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MCP4725 Datasheet(PDF) 36 Page - Microchip Technology

Part # MCP4725
Description  12-Bit Digital-to-Analog Converter with EEPROM Memory in SOT-23-6
PDF  50 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MCP4725 Datasheet(HTML) 36 Page - Microchip Technology

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MCP4725
DS22039D-page 36
© 2009 Microchip Technology Inc.
8.5.3
BUILDING A “WINDOW” DAC
Some sensor applications require very high resolution
around the set point or threshold voltage.
Example 8-2 shows an example of creating a “window”
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
resolution is increased greatly.
EXAMPLE 8-2:
Single-Supply “Window” DAC.
VTRIP
R1
R2
0.1 µF
Comparator
R3
VCC-
Where: Dn = DAC Input Code (0 – 4095)
VCC+
VCC+
VCC-
VOUT
V
OUT
V
DD
Dn
2
12
-------
×
=
R
23
R
2R3
R
2
R
3
+
-------------------
=
V
23
V
CC+R2
()
V
CC-R3
()
+
R
2
R
3
+
------------------------------------------------------
=
V
trip
V
OUTR23
V
23R1
+
R
2
R
23
+
---------------------------------------------
=
R1
R23
V23
VOUT
VO
Thevenin
Equivalent
Rsense
To MCU
(MASTER)
R R
MCP4725
VDD
VOUT A0
SCL
VSS
1
2
3
4
5
6
VDD SDA
10 µF
0.1 µF
VDD



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