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MCP4802-E/MS 数据表(PDF) 27 Page - Microchip Technology

部件名 MCP4802-E/MS
功能描述  8/10/12-Bit Dual Voltage Output Digital-to-Analog Converter with Internal VREF and SPI Interface
PDF  46 Pages
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制造商  MICROCHIP [Microchip Technology]
网页  http://www.microchip.com
标志 MICROCHIP - Microchip Technology

MCP4802-E/MS 数据表(HTML) 27 Page - Microchip Technology

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 2010 Microchip Technology Inc.
DS22249A-page 27
MCP4802/4812/4822
6.5.1.2
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, 2VREF 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 shows this
concept.
EXAMPLE 6-2:
SINGLE-SUPPLY “WINDOW” DAC
DAC
VDD
SPI
3-wire
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
+
R1 R23
+
---------------------------------------------
=
R1
R23
V23
VOUT
VO
Thevenin
Equivalent
RSENSE
VOUT
2.048 G
Dn
2
N
------

=
(a) Single Output DAC:
MCP4801
MCP4811
MCP4821
(b) Dual Output DAC:
MCP4802
MCP4812
MCP4822
G
= Gain selection (1x or 2x)
Dn = Digital value of DAC (0-255) for MCP4801/MCP4802
= Digital value of DAC (0-1023) for MCP4811/MCP4812
= Digital value of DAC (0-4095) for MCP4821/MCP4822
N
= DAC bit resolution



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