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Giải thích chi tiết về linh kiện  16-Bit, Serial Input Multiplying Digital-to-Analog Converter
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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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