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DAC8811ICDGKR bảng dữ liệu(PDF) 11 Page - Texas Instruments |
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DAC8811ICDGKR bảng dữ liệu(HTML) 11 Page - Texas Instruments |
11 / 29 page OUT REF CODE V V x 65536 D/A Converter Power-On Reset DAC Register Shift Register 16 16 RFB IOUT GND VDD VREF CS CLK SDI DAC8811 11 DAC8811 www.ti.com SLAS411D – NOVEMBER 2004 – REVISED FEBRUARY 2016 Product Folder Links: DAC8811 Submit Documentation Feedback Copyright © 2004–2016, Texas Instruments Incorporated 8 Detailed Description 8.1 Overview The DAC8811 is a single channel current output, 16-bit digital-to-analog converter (DAC). The device includes a 3-wire serial interface to communicate with most DSPs. 8.2 Functional Block Diagram 8.3 Feature Description The DAC8811 is a single channel current output, 16-bit digital-to-analog converter (DAC). The architecture, illustrated in Figure 18, is an R-2R ladder configuration with the three MSBs segmented. Each 2R leg of the ladder is either switched to GND or the IOUT terminal. The IOUT terminal of the DAC is held at a virtual GND potential by the use of an external I/V converter op amp. The R-2R ladder is connected to an external reference input VREF that determines the DAC full-scale current. The R-2R ladder presents a code independent load impedance to the external reference of 5 k Ω ±25%. The external reference voltage can vary in a range of -15 V to 15 V, thus providing bipolar IOUT current operation. By using an external I/V converter and the DAC8811 RFB resistor, output voltage ranges of -VREF to VREF can be generated. Figure 18. Equivalent R-2R DAC Circuit When using an external I/V converter and the DAC8811 RFB resistor, the DAC output voltage is given by Equation 1: (1) |
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