DAC80504 datasheet(38/50 Pages) TI2

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OUT

REF

2.5V

OUT

REF

CODE

· §

¸ ¨

¹ ©

DACx0504

GND

OPA192

VDAC

15 V

±15 V

VREF

VOUT

REF

DAC80504, DAC70504, DAC60504

SBAS871C – AUGUST 2017 – REVISED JANUARY 2019

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Product Folder Links: DAC80504 DAC70504 DAC60504

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9.2 Typical Application

The DACx0504 is designed for single-supply operation; however, a bipolar output is also possible using the

circuit shown in Figure 76.

Figure 76. Bipolar Operation Using the DACx0504

9.2.1 Design Requirements

The circuit shown in Figure 76 gives a bipolar output voltage at VOUT. When GAIN = 1, VOUT can be calculated

using Equation 4:

where

•

VOUT(CODE) = output voltage versus code

•

CODE = 0 to 2

n – 1. This is the digital code loaded to the DAC

•

VREF = reference voltage applied to the DACx0504

•

n = resolution in bits

(4)

Table 18. Design Parameters

PARAMETER

VALUE

VOUT

±10 V

VREF

2.5 V

9.2.2 Detailed Design Procedure

The bipolar output span can be calculated through Equation 4 by defining a few parameters, the first being the

value for the reference voltage. Once a reference voltage is chosen, the gain resistors can be set accordingly by

determining the desired VOUT at code 0 and code 2

n. For a V

REF of 2.5 V and a desired output voltage range of

±10 V the calculation is as follows.

CODE = 0:

(5)

Setting the equation to minimum output span, VOUT(0) = –10 V, will reduce the equation to: R3/R1 = 4:

CODE = 4096:

Setting the equation to maximum output scan, VOUT(4096) = 10 V, and R3/R1 = 4 will reduce the equation to:

R3/R2 = 3

It is important to note that the maximum code of a 12-bit DAC is 4095; code 4096 was used to simplify the

equation above. For practical use, the true output span will encompass a range of –10 V to (10 V – 1 LSB),

which in this case is –10 V to 9.995 V.

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