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MCP4922T-EMS Datasheet(HTML) 22 Page - Microchip Technology

Part No. MCP4922T-EMS
Description  12-Bit DAC with SPI™ Interface
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Maker  MICROCHIP [Microchip Technology]
Homepage  http://www.microchip.com
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MCP4922T-EMS Datasheet(HTML) 22 Page - Microchip Technology

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MCP4921/4922
DS21897A-page 22
 2004 Microchip Technology Inc.
6.4.1.2
Building a “Window” DAC
When calibrating a set point or threshold of a sensor,
rarely does the sensor utilize the entire output range of
the DAC. If the LSB size is adequate to meet the appli-
cation’s accuracy needs, then the resolution is sacri-
ficed without consequences. If greater accuracy is
needed, then the output range will need to be reduced
to increase the resolution around the desired threshold.
If the threshold is not near VREF or AVSS, then creating
a “window” around the threshold has several advan-
tages. One simple method to create this “window” is to
use a voltage divider network with a pull-up and pull-
down
resistor.
Example 6-2
and
Example 6-4
illustrates this concept.
The MCP492X’s low, ±0.75 (max.) DNL performance
is critical to meet calibration accuracy in production.
EXAMPLE 6-2:
Single-Supply “Window” DAC.
VREF
MCP492X
VDD
SPI™
3
Vtrip
R1
R2
0.1 µF
Comparator
R3
VCC-
G = Gain select (1x or 2x)
D = Digital value of DAC (0 – 4096)
VCC+
VCC+
VCC-
VOUT
V
OUT
V
REFG
D
2
12
-------
=
R
23
R
2R3
R
2
R
3
+
------------------
=
V
23
V
CC+R2
()
V
CC-R3
()
+
R
2
R
3
+
------------------------------------------------------
=
V
tr ip
V
OUTR23
V
23R1
+
R
2
R
23
+
--------------------------------------------
=
R1
R23
V23
VOUT
VO
Thevenin
Equivalent
Rsense


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