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DAC124S085CIMM Datasheet(PDF) 19 Page - Texas Instruments

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Part No. DAC124S085CIMM
Description  DAC124S085 12-Bit Micro Power Quad Digital-to-Analog Converter With Rail-to-Rail Output
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

DAC124S085CIMM Datasheet(HTML) 19 Page - Texas Instruments

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DAC124S085
DIN
SCLK
SYNC
VOUT
0.1 PF
+
10 PF
+
-
+5V
R1
R2
-5V
+5V
±5V
10 pF
Copyright © 2016, Texas Instruments Incorporated
19
DAC124S085
www.ti.com
SNAS348G – MAY 2006 – REVISED APRIL 2016
Product Folder Links: DAC124S085
Submit Documentation Feedback
Copyright © 2006–2016, Texas Instruments Incorporated
9 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
9.1 Application Information
Figure 35 is an example of the DAC124S085 in a typical application. This circuit is basic and generally requires
modification for specific circumstances.
9.2 Typical Application
9.2.1 Bipolar Operation
The DAC124S085 is designed for single-supply operation and thus has a unipolar output. However, a bipolar
output may be obtained with the circuit in Figure 35. This circuit provides an output voltage range of ±5 V. A rail-
to-rail amplifier must be used if the amplifier supplies are limited to ±5 V.
Figure 35. Bipolar Operation
9.2.1.1 Design Requirements
The DAC124S085 uses a single supply.
The output is required to be bipolar with a voltage range of ±5 V.
Dual supplies are used for the output amplifier.
9.2.1.2 Detailed Design Procedure
The output voltage of this circuit for any code is found with Equation 2.
VO = (VA × (D / 4096) × ((R1 + R2) / R1) – VA × R2 / R1
where
D is the input code in decimal form
(2)
Equation 3 is calculated with VA = 5 V and R1 = R2.
VO = (10 × D / 4096) – 5 V
(3)
A list of rail-to-rail amplifiers suitable for this application are indicated in Table 2.


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