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User's Guide

SBAU160–October 2009

DAC8234EVM

This user's guide describes the characteristics, operation, and use of the DAC8234EVM. The evaluation

module (EVM) is an evaluation board that allows for quick and easy evaluation of the DAC8234. The

DAC8234 is a quad, high-accuracy, 14-bit, R-2-R digital-to-analog converter (DAC). The device features

low-power operation, good linearity, and the ability to use different reference voltages for the output

channels. This EVM allows evaluation of all aspects of the DAC8234. Complete circuit descriptions,

schematic diagrams, and bill of material are included in this document.

The following related documents are available through the Texas Instruments web site at

http://www.ti.com.

EVM-Compatible Device Data Sheets

Device Literature Number

DAC8234 SBAS464

REF5025 SBOS410

REF5050 SBOS410

OPA211 SBOS377

TL750L08 SLVS017

All trademarks are the property of their respective owners.

SBAU160–October 2009 DAC8234EVM

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Summary of content (12 pages)

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User's Guide SBAU160 – October 2009 DAC8234EVM DAC8234EVM This user's guide describes the characteristics, operation, and use of the DAC8234EVM. The evaluation module (EVM) is an evaluation board that allows for quick and easy evaluation of the DAC8234. The DAC8234 is a quad, high-accuracy, 14-bit, R-2-R digital-to-analog converter (DAC). The device features low-power operation, good linearity, and the ability to use different reference voltages for the output channels.
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EVM Overview 1 2 3 4 5 6 7 www.ti.com Contents EVM Overview ............................................................................................................... Analog Interface ............................................................................................................. Digital Interface .............................................................................................................. Power Supplies ..................................................................
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Analog Interface www.ti.com 2 Analog Interface For maximum flexibility, the DAC8234EVM can interface to multiple analog sources. Samtec part numbers SSW-110-22-F-D-VS-K and TSM-110-01-T-DV-P provide a 10-pin, dual-row, header at J1. This header provides access to the analog input and output pins of the DAC. Consult Samtec at http://www.samtec.com or call 1-800-SAMTEC-9 for a variety of mating connector options. Table 1 summarizes the pinouts for analog interface J1. Table 1.
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Digital Interface 3.1 www.ti.com Serial Data Interface Samtec part numbers SSW-110-22-F-D-VS-K and TSM-110-01-T-DV-P provide a 10-pin, dual-row, header/socket combination at J2. This header/socket provides access to the digital control and serial data pins from both J2A (top side) and J2B (bottom side) of the connector. Consult Samtec at http://www.samtec.com or call 1-800-SAMTEC-9 for a variety of mating connector options. Table 2 describes the serial interface pins. Table 2.
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Power Supplies www.ti.com 4 Power Supplies Samtec part numbers SSW-105-22-F-D-VS-K and TSM-105-01-T-DV-P provide a 5-pin, dual-row, header/socket combination at J3. Table 3 lists the configuration details for J3. The voltage inputs to the DAC can be applied directly to the device. The DAC8234 requires multiple power supplies to operate. AVDD, AVSS, DVDD, and IOVDD are required to properly power the DAC. Table 3. J3 Configuration: Power-Supply Input Pin No. Pin Name Function Required J3.1 +VA +4.
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EVM Operation www.ti.com Note that if an external reference voltage is input to J1.20, it will be filtered through a first-order, low-pass RC filter. To input your own reference signal without this filter, connect the reference signal directly to TP1 or TP2. Figure 1 shows the reference test points on the EVM. Figure 1. Reference Test Points 6 EVM Operation This section provides information on the analog input, digital control, and general operating conditions of the DAC8234EVM. 6.
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EVM Operation www.ti.com 6.3 Default Jumper Settings and Switch Positions Figure 2 shows the jumpers found on the EVM and the respective factory default conditions for each. Figure 2. DAC8234EVM Default Jumper Locations Jumper JP1 controls whether the LDAC signal is controlled by J2.15 or J2.17. By default, the LDAC signal is controlled by J2.17 but can be changed using JP1. Jumpers JP2, JP3, JP4, and JP5 are used to control the gain of the individual DAC channels.
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Schematics and Layout www.ti.com Switch S1 allows the user to pull down four control signals to ground. LDAC, Uni/Bip B, RST, and Uni/Bip A can be pulled low using the switch. By default, switch position S1.1 is open, causing LDAC to be connected to ground. Switches S1.2 and S1.4 are open to short-circuit Uni/Bip A and Uni/Bip B to ground. This configuration sets the DAC8234 to bipolar mode (default). Figure 3 shows the default settings for switch S1. Figure 3.
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Schematics and Layout www.ti.com space Table 4. DAC8234EVM Bill of Materials (1) (1) (2) Item No. Qty Ref Des Description Vendor N/A Printed wiring board Texas Instruments C1, C6, C10, C11, C14, C15 Capacitor ceramic, 1.
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1 2 3 4 6 5 REVISION HISTORY REV IOVDD +VA -VA ENGINEERING CHANGE NUMBER APPROVED +5VD LDAC SDO C3 10uF C1 1uF CS C4 10uF C6 1uF C2 10uF C5 10uF SCLK D Uni/Bip A Uni/Bip B RST 10 48 36 37 1 25 24 19 12 42 GPIO-0 8 7 6 5 GPIO-1 GPIO-1 Uni/Bip A S1 DIPSWITCH-4 Uni/Bip B RST 29 30 14 28 33 K1 A1 D1A REFGND-A NC NC NC NC NC NC NC NC 200k 7 -VA J1A 10uF 23 21 22 20 JP9 46 44 45 43 Vout-2 RFB1-2 RFB2-2 SGND-2 1 3 5 7 9 11 13 15 17 19 JP2 2 4 6 8 10 12 14 16 18 20 A0
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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.