DAC8811 Datasheet, PDF (11/29 Pages) Texas Instruments – 16-Bit, Serial Input Multiplying Digital-to-Analog Converter

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8 Detailed Description
DAC8811
SLAS411D – NOVEMBER 2004 – REVISED FEBRUARY 2016
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
V_DD
V_REF
CS
CLK
SDI
Power-On
Reset
DAC8811
D/A
Converter
16
DAC
Register
16
Shift
Register
R_FB
I_OUT
GND
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 I_OUT terminal. The I_OUT 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 V_REF that determines the DAC full-scale current. The R-2R ladder presents a code independent load
impedance to the external reference of 5 kΩ ±25%. The external reference voltage can vary in a range of -15 V
to 15 V, thus providing bipolar I_OUT current operation. By using an external I/V converter and the DAC8811 R_FB
resistor, output voltage ranges of -V_REF to V_REF can be generated.
Figure 18. Equivalent R-2R DAC Circuit
When using an external I/V converter and the DAC8811 R_FB resistor, the DAC output voltage is given by
Equation 1:
V_OUT
V_REF
x
CODE
65536
(1)
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