MCP4811T-E/MC Microchip Technology, MCP4811T-E/MC Datasheet - Page 27
![no-image](/images/manufacturer_photos/0/4/439/microchip_technology_sml.jpg)
MCP4811T-E/MC
Manufacturer Part Number
MCP4811T-E/MC
Description
Single 10-bit DAC With SPI Interace And Internal Vref 8 DFN 2x3mm T/R
Manufacturer
Microchip Technology
Datasheet
1.MCP4821-EMS.pdf
(48 pages)
Specifications of MCP4811T-E/MC
Settling Time
4.5µs
Number Of Bits
10
Data Interface
Serial, SPI™
Number Of Converters
1
Voltage Supply Source
Single Supply
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
8-DFN
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Power Dissipation (max)
-
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
MCP4811T-E/MC
Manufacturer:
MICROCHIP
Quantity:
12 000
6.5.1.2
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.
EXAMPLE 6-2:
2010 Microchip Technology Inc.
(a) Single Output DAC:
(b) Dual Output DAC:
V OUT
D
Thevenin
Equivalent
G
N
n
=
=
=
=
=
=
2.048 G
Gain selection (1x or 2x)
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
DAC bit resolution
Building a “Window” DAC
MCP4801
MCP4811
MCP4821
MCP4802
MCP4812
MCP4822
SPI
SINGLE-SUPPLY “WINDOW” DAC
R
V
V
D
------
2
23
23
trip
N
n
=
=
3-wire
=
------------------ -
R
------------------------------------------------------
V
R
V
-------------------------------------------- -
2
V
CC+
OUT
2
+
DD
R
DAC
R
3
R
R
3
R
R
1
2
2
23
+
+
+
+
R
R
23
V
V
3
23
V
CC-
OUT
R
1
R
3
R
1
R
R
2
3
V
V
CC+
V
CC-
OUT
If the threshold is not near V
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
Example 6-4
MCP4801/4811/4821
R
SENSE
R
and
1
V
23
pull-down
illustrate this concept.
R
23
V
0.1 µF
O
V
TRIP
resistor.
REF
, 2V
Comparator
Example 6-2
DS22244B-page 27
REF
V
V
CC+
CC-
or V
SS
, then
and