MCP4902-E/SL Microchip Technology, MCP4902-E/SL Datasheet - Page 29
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MCP4902-E/SL
Manufacturer Part Number
MCP4902-E/SL
Description
DAC 8BIT DUAL W/SPI 14SOIC
Manufacturer
Microchip Technology
Datasheet
1.MCP4922-EP.pdf
(48 pages)
Specifications of MCP4902-E/SL
Number Of Converters
2
Settling Time
4.5µs
Package / Case
14-SOIC (3.9mm Width), 14-SOL
Number Of Bits
8
Data Interface
Serial, SPI™
Voltage Supply Source
Single Supply
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Number Of Dac Outputs
2
Resolution
8 bit
Interface Type
SPI
Supply Voltage (max)
6.5 V
Supply Voltage (min)
2.7 V
Maximum Operating Temperature
+ 125 C
Mounting Style
SMD/SMT
Minimum Operating Temperature
- 55 C
Supply Current
350 uA
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:
MCP4902-E/SL
Manufacturer:
Holtek
Quantity:
96
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