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User's Guide
SBAU159–October 2009
DAC7716EVM
DAC7716EVM
This user's guide describes the characteristics, operation, and use of the DAC7716EVM. The evaluation
module (EVM) is an evaluation board that allows for quick and easy evaluation of the DAC7716. The
DAC7716 is a quad, high-accuracy, 12-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 o
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EVM Overview www.ti.com Contents 1 EVM Overview ............................................................................................................... 2 2 Analog Interface ............................................................................................................. 3 3 Digital Interface .............................................................................................................. 3 4 Power Supplies .........................................................
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www.ti.com Analog Interface 2 Analog Interface For maximum flexibility, the DAC7716EVM 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. J1: Analog Interface
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Digital Interface www.ti.com 3.1 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. (1) Table 2. J2: Serial Int
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www.ti.com Power Supplies 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 DAC7716 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 DAC7716EVM. 6.1 Analog Outpu
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www.ti.com EVM Operation 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. DAC7716EVM 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. By default, the jumpers are re
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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 DAC7716 to bipolar mode (default). Figure 3 shows the default settings for switch S1. Figure 3. Default Settings for Switch S1 (LD
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www.ti.com Schematics and Layout space (1) Table 4. DAC7716EVM Bill of Materials Item No. Qty Ref Des Description Manufacturer Mfr Part Number 1 1 N/A Printed wiring board Texas Instruments 6508538 2 6 C1, C6, C10, Capacitor, ceramic 1.0µF 16V X5R TDK C1608X5R1C105K C11, C14, C15 10% 0603 3 7 C2, C3, C4, Capacitor, ceramic 10µF 25V X5R MuRata GRM31CR61E106KA12L C5, C7, C8, 1206 10% C9 4 4 C12, C13, Capacitor, ceramic 10µF 10V 0603 Panasonic ECJ-1VB1A106M C16, C 17 X5R 20% 5 0 D1 Not installed N/
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1 2 3 4 5 6 REVISION HISTORY REV ENGINEERING CHANGE NUMBER APPROVED IOVDD +VA -VA +5VD LDAC C3 C4 C6 SDO C1 10uF 10uF 1uF 1uF C2 C5 CS 10uF 10uF SCLK D D GPIO-0 1 2 3 4 GPIO-1 C7 5 6 Uni/Bip A 7 8 R6 R7 R8 R9 R10 R11 +VA 9 10 10k 10k 10k 10k 10k 10k Uni/Bip B U2 10uF 11 12 RST 2 D1B OPA227 13 14 6 15 16 3 17 18 C8 19 20 R1 R16 CS 2 34 33 CS Vmon -VA R2 Serial Header Top SCLK 3 J1A 33 200k SCLK R3 10uF J2A SDI 4 15 1 2 Vout-0 33 SDI Vout-0 A0(-) A0(+) R4 SDO Vout-1 33 5 17 3 4 SDO RFB1-0 A1(-) A1
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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. As such, the goods being provided are not intended to be
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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
