MCP4728 datasheet(53/66 Pages) MICROCHIP

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DS22187C-page 53

MCP4728

7.6

Application Examples

The MCP4728 device is a rail-to-rail output DAC

designed to operate with a VDD range of 2.7V to 5.5V.

Its output amplifier of each channel is robust enough to

drive

common,

small-signal

loads

directly,

thus

eliminating the cost and size of external buffers for

most applications. Since each channel has its own

configuration bits for selecting the voltage reference,

gain, power-down, etc., the MCP4728 device offers

great simplicity and flexibility to use for various DAC

applications.

7.6.1

DC SET POINT OR CALIBRATION

VOLTAGE SETTINGS

A common application for the MCP4728 device is a

digitally-controlled set point or a calibration of variable

parameters such as sensor offset or bias point.

Figure 7-3 shows an example of the set point settings.

Let us consider that the application requires different

trip voltages (Trip 1 - Trip 4). Assuming the DAC output

voltage requirements are given as shown in Table 7-1,

examples of sending the Sequential Write and Fast

Write commands are shown in Figure 7-4 and

Figure 7-5.

TABLE 7-1:

EXAMPLE: SETTING VOUT OF

EACH CHANNEL

DAC Channel

Voltage

Reference

DAC Output

(VOUT)

VOUT A

VDD

VDD/2

VOUT B

VDD

VDD - 1 LSB

VOUT C

Internal

2.048V

VOUT D

Internal

4.096V

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