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Texas Instruments DAC8574 Скачать руководство пользователя страница 9

1-1

EVM Overview

EVM Overview

This chapter gives a general overview of the DAC8574 evaluation module
(EVM), and describes some of the factors that must be considered in using this
module.

Topic

Page

1.1

Features

1-2

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

1.2

Power Requirements

1-2

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

1.3

EVM Basic Functions

1-3

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

Chapter 1

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Содержание DAC8574

Страница 1: ...DAC8574 Evaluation Module June 2003 Data Acquisition Digital Analog Converters User s Guide SLAU109 ...

Страница 2: ...titute a license from TI to use such products or services or a warranty or endorsement thereof Use of such information may require a license from a third party under the patents or other intellectual property of the third party or a license from TI under the patents or other intellectual property of TI Reproduction of information in TI data books or data sheets is permissible only if reproduction ...

Страница 3: ... handling or use of the goods Please be aware that the products received may not be regulatory compliant or agency certified FCC UL CE etc Due to the open construction of the product it is the user s responsibility to take any and all appropriate precautions with regard to electrostatic discharge EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR A...

Страница 4: ...here is uncertainty as to the load specification please contact a TI field representative During normal operation some circuit components may have case temperatures greater than 60 C The EVM is designed to operate properly with certain components above 60 C as long as the input and output ranges are maintained These components include but are not limited to linear regulators switching transistors ...

Страница 5: ...nual This document contains the following chapters Chapter 1 EVM Overview Chapter 2 PCB Design and Performance Chapter 3 EVM Operation Information About Cautions and Warnings This book may contain cautions and warnings The information in a caution or a warning is provided for your protection Read each caution and warning carefully This is an example of a caution statement A caution statement descr...

Страница 6: ... mail the Data Converter Application Team at dataconvapps list ti com Inlcude in the subject heading the product you have questions or concerns with FCC Warning This equipment is intended for use in a laboratory test environment only It generates uses and can radiate radio frequency energy and has not been tested for compliance with the limits of computing devices pursuant to subpart J of part 15 ...

Страница 7: ...mance 2 1 2 1 PCB Layout 2 2 2 2 EVM Performance 2 6 2 3 Bill of Materials 2 11 3 EVM Operation 3 1 3 1 Factory Default Setting 3 2 3 2 Host Processor Interface 3 2 3 3 EVM Stacking 3 3 3 4 The Output Op Amp 3 3 3 4 1 Unity Gain Output 3 4 3 4 2 Output Gain of Two 3 4 3 4 3 Capacitive Load Drive 3 4 3 5 Optional Signal Conditioning Op Amp U8B 3 5 3 6 Jumper Setting 3 6 3 7 Schematic 3 7 ...

Страница 8: ... 2 6 2 9 INL and DNL Characterization Graph of DAC A 2 7 2 10 INL and DNL Characterization Graph of DAC B 2 8 2 11 INL and DNL Characterization Graph of DAC C 2 9 2 12 INL and DNL Characterization Graph of DAC D 2 10 Tables 2 1 Parts List 2 11 3 1 Factory Default Jumper Setting 3 2 3 2 DAC Output Channel Mapping 3 3 3 3 Unity Gain Output Jumper Settings 3 4 3 4 Gain of Two Output Jumper Settings 3...

Страница 9: ...apter gives a general overview of the DAC8574 evaluation module EVM and describes some of the factors that must be considered in using this module Topic Page 1 1 Features 1 2 1 2 Power Requirements 1 2 1 3 EVM Basic Functions 1 3 Chapter 1 ...

Страница 10: ...ctively or through J6 1 and J6 2 terminals The 5 VA connects through J5 3 or J6 3 and the 3 3 VA connects through J6 8 All of the analog power supplies are referenced to analog ground through J1 2 and J6 6 terminals The device under test U1 analog power supply can be powered by either 5 VA or 3 3 VA by selecting the proper position of jumper W1 This allows the DAC8574 analog section to operate in ...

Страница 11: ...SP or some sort of a waveform generator The headers J2 and P2 are the connectors provided to allow the control signals and data required to interface a host processor or waveform generator to the DAC8574 EVM using a custom built cable A specific adapter interface card is also available for most of TI s DSP starter kit DSK and the card model depend on the type of the TI DSP starter kit to be used M...

Страница 12: ... 1 EVM Block Diagram DAC Module Output Buffer Module VCC VSS VCC GND GND VDD DAC Out 4 CH J1 J5 J6 P6 External Reference Module VDD J2 P2 A0 A1 LDAC SCL SDA TP2 W4 TP1 VSS W2 W11 W12 W13 J4 P4 8 CH TP3 A2 A0 A2 TP5 W6 W9 W7 W3 W15 W5 VSS VREFH VREFL VREFH 3 3 VA 5 VA A3 A1 W8 A3 W10 ...

Страница 13: ...and mechanical characteristics of the EVM This section also shows the resulting performance of the EVM which can be compared to the device specification listed in the data sheet The list of components used on the module is also included in this section Topic Page 2 1 PCB Layout 2 2 2 2 EVM Performance 2 6 2 3 Bill of Materials 2 11 Chapter 2 ...

Страница 14: ...d plane is very important and must be carefully considered in the layout process A solid plane is ideally preferred but sometimes impractical so when solid planes are not possible a split plane can do the job as well When considering a split plane design analyze the component placement and carefully split the board into its analog and digital sections starting from the device under test The ground...

Страница 15: ...PCB Layout 2 3 PCB Design and Performance Figure 2 1 Top Silkscreen Figure 2 2 Layer 1 Top Signal Plane Figure 2 3 Layer 2 Ground Plane ...

Страница 16: ...PCB Layout 2 4 Figure 2 4 Layer 3 Power Plane Figure 2 5 Layer 4 Bottom Signal Plane Figure 2 6 Bottom Silkscreen ...

Страница 17: ...PCB Layout 2 5 PCB Design and Performance Figure 2 7 Drill Drawing ...

Страница 18: ... The EVM board is tested for all codes of 65535 and the device under test DUT is allowed to settle for 1ms before the meter is read This process is repeated for all codes to generate the measurements for INL and DNL results and is shown in Figure 2 9 The parameters and results of the DAC8574 EVM characterization test can be seen in Figure 2 8 Figure 2 8 DAC8574 EVM Test Parameters and Results ...

Страница 19: ...EVM Performance 2 7 PCB Design and Performance Figure 2 9 INL and DNL Characterization Graph of DAC A ...

Страница 20: ...EVM Performance 2 8 Figure 2 10 INL and DNL Characterization Graph of DAC B ...

Страница 21: ...EVM Performance 2 9 PCB Design and Performance Figure 2 11 INL and DNL Characterization Graph of DAC C ...

Страница 22: ...EVM Performance 2 10 Figure 2 12 INL and DNL Characterization Graph of DAC D ...

Страница 23: ...00 kΩ BOURNS_32X4W Series 5T Pot 13 1 J6 Samtec TSM 105 01 T DV 5X2X0 1 10 pin 3A isolated power socket 14 2 J2 J4 Samtec TSM 110 01 S DV M 10X2X 1 20 pin 0 025 sq SMT socket 15 2 J1 J5 On Shore Technology ED555 3DS 3 Pin terminal connector 16 1 U1 Texas Instruments DAC8574IPW 16 Bit quad voltage output serial input I2C DAC TSSOP 16 17 1 U2 Texas Instruments OPA627AU 8 SOP D precision op amp 18 1 ...

Страница 24: ...2 12 ...

Страница 25: ...er to the DAC8574 data sheet SLAS377A for information about its serial interface and other related topics The EVM board is factory tested and configured to operate in the bipolar output mode Topic Page 3 1 Factory Default Setting 3 2 3 2 Host Processor Interface 3 2 3 3 EVM Stacking 3 3 3 4 The Output Op Amp 3 3 3 5 Optional Signal Conditioning Op Amp U8B 3 5 3 6 Jumper Setting 3 6 3 7 Schematic 3...

Страница 26: ...ain of 2 J4 1 2 DAC output A VOUTA is connected to the noninverting input of the output op amp U2 3 2 Host Processor Interface The host processor basically drives the DAC so the DAC s proper operation depends on the successful configuration between the host processor and the EVM board In addition a properly written code is also required to operate the DAC A custom cable can be made specific to the...

Страница 27: ...ust have its own unique I2C address This is accomplished by configuring the address jumpers W7 through W10 refer to the data sheet for I2C addressing The LDAC signal can be shared to have a synchronous DAC output update and is hardware driven by GPIO0 If controlling the LDAC through software is desired the GPIO0 signal must be set low through software or the J2 pin 2 can be pin strapped to DGND 3 ...

Страница 28: ... the jumpers W3 and W15 These configurations allow the user to choose whether the DAC output has VREFH as an offset or not Table 3 4 shows the proper jumper settings of the EVM for the 2 gain output of the DAC Table 3 4 Gain of Two Output Jumper Settings Jumper Setting Reference Unipolar Bipolar Function Close Close Inverting input of the output op amp U2 is connected to VREFH for use as its offse...

Страница 29: ...1 of W15 jumper and maybe used as the output terminal 3 5 Optional Signal Conditioning Op Amp U8B One part of the dual package op amp OPA2132 U8 is used for reference buffering U8A while the other is unused This unused op amp U8B is left for whatever op amp circuit application the user desires to implement The 1206 footprint for the resistors and capacitors surrounding the U8B op amp are not popul...

Страница 30: ...4 1 3 Negative supply rail of the output op amp U2 is powered by VSS for bipolar operation W5 1 3 Negative supply rail of the output op amp U2 is tied to AGND for unipolar operation 1 3 VREFL is tied to AGND W6 1 3 Routes the user supplied negative reference from TP2 or J4 18 to the VREFL input of the DAC8574 This voltage should be within the range of 0V to VREFH A0 pin is set high through pullup ...

Страница 31: ...Routes VOUTD to J4 8 W13 1 3 Routes VOUTD to J4 16 Disconnects the inverting input of the output op amp U2 from AGND W15 Connects the inverting input of the output op amp U2 to AGND for gain of 2 Legend Indicates the corresponding pins that are shorted or closed 3 7 Schematic The schematic is located on the following page ...

Страница 32: ...DAC SYNC 9 AVDD 4 VoutC 7 U1 DAC7574 8534 8574 VDD R15 440 0 R16 440 0 R5 3K R7 3K R1 10K R2 10K R3 10K R4 10K REFin W2 OUT_A1 OUT_C1 OUT_B1 OUT_D1 OUT_A2 OUT_B2 OUT_C2 OUT_D2 OUT_A OUT_B OUT_C OUT_D 2 3 1 8 4 U8A OPA2227UA 5 6 7 U8B OPA2227UA R17 0 TP5 REFin VrefH R14 10K VrefH VCC C7 0 1µF TP3 VOUT U2_ IN U2_ IN U2_OUT VrefL 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 20 17 19 18 J2 Serial Header W6 ...

Страница 33: ...Mouser Electronics Authorized Distributor Click to View Pricing Inventory Delivery Lifecycle Information Texas Instruments DAC8574EVM ...

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