to operate this EVM within the input voltage range of ±15 V and the outputvoltage range of ±10 V.Exceedin

Information About Cautions and Warningsiii PrefaceRead This FirstAbout This ManualThis user’s guide describes the characteristics, operation, and the

TrademarksivRelated Documentation From Texas InstrumentsTo obtain a copy of any of the following TI documents, call the Texas Instru-ments Literature

Contentsv Contents1 EVM Overview 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

ContentsviTables2-1 Parts List 2-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-1EVM Overview EVM OverviewThis chapter gives a general overview of the DAC7741 evaluation module(EVM), and describes some of the factors that must b