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User's Guide

SLAU301–November 2009

DACxx68EVM

The DACxx68 Evaluation Module is an evaluation board containing all the necessary components to

evaluate the eight-channel DAC7568, DAC8168, or DAC8568 series of high-performance digital-to-analog

converters from Texas Instruments. The EVM is designed so that a single printed-circuit board (PCB)

supports the entire family of high-speed, 12- to 16-bit serial DACs. The EVM is provided with Grade C

devices which reset to zero and have a full-scale output range of 0 V to 5 V.

The modular EVM form factor allows for direct evaluation of the DAC’s performance and operating

characteristics. This EVM is compatible with the 5-6K Interface Board (SLAU104) from Texas Instruments

as well as the HPA-MCU Interface Board (SLAU106).

Contents

1 EVM Overview ............................................................................................................... 2

2 Analog Interface ............................................................................................................. 2

3 Digital Interface .............................................................................................................. 2

4 Power Supplies .............................................................................................................. 3

4.1 DAC Power ......................................................................................................... 3

4.2 Stand-Alone Operation ............................................................................................ 3

5 EVM Operation .............................................................................................................. 3

5.1 Analog Output ...................................................................................................... 3

5.2 Reference In/Out ................................................................................................... 4

5.3 Digital Control ...................................................................................................... 4

5.4 SYNC ................................................................................................................ 4

5.5 LOAD DAC (LDAC) ................................................................................................ 4

5.6 CLEAR (CLR) ...................................................................................................... 5

5.7 Default Jumper Locations ......................................................................................... 5

6 Bill of Material and EVM Schematic ...................................................................................... 6

6.1 Bill of Materials ..................................................................................................... 6

6.2 EVM Schematic .................................................................................................... 7

7 Related Documentation from Texas Instruments ....................................................................... 8

List of Figures

1 Top Layer Assembly Drawing and Jumper Locations.................................................................. 5

List of Tables

1 Digital Control ............................................................................................................... 2

2 J3 Power Input .............................................................................................................. 3

3 EVM Default Jumper Settings............................................................................................. 5

4 Bill of Materials .............................................................................................................. 6

SLAU301–November 2009 DACxx68EVM

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Summary of content (10 pages)

PAGE 1
User's Guide SLAU301 – November 2009 DACxx68EVM The DACxx68 Evaluation Module is an evaluation board containing all the necessary components to evaluate the eight-channel DAC7568, DAC8168, or DAC8568 series of high-performance digital-to-analog converters from Texas Instruments. The EVM is designed so that a single printed-circuit board (PCB) supports the entire family of high-speed, 12- to 16-bit serial DACs.
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EVM Overview 1 EVM Overview • • • • 2 www.ti.com Full-featured Evaluation Board for the 12-/14-/16-bit, eight-channel DAC7568, DAC8168, or DAC8568 digital-to-analog converters Onboard reference and buffer circuits High-speed serial interface Modular design for use with a variety of DSP and DACxx68 DAC Controller Interface Boards Analog Interface For maximum flexibility, the DACxx68EVM is designed for easy interfacing to multiple analog sources.
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Power Supplies www.ti.com Table 1. Digital Control (continued) Pin Number Signal Description J2.4 J2.10 GND System (EVM) ground J2.18 4 Power Supplies The DACxx68EVM board is built with grade C devices and requires a single +5 V DC for proper operation. This 5-V supply powers the onboard voltage reference (U2) and the common-mode voltage output buffer (U3). When used in combination with one of the DAP Interface boards, J3 provides connection to the common power bus described in document SLAA185.
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EVM Operation 5.2 www.ti.com Reference In/Out The DAC8568, DAC8168, and DAC7568 provide the ability to use an internal reference or an external reference in the range of 0 V to 2.5 V. The DACxx58 internal reference is powered OFF by default. The following sections describe how to apply an external reference or use the internal reference. 5.2.1 External Reference provides an external reference via JP3 (shorted pins 1-2 by default) from U2, a precision REF5025 source of 2.5 VDC.
PAGE 5
EVM Operation www.ti.com When the shunt on JP6 is moved to pins 2-3, a user-provided GPIO input may be applied to the LDAC pin via J1.15. This external input acts as an interrupt input to a DSP host processor which can in turn trigger a serial transfer to the DAC. JP2 can be used to hold the LDAC input to the DAC at ground potential if synchronous updates are required. 5.6 CLEAR (CLR) Jumper JP1 is provided to allow the manual application of a CLR input pulse.
PAGE 6
Bill of Material and EVM Schematic 6 www.ti.com Bill of Material and EVM Schematic Table 4 contains a complete bill of materials for the DACxx68EVM. The schematic diagram also is provided for reference. 6.1 Bill of Materials Table 4. Bill of Materials Designators Description Manufacturer Mfg. Part Number C1, C11 CAP CER 10UF 6.
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TP4 SLAU301 – November 2009 Submit Documentation Feedback Copyright © 2009, Texas Instruments Incorporated GPIO0 DGND GPIO1 GPIO2 DGND GPIO3 GPIO4 SCL DGND SDA CNTL CLKX CLKR FSX FSR DX DR INT TOUT GPIO5 1 3 5 7 9 JP4 FSX R6 R3 DAUGHTER-POWER 2 4 6 8 10 TP1 CNTL +VA -VA +5VA -5VA DGND AGND +1.8VD VD1 +3.
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Related Documentation from Texas Instruments 7 www.ti.com Related Documentation from Texas Instruments The following devices data sheet is DACxx68EVM compatible. • DAC7568, DAC8168, DAC8568, 12-/14-/16-Bit, Octal-Channel, Ultra-Low Glitch, Voltage Output Digital-to-Analog Converters With 2.
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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.
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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.