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1 EVM Overview

1.1 Features

1.2 Introduction

User's Guide

SLAU190A – February 2006 – Revised May 2007

DAC8806/20EVM

This user’s guide describes the characteristics, operation, and use of the DAC8806/20

evaluation module (EVM). This EVM features either the DAC8806 (14-bit) or DAC8820

(16-bit) — a current output, multiplying digital-to-analog converter (DAC) with parallel

digital inputs in a convenient modular EVM form factor. A complete circuit description, a

schematic diagram, and bill of materials are included.

Contents

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

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

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

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

5 EVM Operation ...................................................................................... 4

6 EVM Bill of Materials and Schematic ............................................................ 4

List of Figures

1 Shunt Jumper Options for 2- and 4-Quadrant Operation ...................................... 2

List of Tables

1 J2 Pinout ............................................................................................. 2

2 J5 Pinout ............................................................................................. 4

3 Bill of Materials ...................................................................................... 5

• Full-featured evaluation board featuring either the DAC8806 and DAC8820, parallel digital-to-analog

converters (DAC)

• Onboard reference selection options for ± 10 V or external source

• High-speed parallel interface

• Compatible with the 5-6K and HPA-MCU Interface Boards for use with a variety of Texas Instruments

DSP Starter Kits (DSK) and micro controllers such as the TMS470

• Compatible with the TI Analog Interface Board from Avnet for use with Xilinx FPGAs

The DAC8806 and DAC8820 devices are 14-bit and 16-bit, multiplying DACs with a microprocessor and

TMS320 DSP-compatible parallel interface. The data bits are double-buffered so that the output can be

updated asynchronously using the LDAC pin. During normal operation, the DAC8806 and DAC8820

devices dissipate a mere 25 µ W at a 5-V supply and 8.25 µ W at a 3-V supply.

Developed for a wide range of supply voltages, these DACs can be operated from 2.7 V to 5.5 V. The

full-scale current output for these devices is 1.66 mA with a 10-V reference applied and has a typical

settling time of 0.5 µ s.

C5000, C6000 are trademarks of Texas Instruments.

SLAU190A – February 2006 – Revised May 2007 DAC8806/20EVM 1

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Summary of content (8 pages)

PAGE 1
User's Guide SLAU190A – February 2006 – Revised May 2007 DAC8806/20EVM This user’s guide describes the characteristics, operation, and use of the DAC8806/20 evaluation module (EVM). This EVM features either the DAC8806 (14-bit) or DAC8820 (16-bit) — a current output, multiplying digital-to-analog converter (DAC) with parallel digital inputs in a convenient modular EVM form factor. A complete circuit description, a schematic diagram, and bill of materials are included. 1 2 3 4 5 6 Contents EVM Overview ..
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www.ti.com Analog Interface The EVM ships with either the DAC8806 or DAC8820 installed. The chip select function to the installed device is decoded through an SN74AHCT138 address decoder allowing the EVM user to stack multiple EVMs together and address them independently. Up to three DAC8806/20EVM boards can be used together. 2 Analog Interface For maximum flexibility, the modular DAC8806/20EVM is designed for easy interfacing to multiple analog sources.
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www.ti.com Power Supplies 3.1 Parallel Control Samtec part numbers SSW-110-22-F-D-VS-K and TSM-110-01-T-DV-P provide a convenient 10-pin, dual-row, header/socket combination at J6. This header/socket provides access to the digital control pins of the EVM. Consult Samtec at www.samtec.com or 1-800-SAMTEC-9 for a variety of mating connector options. Pin Number Signal J6.1 DC_CSa Description J6.3 WR Write Strobe – not used on this EVM. J6.5 RD Read Strobe – not used on this EVM. J6.
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www.ti.com EVM Operation Table 2. J5 Pinout Signal Pin Number Signal +VA – Used by U2, U3, and U5, +15 V max 1 2 –VA – Used by U5, -15 V max +5VA – Unused 3 4 -5VA – Unused DGND 5 6 AGND +1.8VD – Unused 7 8 +VD – Unused +3.3VD – Used with W6 – provides voltage supply to the DAC 9 10 +5VD – Used with W6 – provides voltage supply to the DAC Alternate power sources can be applied via various test points located on the EVM. See the schematic at the end of this document for details.
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www.ti.com EVM Bill of Materials and Schematic Table 3. Bill of Materials 6.1 Designators Description Manufacturer Mfg. Part Number C1 1.0µF, 0603, Ceramic, X5R, 10V TDK C1608X5R1A105K C2 100pF Ceramic, 0805, COG, 50V TDK C2012C0G1H101J C3–C5, C7–C9, C13–C15 0.
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1 2 3 4 5 6 Revision History REV +VA ECN Number A C8 Approved Initial Release TH /WR 7 DATA 0.1µF LDAC U2 3 6 REFP 2 REF OPA227 D 4 7 8 D /RST RefTest +VA 4 2 4 3 TEMP GND 5 TRIM 1 4 U1 REF102 +VA U4 2 -IN NC +IN V+ REF Output V- Sense +3.3VD 8 9 7 5 3 1 OUT 1 3 C5 +3.3VD 7 W2 6 U7 0.1µF 5 /WR C3 0.1µF C7 0.
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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.