MCP4821-E/SN Microchip Technology, MCP4821-E/SN Datasheet - Page 27
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MCP4821-E/SN
Manufacturer Part Number
MCP4821-E/SN
Description
IC DAC 12BIT W/SPI 8SOIC
Manufacturer
Microchip Technology
Specifications of MCP4821-E/SN
Number Of Converters
1
Package / Case
8-SOIC (3.9mm Width)
Settling Time
4.5µs
Number Of Bits
12
Data Interface
Serial, SPI™
Voltage Supply Source
Single Supply
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Resolution
12 bit
Interface Type
Serial (3-Wire, SPI, Microwire)
Supply Voltage (max)
5.5 V
Supply Voltage (min)
2.7 V
Maximum Operating Temperature
+ 125 C
Mounting Style
SMD/SMT
Minimum Operating Temperature
- 40 C
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:
MCP4821-E/SN
Manufacturer:
SAMSUNG
Quantity:
3 440
Part Number:
MCP4821-E/SN
Manufacturer:
MICROCHIP/微芯
Quantity:
20 000
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