DAC8563 datasheet(39/56 Pages) TI1

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OUT

REFOUT

DAC8562

OPA140

5.5V

18V

–18V

–

OUT

REFOUT

= G × V

2 ×

65,536

OUT

= 20 ×

10 V

65,536

DAC8562, DAC8563

DAC8162, DAC8163

DAC7562, DAC7563

www.ti.com

SLAS719C

– AUGUST 2010 – REVISED JUNE 2011

UP TO

±15-V BIPOLAR OUTPUT USING THE DAC8562

The DAC8562 is designed to be operate from a single power supply providing a maximum output range of AVDD

volts. However, the DAC can be placed in the configuration shown in Figure 95 in order to be designed into

bipolar systems. Depending on the ratio of the resistor values, the output of the circuit can range anywhere from

±5 V to ±15 V. The design example below shows that the DAC is configured to have its internal reference

enabled and the DAC8562 internal gain set to two, however, an external 2.5-V reference could also be used

(with DAC8562 internal gain set to two).

Figure 95. Bipolar Output Range Circuit Using DAC8562

The transfer function shown in Equation 5 can be used to calculate the output voltage as a function of the DAC

code, reference voltage and resistor ratio:

(5)

where:

DIN = decimal equivalent of the binary code that is loaded to the DAC register, ranging from 0 to 65,535 for

aaa DAC8562 (16 bit).

VREFOUT = reference output voltage with the internal reference enabled from the DAC VREFIN/VREFOUT pin

G = ratio of the resistors

An example configuration to generate a

±10-V output range is shown below in Equation 6 with G = 4 and

VREFOUT = 2.5 V:

(6)

In this example, the range is set to

±10 V by using a resistor ratio of four, VREFOUT of 2.5 V, and DAC8562

internal gain of two. The resistor sizes must be selected keeping in mind the current sink/source capability of the

DAC8562 internal reference. Using larger resistor values, for example R = 10 k

Ω or larger is recommended. The

op amp is selectable depending on the requirements of the system.

The DAC8562EVM and DAC7562EVM boards have the option to evaluate the bipolar output application by

installing the components on the pre-placed footprints. For more information see either the DAC8562EVM or

DAC7562EVM product folder.

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Product Folder Link(s): DAC8562 DAC8563 DAC8162 DAC8163 DAC7562 DAC7563

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