MCP4725 Microchip Technology, MCP4725 Datasheet - Page 30

• Manufacturer Part Number: MCP4725
• Description: 12-Bit Digital-to-Analog Converter
• Manufacturer: Microchip Technology

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MCP4725
8.5.3
Some sensor applications require very high resolution
around the set point or threshold voltage.
Example 8-2
around the threshold using a voltage divider network
with a pull-up and pull-down resistor. In the circuit, the
output voltage range is scaled down, but its step reso-
lution is increased greatly.
EXAMPLE 8-2:
DS22039C-page 30
BUILDING A “WINDOW” DAC
shows an example of creating a “window”
1
2
3
V
V
V
0.1 µF
Thevenin
Equivalent
MCP4725
OUT
SS
DD
V
OUT
Single-Supply “Window” DAC.
SCL
SDA
A0
=
10 µF
V
6
5
4
DD
-------
2
D
12
R
V
V
V
23
23
trip
OUT
V
DD
=
=
=
------------------
R
(
---------------------------------------------------- -
R R
V
R
V
------------------------------------------- -
2
CC+
2
OUT
+
V
R
R
DD
R
3
R
R
1
3
R
R
2
R
R
2
2
23
where D = DAC Input Code (0 – 4095)
)
+
3
2
+
+
V
+
R
V
R
(
CC+
23
CC-
V
V
3
23
CC-
R
R
1
To MCU
(MASTER)
3
R
)
sense
V
OUT
0.1 µF
V
TRIP
R
1
V
© 2007 Microchip Technology Inc.
23
R
Comparator
23
V
O
V
V
CC+
CC-