MCP4822-E/MS Microchip Technology, MCP4822-E/MS Datasheet - Page 20
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MCP4822-E/MS
Manufacturer Part Number
MCP4822-E/MS
Description
IC DAC 12BIT DUAL W/SPI 8MSOP
Manufacturer
Microchip Technology
Specifications of MCP4822-E/MS
Number Of Converters
2
Package / Case
8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
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
Part Number:
MCP4822-E/MS
Manufacturer:
MICROCHIP/微芯
Quantity:
20 000
MCP4821/MCP4822
6.5
The MCP482X devices are Rail-to-Rail (R-R) input and
output DACs designed to operate with a V
2.7V to 5.5V. Its output amplifier is robust enough to
drive common, small-signal loads directly, thus eliminat-
ing the cost and size of an external buffer for most
applications.
6.5.1
A common application for a DAC with the MCP482X
family’s performance is a digitally-controlled set point
and/or calibration of variable parameters, such as sen-
sor offset or slope. 12-bit resolution provides 4096 out-
put steps. If G = 1 is selected, then the internal 2.048
V
selected, the internal 2.048 V
of resolution.
EXAMPLE 6-1:
DS21953A-page 20
REF
would produce 500 µV of resolution. If G = 2 is
SPI™
Single-Supply Operation
DC SET POINT OR CALIBRATION
3
MCP482X
V
DD
Set Point or Threshold Calibration.
V OUT
V trip
REF
V
would produce 1 mV
=
OUT
=
2.048 G
V OUT
R
DD
⎛
⎜
⎝
1
--------------------
R 1
-------- -
2
range of
D
12
R 2
+
R
2
R 2
⎞
⎟
⎠
R
SENSE
V
DD
6.5.1.1
If the application is calibrating the threshold of a diode,
transistor or resistor tied to AV
0.8V may be desired to provide 200 µV resolution. Two
common methods to achieve a 0.8V range is to either
reduce V
and external voltage reference) or use a voltage divider
on the DAC’s output. Typically, when using a low-
voltage V
intolerable. The voltage divider method provides some
advantages when V
the desired output voltage is not available. Using two
resistors to scale the output range down to the precise
desired level is a simple, low-cost method to achieve
very small step sizes. Example 6-1 illustrates this
concept. Note that the bypass capacitor on the output
of the voltage divider plays a critical function in
attenuating the output noise of the DAC and the
induced noise from the environment.
The MCP482X family’s low ±0.75 (max.) DNL
performance is critical to meeting calibration accuracy
in production.
0.1 uF
REF
REF
G = Gain select (1x or 2x)
D = Digital value of DAC (0 – 4096)
, the noise floor causes SNR error that is
to 0.82V (would require MCP492X device
V
Decreasing The Output Step Size
TRIP
REF
Comparator
© 2005 Microchip Technology Inc.
needs to be very low or when
V
V
CC
CC
+
–
SS
, a threshold range of