Texas Instruments DAC9881 User Manual
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Texas Instruments DAC9881 User Manual

Evaluation module
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This user's guide describes the characteristics, operation, and the use of the DAC9881 Evaluation Module
(EVM). It covers all pertinent areas involved to properly use this EVM board along with the devices that it
supports. The physical PCB layout, schematic diagram, and circuit descriptions are included.
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SLAU279A - March 2009 - Revised November 2009
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Copyright © 2009, Texas Instruments Incorporated
SLAU279A - March 2009 - Revised November 2009
DAC9881 Evaluation Module
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User's Guide
DAC9881 Evaluation Module
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  • Page 1: Table Of Contents

    SLAU279A – March 2009 – Revised November 2009 DAC9881 Evaluation Module This user’s guide describes the characteristics, operation, and the use of the DAC9881 Evaluation Module (EVM). It covers all pertinent areas involved to properly use this EVM board along with the devices that it supports.

  • Page 2: Evm Overview

    50 MHz to communicate with any host microprocessor or DSP-based system. The DAC9881 is designed to work by default for unipolar output range, but it can also be configured for bipolar output range with the addition of an external amplifier and some resistors. The option for bipolar mode of operation is included in the EVM with some minor jumper configuration.

  • Page 3: Evm Basic Functions

    V H pin sets the positive range of the DAC9881 output. Also, applying the desired voltage between the range of -0.2 V to +0.2 V into the V L pin sets the negative range of the DAC9881 output, although the V L pin must nominally be set to zero volts.

  • Page 4: Pcb Design And Performance

    The PCB has a dimension of 43,18 mm (1.70 inch) × 82,55 mm (3.25 inch), and the board thickness is 1,57 mm (0.062 inch). Figure 2 through Figure 7 show the individual artwork layers. DAC9881 Evaluation Module SLAU279A – March 2009 – Revised November 2009 Submit Documentation Feedback Copyright © 2009, Texas Instruments Incorporated...

  • Page 5: Top Silkscreen

    PCB Design and Performance www.ti.com Figure 2. Top Silkscreen Figure 3. Layer 1, Top Signal Plane SLAU279A – March 2009 – Revised November 2009 DAC9881 Evaluation Module Submit Documentation Feedback Copyright © 2009, Texas Instruments Incorporated...

  • Page 6: Layer 1, Top Signal Plane

    PCB Design and Performance www.ti.com Figure 4. Layer 2, Ground Plane Figure 5. Layer 3, Power Plane DAC9881 Evaluation Module SLAU279A – March 2009 – Revised November 2009 Submit Documentation Feedback Copyright © 2009, Texas Instruments Incorporated...

  • Page 7: Evm Performance

    Figure 7. Bottom Silkscreen EVM Performance The DAC9881 is optimized for DC performance; total harmonic distortion (THD) is typically at -80 dB. The EVM INL and DNL testing is performed using a high-density DAC bench test board, an Agilent 3458A digital multimeter, and a personal computer (PC) running LabVIEW™...

  • Page 8: Inl And Dnl Characteristic Plot

    EVM Performance www.ti.com Figure 8. INL and DNL Characteristic Plot DAC9881 Evaluation Module SLAU279A – March 2009 – Revised November 2009 Submit Documentation Feedback Copyright © 2009, Texas Instruments Incorporated...

  • Page 9: Bill Of Materials

    PC Board opposite the J designated counterpart. Example, J2 is installed on the topside while P2 is installed in the bottom side opposite of J2. SLAU279A – March 2009 – Revised November 2009 DAC9881 Evaluation Module Submit Documentation Feedback Copyright © 2009, Texas Instruments Incorporated...

  • Page 10: Evm Operation

    J4-2 and J4-4 (if they are shunted) to the noninverting input of U2 operational amplifier. OPEN The LDAC signal of the DAC9881 is tied to ground for synchronous update of the DAC9881 output. Routes V to power the analog supply of the U3 reference device.

  • Page 11: Host Processor Interface

    CS Signal The signals found on J2 pins 1 and 7 of the EVM are used to control the chip select input of the DAC9881. These signals are configurable via wire jumper W6. Either signal can be chosen to drive the DAC9881 CS pin.

  • Page 12: Analog Output

    (MSB) of the DAC data and the 24th bit is the least significant bit (LSB) of the 18-bit DAC data. The serial data input is driven from the SPI master on the falling SCLK edge and sampled by the DAC9881 on the rising edge of the serial clock.
  • Page 13 , to the negative rail of operational amplifier, U2, for wider range of operation. CLOSE Connect the negative input of the operational amplifier, U2, to the gain resistor, R12. SLAU279A – March 2009 – Revised November 2009 DAC9881 Evaluation Module Submit Documentation Feedback Copyright © 2009, Texas Instruments Incorporated...

  • Page 14: Jumper Setting

    Negative supply rail of the output operational amplifier, U2, is tied to AGND for unipolar operation. CS signal from J2-1 is routed to drive the CS signal of the DAC9881. FS signal from J2-7 is routed to drive the CS signal of the DAC9881.
  • Page 15 DAC’s input data format is set for 2s complement format. If jumper is installed on pins 9 and 10, the RST pin of the DAC9881 is tied to ground so that the DAC is forced into hardware reset mode.

  • Page 16: Dac9881Evm Schematic

    The DAC9881EVM schematic appears as the last page of this manual. Using the DAC9881EVM with DXP The DAC9881EVM is compatible with the DAC eXerciser Program (DXP) from Texas Instruments. DXP is a tool that can generate the necessary code required to output various signals and waveforms from the DAC9881EVM.

  • Page 17: Mmb0 Power Supplies

    J13 are completely removed. Permanent damage to the MMB0 may occur otherwise. From left to right, the screw terminal connections of J14 are –VA, +VA, +5VA, –5VA, +5VD, and GND. The DAC9881 board has power requirements as described in Section 1.2. The analog power for Vcc (+VA), Vss (-VA), and +5VA may be applied directly to the screw terminals at J14 on the MMB0 (referenced to the GND terminal).

  • Page 18: Software - Running Dxp

    12 on the right side of the screen labeled GPIO-controlled DAC Functions. Pressing the Reset button resets the DAC9881 outputs as described in the device data sheet. Pressing the Power-Down button places the DAC9881 in low-power mode. DAC9881 Evaluation Module SLAU279A –...

  • Page 19: Related Documentation From Texas Instruments

    7. OPA227, High Precision, Low Noise Operational Amplifiers data sheet (SBOS110) If you have questions about this or other Texas Instruments Data Converter evaluation modules, send an e-mail to the Data Converter Application Team at dataconvapps@list.ti.com. Include in the subject heading the product with which you have questions or concerns.
  • Page 20 12500 TI Boulevard. Dallas, Texas 75243 IOVDD = +1.7V to AVDD VSS = 0V to -15V Analog Title: DAC9881 EVM Engineer: J. PARGUIAN DOCUMENTCONTROL # 0.1% 6498233 REV: Drawn By: J. PARGUIAN FILE: DATE: 9-Mar-2009 SIZE: SHEET: DAC9881 Rev A.Sch...
  • Page 21 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.
  • Page 22 IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.
  • Page 23 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Texas Instruments DAC9881EVM DAC9881EVM-PDK...

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