MCP4922-E/P Microchip Technology, MCP4922-E/P Datasheet - Page 29
![IC DAC 12BIT DUAL W/SPI 14DIP](/photos/6/59/65935/150-14-dip_sml.jpg)
MCP4922-E/P
Manufacturer Part Number
MCP4922-E/P
Description
IC DAC 12BIT DUAL W/SPI 14DIP
Manufacturer
Microchip Technology
Specifications of MCP4922-E/P
Number Of Converters
2
Package / Case
14-DIP (0.300", 7.62mm)
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
Through Hole
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
Through Hole
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:
MCP4922-E/P
Manufacturer:
MICROCHIP
Quantity:
1 000
Part Number:
MCP4922-E/P
Manufacturer:
MICROCH
Quantity:
20 000
6.4.1.2
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:
D
V OUT
G = Gain selection (1x or 2x)
N = DAC Bit Resolution
Thevenin
Equivalent
n
= Digital value of DAC (0-4095) for MCP4921/MCP4922
= Digital value of DAC (0-255) for MCP4901/MCP4902
= Digital value of DAC (0-1023) for MCP4911/MCP4912
=
Building a “Window” DAC
V
REF
SPI
V
REF
G
MCP4902
MCP4912
MCP4922
MCP4921
MCP4901
MCP4911
SINGLE-SUPPLY “WINDOW” DAC
R
V
V
3
23
23
trip
D
------
2
N
n
=
=
V
=
------------------
R
---------------------------------------------------- -
DD
DAC
V
R
V
------------------------------------------- -
2
CC+
2
OUT
+
R
R
3
R
R
3
R
R
2
2
2
23
+
+
+
+
R
V
R
23
V
OUT
V
3
23
CC-
R
R
1
3
R
1
R
R
3
2
V
V
CC+
CC-
V
OUT
If the threshold is not near V
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 6-4
R
sense
MCP4902/4912/4922
R
1
V
23
illustrate this concept.
R
0.1 µF
V
23
V
trip
O
REF
Comparator
or V
V
V
CC+
CC-
Example 6-2
DS22250A-page 29
SS
, then creating
and