Texas Instruments DAC7741EVM User Manual
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Texas Instruments DAC7741EVM User Manual

Texas Instruments DAC7741EVM User Manual

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This user's guide describes the DAC7741 evaluation module. It covers the operating
procedures and characteristics of the EVM board along with the device that it supports.
The physical PCB layout, schematic diagram, and circuit descriptions are included.
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SLAU093A - October 2002 - Revised May 2005
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SLAU093A - October 2002 - Revised May 2005
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User's Guide
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Summary of Contents for Texas Instruments DAC7741EVM

  • Page 1: Table Of Contents

    EVM board along with the device that it supports. The physical PCB layout, schematic diagram, and circuit descriptions are included. Contents ............Information About Cautions and Warnings ..........Related Documentation from Texas Instruments ........Questions about this or other Data Converter EVM's? ..................FCC Warnings ..................

  • Page 2: Information About Cautions And Warnings

    Related Documentation from Texas Instruments To obtain a copy of any of the following TI documents, call the Texas Instruments Literature Response Center 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 through the TI Web site at http://www.ti.com.

  • Page 3: Evm Overview

    This is done through the W3 jumper by shorting pins 1 and 2. Shorting pins 2 and 3 of W3 selects the external voltage reference source. SLAU093A – October 2002 – Revised May 2005 DAC7741EVM...

  • Page 4: Evm Basic Functions

    + 3.3 V REFEN LDAC +REF DAC Out Ext Ref RSTSEL Input (J3) A2...A0 (J2) (J4) DAC Module 3.3 V Logic and Translators DB15 (MSB) (J1) DB1 (MSB) Figure 1. EVM Block Diagram DAC7741EVM SLAU093A – October 2002 – Revised May 2005...

  • Page 5: Physical Description

    The printed-circuit board has a dimension of 96,52 mm (3.80 inch) X 102,87 mm (4.050 inch), and the board thickness is 1,57 mm (0.062 inch). Figure 2 through Figure 6 show the individual artwork layers. -15V +15V Figure 2. Top Silkscreen SLAU093A – October 2002 – Revised May 2005 DAC7741EVM...

  • Page 6: Layer One (Top Signal Plane)

    Physical Description Figure 3. Layer One (Top Signal Plane) DAC7741EVM SLAU093A – October 2002 – Revised May 2005...

  • Page 7: Layer Two (Split Ground Plane)

    Physical Description Figure 4. Layer Two (Split Ground Plane) SLAU093A – October 2002 – Revised May 2005 DAC7741EVM...

  • Page 8: Layer Three (Split Power Plane)

    Physical Description Figure 5. Layer Three (Split Power Plane) DAC7741EVM SLAU093A – October 2002 – Revised May 2005...

  • Page 9: Layer Four (Bottom Signal Plane)

    Physical Description Figure 6. Layer Four (Bottom Signal Plane) SLAU093A – October 2002 – Revised May 2005 DAC7741EVM...

  • Page 10: Bottom Silkscreen

    Physical Description Figure 7. Bottom Silkscreen DAC7741EVM SLAU093A – October 2002 – Revised May 2005...

  • Page 11: Drill Drawing

    Physical Description Figure 8. Drill Drawing SLAU093A – October 2002 – Revised May 2005 DAC7741EVM...

  • Page 12: Bill Of Materials

    P1, P2, P3, P4, and P6 parts are not shown in the schematic diagram. All the P-designated parts are installed in the bottom side of the PC board opposite the J-designated counterpart. Example, J1 is installed on the top side while P1 is installed in the bottom side opposite of J1. DAC7741EVM SLAU093A – October 2002 – Revised May 2005...

  • Page 13: Evm Operation

    The DSP_CS pin is not used (C5x™ DSP only). The DC_CSa# is used to control the enable function of U10. is routed to J4 terminal. OPEN External reference source via pin 20 of J2 or J4 is not used. SLAU093A – October 2002 – Revised May 2005 DAC7741EVM...

  • Page 14: Unity Gain Output Jumper Settings

    DAC output is sent to the output terminals. Open Open exREFin is disconnected from the negative input of the operational amplifier. Open Open Disconnect negative input of the operational amplifier from GND DAC7741EVM SLAU093A – October 2002 – Revised May 2005...

  • Page 15: Gain Of Two Output Jumper Settings

    Disconnect exREFin from negative input of the operational amplifier. Open Disconnect R12 If there is a need to incrementally adjust the capacitive load output, replace R12 with a capacitor with the desired capacitance value and close W15. SLAU093A – October 2002 – Revised May 2005 DAC7741EVM...

  • Page 16: Jumper Setting Function

    RFB1 pin is not connected. RFB1 pin is strapped to RFB2 pin for DAC V feedback. Disconnects AGND from DGND. Connects AGND and DGND together. DAC7741EVM SLAU093A – October 2002 – Revised May 2005...
  • Page 17 U5 is disabled. U5 is enabled. U6 is disabled. U6 is enabled. R/W is not routed through to control U6 direction pin, DIR. R/W is routed through to control U6 direction pin, DIR. SLAU093A – October 2002 – Revised May 2005 DAC7741EVM...
  • Page 18 External reference source through J4-20 is routed in. External reference source through J2-20 is routed in. Legend: Indicates the corresponding pins that are shorted or closed. Schematic A schematic of the DAC7741 is found on the following page. DAC7741EVM SLAU093A – October 2002 – Revised May 2005...
  • Page 19 Revision History ECN Number Approved +5VD Original Release Added Logic to accomodate 5-6K card [DB15..DB0] Added option of selecting output terminal and corrected DSP CS & R/nW logic. DSP_R/W 0.1µF CS_B +5VD (HPA449_R/W) DSP_CS R/W_B LDAC (HPA449_CS) LDAC_B RST_B DC_CSa# RSTSEL_B RSTSEL REFen_B...
  • Page 20 Revision History ECN Number Approved Control_Signals [DB15..DB0] 0.1µF 10µF DB15 CS_B DB15 DB14 R/W_B DB14 DB13 LDAC_B DB13 LDAC 0.1µF 10µF DB12 DB12 DB11 RST_B DB11 DB10 RSTSEL_B DB10 RSTSEL REFadj Vref Roffset +5VD 0/5K/20K REFout 100K Sum_Junc REFin 1µF RFB1 0.1µF DAC_VOUT...
  • Page 21 EVM IMPORTANT NOTICE Texas Instruments (TI) provides the enclosed product(s) under the following conditions: This evaluation kit being sold by TI is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not considered by TI to be fit for commercial use. As such, the goods being provided may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including product safety measures typically found in the end product incorporating the goods.
  • Page 22 TI as compliant with ISO/TS 16949 requirements. Buyers acknowledge and agree that, if they use any non-designated products in automotive applications, TI will not be responsible for any failure to meet such requirements. Following are URLs where you can obtain information on other Texas Instruments products and application solutions: Products...
  • Page 23 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Texas Instruments DAC7741EVM...

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