DAC60004 datasheet(26/44 Pages) TI2

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OUT

POS

NEG

POS

NEG

DAC

NEG

POS

VOUT

RFB

RNEG

RPOS

OPA277

DACx0004

DACPOS

DACNEG

VOUTA

VOUTB

DAC80004, DAC70004, DAC60004

SLASED6D – APRIL 2016 – REVISED DECEMBER 2017

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Product Folder Links: DAC80004 DAC70004 DAC60004

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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

9.2 Typical Application - Digitally Controlled Asymmetric Bipolar Output

Figure 58. Asymmetric Bipolar Output Block Diagram

9.2.1 Design Requirements

This design requires two channels of the DACx0004 to generate a bipolar output. The design is very flexible and

allows for many different configurations. Typically, one channel is used to finely control the output, while the other

is used to offset the output. The direction of the offset depends on which channel is used as an offset. DACPOS

provides a positive offset and DACNEG has a negative offset.

9.2.2 Detailed Design Procedure

The output of each DAC can be modified via the digital interface and the gain of each output can be modified

independently by changing the external resistors. In order for the gain of each offset to be independent,

Equation 2 must be true.

(2)

The output voltage range, VOUT, is adjusted according to Equation 3. Keep in mind that Equation 3 is only true

when Equation 2 is true.

(3)

Each DAC outputs a voltage from 0 to REFIN. As an example, if DACPOS gain is 1, DACNEG gain is 2 and RFB =

2 kΩ, then RPOS = 2 kΩ, RNEG = 1 kΩ and RA = 1 kΩ. With the correct digital implementation it gives the output

an effective output range of ±15 V, with discrete 16-bit steps.

DAC60004 Datasheet(PDF) 26 Page - Texas Instruments

DAC60004 Datasheet(HTML) 26 Page - Texas Instruments

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