Datasheet

© 2010 Microchip Technology Inc. DS22187E-page 53
MCP4728
7.6 Application Examples
The MCP4728 device is a rail-to-rail output DAC
designed to operate with a V
DD
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 V
OUT
OF
EACH CHANNEL
DAC Channel
Voltage
Reference
DAC Output
(V
OUT
)
V
OUT
A
V
DD
V
DD
/2
V
OUT
B
V
DD
V
DD
- 1 LSB
V
OUT
C
Internal 2.048V
V
OUT
D
Internal 4.096V