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MCP4902-E/ST 数据表(PDF) 29 Page - Microchip Technology

部件名 MCP4902-E/ST
功能描述  8/10/12-Bit Dual Voltage Output Digital-to-Analog Converter with SPI Interface
PDF  48 Pages
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制造商  MICROCHIP [Microchip Technology]
网页  http://www.microchip.com
标志 MICROCHIP - Microchip Technology

MCP4902-E/ST 数据表(HTML) 29 Page - Microchip Technology

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 2010 Microchip Technology Inc.
DS22250A-page 29
MCP4902/4912/4922
6.4.1.2
Building a “Window” DAC
When calibrating a set point or threshold of a sensor,
typically only a small portion of the DAC output range is
utilized. If the LSb size is adequate enough to meet the
application’s accuracy needs, the unused range 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 or VSS, 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 illustrate this concept.
EXAMPLE 6-2:
SINGLE-SUPPLY “WINDOW” DAC
VREF
VDD
SPI
3
Vtrip
R1
R2
0.1 µF
Comparator
R3
VCC-
VCC+
VCC+
VCC-
VOUT
R23
R2R3
R2 R3
+
------------------
=
V23
VCC+R2

VCC-R3

+
R2 R3
+
-----------------------------------------------------
=
Vtrip
VOUTR23 V23R1
+
R2 R23
+
--------------------------------------------
=
R1
R23
V23
VOUT
VO
Thevenin
Equivalent
Rsense
G = Gain selection (1x or 2x)
Dn = Digital value of DAC (0-255) for MCP4901/MCP4902
VOUT
VREF G
Dn
2
N
------

=
= Digital value of DAC (0-1023) for MCP4911/MCP4912
= Digital value of DAC (0-4095) for MCP4921/MCP4922
N = DAC Bit Resolution
DAC
MCP4901
MCP4911
MCP4921
(a) Single Output DAC:
(b) Dual Output DAC:
MCP4902
MCP4912
MCP4922



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