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DAC7741EVM
User’s Guide
October 2002 DAP EVMs
SLAU093
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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. All products are sold subject to TI’s terms and conditions of sale supplied at the t
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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
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EVM WARNINGS AND RESTRICTIONS It is important to operate this EVM within the input voltage range of ±15 V and the output voltage range of ±10 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
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Information About Cautions and Warnings Preface Read This First About This Manual This user’s guide describes the characteristics, operation, and the use of the DA7741 evaluation module. 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. How to Use This Manual This document contains the following chapters: Chapter 1—EVM Overview Chapter 2—Physical Des
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Trademarks Related Documentation From Texas Instruments To obtain a copy of any of the following TI documents, call the Texas Instru- ments Literature Response Center at (800) 477 – 8924 or the Product Informa- tion Center (PIC) at (972) 644 – 5580. When ordering, identify this manual by its title and literature number. Updated documents can also be obtained through our website at www.ti.com. Data Sheets: Literature Number: DAC7741 SBAS248 REF102 PDS-900E OPA627 PDS-998H Questions about this or
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Contents Contents 1 EVM Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 1.1 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 1.2 Power Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 1.2.1 Supply Voltage . . . . . . . . . .
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Contents Tables 2-1 Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7 3-1 Factory Default Jumper Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2 3-2 Unity Gain Output Jumper Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3 3-3 Gain of Two Output Jumper Settings . . . . . . . . . .
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Chapter 1 EVM Overview This chapter gives a general overview of the DAC7741 evaluation module (EVM), and describes some of the factors that must be considered in using this module. Topic Page 1.1 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 1.2 Power Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 1.3 EVM Basic Functions . . . . . . . . . . . . . . . . . . . . . . . .
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Features 1.1 Features This EVM features the DAC7741 digital-to-analog converter. The DAC7741 EVM is a simple evaluation module designed for a quick and easy way to evaluate the functionality of the high resolution, single-channel, and parallel input DAC. This EVM features a parallel interface to communicate to any host processor base system. 1.2 Power Requirements The following sections describe the power requirements of this EVM. 1.2.1 Supply Voltage The dc power supply requirement for the digi
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EVM Basic Functions The REF102 precision reference derives its power of ±15-V supply through J10 or J7 terminal. The (plus) 15 V connects through J10-1 or J7-2 terminals, while the (minus) -15 V connects through J10-3 or J7-4 terminals. They are both referenced to analog ground through J10-2 and J7-1. The DAC7741 has a REFEN pin to enable the internal reference circuit or disable it and select an external reference source. The REFEN pin can be hardware driven through W2 jumper. Likewise, it can
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EVM Basic Functions A block diagram of the EVM is shown below in the Figure 1-1. Figure 1-1. EVM Block Diagram +15 V +15 V GND -15 V -15 V (J6) VCC GND (J7) VDD VCC VSS VDD External Reference VSS W14 Module Output TP1 W4 REFEN Buffer LDAC Module W3 +REF DAC Out IN RST Ext Ref RSTSEL (J2) W13 Input (J4) REF REF (J3) IN out (J5) DAC Module CS R/W TP2 DB15 (MSB) (J1) DB1 (LSB) 1-4
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Chapter 2 Physical Description This chapter describes the physical characteristics and PCB layout of the EVM and lists the components used on the module. Topic Page 2.1 PCB Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2 2.2 Bill of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7 Physical Description 2-1
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PCB Layout 2.1 PCB Layout The EVM is constructed on a four-layer printed-circuit board using a copper-clad FR-4 laminate material. The printed-circuit board has a dimension of 99,06 mm (3.90 inch)× 104,14 mm (4.10 inch), and the board thickness is 1,57 mm (0.062 inch). Figures 2-1 through 2-6 show the individual artwork layers. Figure 2-1. Layer One (Top Silkscreen) 2-2
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PCB Layout Figure 2-2. Layer Two (Ground Plane) Physical Description 2-3
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PCB Layout Figure 2-3. Layer 3 (Power Plane) 2-4
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PCB Layout Figure 2-4. Layer 4 (Bottom Plane) Physical Description 2-5
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PCB Layout Figure 2-5.Drill Drawing 2-6
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Bill of Materials 2.2 Bill of Materials Table 2-1.Parts List Item # Qty Designator Manufacturer Part Number Description 1 1 C8 Panasonic ECJ3VB1C105K 1 µ F, 1206 multilayer ceramic capacitor 2 2 C9 C10 Panasonic ECUV1H103KBM 0.01 µ F, 1206 multilayer ceramic capacitor 3 5 C1 C2 C3 C7 Panasonic ECJ3VB1C104K 0.1 µ F, 1206 multilayer ceramic C13 capacitor 4 1 C12 Panasonic ECUV1H102JCH 1 nF, 1206 multilayer ceramic capacitor 5 5 C4 C5 C6 C11 Kemet C1210C106K8PAC 10 µ F, 1210 multilayer ceramic X5R
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Bill of Materials (This page has been left blank intentionally.) 2-8
