Texas Instruments DAC8881 Скачать руководство пользователя страница 23

Evaluation Board/Kit Important Notice

Texas Instruments (TI) provides the enclosed product(s) under the following conditions:

This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION
PURPOSES ONLY 
and is not considered by TI to be a finished end-product fit for general consumer use. Persons handling the
product(s) must have electronics training and observe good engineering practice standards. As such, the goods being provided are
not intended to be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations,
including product safety and environmental measures typically found in end products that incorporate such semiconductor
components or circuit boards. This evaluation board/kit does not fall within the scope of the European Union directives regarding
electromagnetic compatibility, restricted substances (RoHS), recycling (WEEE), FCC, CE or UL, and therefore may not meet the
technical requirements of these directives or other related directives.

Should this evaluation board/kit not meet the specifications indicated in the User’s Guide, the board/kit may be returned within 30
days from the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY
SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING
ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE.

The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user indemnifies TI from all
claims arising from the handling or use of the goods. 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 ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.

TI currently deals with a variety of customers for products, and therefore our arrangement with the user is not exclusive.

TI assumes no liability for applications assistance, customer product design, software performance, or infringement of
patents or services described herein.

Please read the User’s Guide and, specifically, the Warnings and Restrictions notice in the User’s Guide prior to handling the
product. This notice contains important safety information about temperatures and voltages. For additional information on TI’s
environmental and/or safety programs, please contact the TI application engineer or visit

www.ti.com/esh

.

No license is granted under any patent right or other intellectual property right of TI covering or relating to any machine, process, or
combination in which such TI products or services might be or are used.

FCC Warning

This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION
PURPOSES ONLY 
and is not considered by TI to be a finished end-product fit for general consumer use. It generates, uses, and
can radiate radio frequency energy and has not been tested for compliance with the limits of computing devices pursuant to part 15
of FCC rules, which are designed to provide reasonable protection against radio frequency interference. Operation of this
equipment in other environments may cause interference with radio communications, in which case the user at his own expense
will be required to take whatever measures may be required to correct this interference.

EVM Warnings and Restrictions

It is important to operate this EVM within the input voltage range of 2.7 V to 5 V and the output voltage range of -5 V to +5 V .

Exceeding the specified input range may cause unexpected operation and/or irreversible damage to the EVM. If there are
questions concerning the input range, please contact a TI field representative prior to connecting the input power.

Applying loads outside of the specified output range may result in unintended operation and/or possible permanent damage to the
EVM. Please consult the EVM User's 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, some circuit components may have case temperatures greater than 30°C. The EVM is designed to
operate properly with certain components above 85°C as long as the input and output ranges are maintained. These components
include but are not limited to linear regulators, switching transistors, pass transistors, and current sense resistors. These types of
devices can be identified using the EVM schematic located in the EVM User's Guide. When placing measurement probes near
these devices during operation, please be aware that these devices may be very warm to the touch.

Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265

Copyright © 2009, Texas Instruments Incorporated

Содержание DAC8881

Страница 1: ...Jumper Settings 14 3 6 Schematics 16 4 Using the DAC8881EVM with DXP 16 4 1 Hardware 17 4 2 MMB0 Power Supplies 17 4 3 Software Running DXP 18 4 4 DAC Output Update Options 20 4 5 Data Input Format 2...

Страница 2: ...rint of U3 is compatible with many SO 8 package type reference devices so the user has the flexibility to select the reference supply to set the output range of the DAC8881 other than what is provided...

Страница 3: ...ected Shorting pins 2 and 3 of both jumpers selects the reference voltages that are applied via J4 pins 18 and 20 respectively These voltages normally come from the host platform that is interfaced wi...

Страница 4: ...should include adequate bypassing identifying and managing analog and digital signals and knowing or understanding the mechanical attributes of the components The critical part of the design is the la...

Страница 5: ...s dimensions of 43 1800 mm 1 7000 inch 82 5500 mm 3 2500 inch and the board thickness is 1 5748 mm 0 062 inch Figure 2 through Figure 8 show the individual artwork layers Figure 2 Top Silkscreen Figur...

Страница 6: ...www ti com Figure 4 Layer 2 Ground Plane Figure 5 Layer 3 Power Plane 6 DAC8881 Evaluation Module SLAU257A September 2008 Revised November 2009 Submit Documentation Feedback Copyright 2008 2009 Texas...

Страница 7: ...rformance Figure 6 Layer 4 Bottom Signal Plane Figure 7 Bottom Silkscreen 7 SLAU257A September 2008 Revised November 2009 DAC8881 Evaluation Module Submit Documentation Feedback Copyright 2008 2009 Te...

Страница 8: ...ware 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 measureme...

Страница 9: ...6 10 F 1210 ceramic cap X7R 16V TDK C3225B63X7R1C106Z 4 7 C1 C2 C3 C4 C7 C15 C17 0 1 F 0805 ceramic cap X7R 50V 10 TDK C2012X7R1H104K 5 2 C9 C10 1 F 0805 ceramic cap X7R 16V 10 TDK C3216X7R1C105K 6 2...

Страница 10: ...MMH 102 01 T T 28 10 Shunt 2mm shunt black Samtec 2SN BK G 29 0 R5 R7 R25 2 DNP 30 1 Shunt 0 100 shunt black Samtec SNT 100 BK T 1 P2 P4 and P6 parts are not shown in the schematic diagram All P desig...

Страница 11: ...is connected to the noninverting input of the op amp U2 Figure 10 DAC8881 EVM Default Jumper Configuration 3 2 Host Processor Interface The host processor basically drives the DAC so the DACs proper...

Страница 12: ...nd the signal used depends on the host controller that is selected to communicate with the DAC8881EVM Either signal can be chosen to drive the DAC8881 chip select CS pin The basic function of the CS a...

Страница 13: ...the connector J4 The selected pins of the J4 connector as dictated by the jumper positions of the W2 and W7 jumpers can then be connected to the load to close the loop The EVM includes an external op...

Страница 14: ...e loads Increasing the gain enhances the ability of the amplifier to drive even more capacitance and by adding a load resistor even improves the capacitive load drive capability Table 6 shows the jump...

Страница 15: ...is is the default mode of the EVM from the factory Routes the reference feedback RFB pin of the DAC8881 to J4 pin 8 to provide the option to close the output op amp U2 loop as close as possible to the...

Страница 16: ...wn status If jumper is installed on pins 13 and 14 the SDOSEL pin of the DAC8881 is tied to ground so that the DAC device can be operated in daisy chain mode DAC8881 IOVDD is powered with 5VD J3 DAC88...

Страница 17: ...3 100 W12 W3 R1 0 CS VOUT1 VOUT2 TP5 IOVDD RFB RFB1 RFB2 W2 W7 Do not populate R5 R7 R25 W8 3 2 6 7 4 8 U5 OPA277 1 First Proto Release JLP J PARGUIAN 6489897 1 AVDD 5 VREFH 11 RFB 9 VOUT 8 CS 19 SCLK...

Страница 18: ...O NOT connect the MMB0 to your PC before installing the DXP software as described in the DXP User s Guide Installing the software will ensure the necessary drivers are properly loaded to run the hardw...

Страница 19: ...MMB0 Connect all other analog supplies as necessary to J14 on the MMB0 4 3 Software Running DXP Install DXP on a laptop or personal computer running Windows XP as per the detailed instruction in the...

Страница 20: ...lease ensure no jumpers are placed on J1 pins 9 10 When the RST pin is low the device is in hardware reset mode and the input register and DAC latch are set to the value defined by the RSTSEL pin refe...

Страница 21: ...1 2 routes the LDAC input to pin 15 of J2 This feature allows the user to Timer apply an LDAC input from an external source In this mode J2 pin 15 provides an interrupt to the DSP on the MMB0 which tr...

Страница 22: ...terature Number DAC8881 SBAS422 REF02 SBVS003 REF5050 SBOS410 REF5045 SBOS410 OPA211 SBVS058 OPA627 SBOS165 OPA277 SBOS079 OPA2277 SBOS079 OPA227 SBOS110 5 2 Questions About This or Other Data Convert...

Страница 23: ...oduct This notice contains important safety information about temperatures and voltages For additional information on TI s environmental and or safety programs please contact the TI application engine...

Страница 24: ...ce TI is not responsible or liable for any such statements TI products are not authorized for use in safety critical applications such as life support where a failure of the TI product would reasonabl...

Страница 25: ...Mouser Electronics Authorized Distributor Click to View Pricing Inventory Delivery Lifecycle Information Texas Instruments DAC8881EVM...

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