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MCP4822-E/MS датащи(PDF) 21 Page - Microchip Technology

номер детали MCP4822-E/MS
подробное описание детали  12-Bit DACs with Internal VREF and SPI??Interface
PDF  36 Pages
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производитель  MICROCHIP [Microchip Technology]
домашняя страница  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MCP4822-E/MS датащи(HTML) 21 Page - Microchip Technology

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© 2005 Microchip Technology Inc.
DS21953A-page 21
MCP4821/MCP4822
6.5.1.2
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, the resolution is sacrificed
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, 2VREF or AVSS, then
creating a “window” around the threshold has several
advantages. 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
MCP482X
family’s
low
±0.75
(max.)
DNL
performance is critical to meet calibration accuracy in
production.
EXAMPLE 6-2:
Single-Supply “Window” DAC.
MCP482X
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
2.048 G
D
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



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