MCP4902-E/P Microchip Technology, MCP4902-E/P Datasheet - Page 31
![no-image](/images/manufacturer_photos/0/4/439/microchip_technology_sml.jpg)
MCP4902-E/P
Manufacturer Part Number
MCP4902-E/P
Description
DAC 8BIT DUAL W/SPI 14PDIP
Manufacturer
Microchip Technology
Datasheet
1.MCP4922-EP.pdf
(48 pages)
Specifications of MCP4902-E/P
Number Of Converters
2
Settling Time
4.5µs
Package / Case
14-DIP (0.300", 7.62mm)
Number Of Bits
8
Data Interface
Serial, SPI™
Voltage Supply Source
Single Supply
Operating Temperature
-40°C ~ 125°C
Mounting Type
Through Hole
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
Through Hole
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/P
Manufacturer:
MICROCHIP
Quantity:
1 000
6.6
In some applications, precision digital control of the
output range is desirable.
to use the MCP4902/4912/4922 to achieve this in a
bipolar or single-supply application.
EXAMPLE 6-4:
2010 Microchip Technology Inc.
Dual Output DAC:
Thevenin
Equivalent
V
V
V
V
IN+
O
OUTB
OUTA
Selectable Gain and Offset Bipolar
Voltage Output Using a Dual DAC
=
=
Offset Adjust Gain Adjust
V
MCP4902
MCP4912
MCP4922
V
----------------------------------------------- -
IN+
=
=
OUTB
V
V
1
REFB
REFA
V
R
+
R
V
IN+
3
R
----- -
R
4
45
+
SPI
2
1
V
BIPOLAR VOLTAGE SOURCE WITH SELECTABLE GAIN AND OFFSET
+
V
G
G
R
REFB
=
=
REFA
V
B
–
4
A
CC-
V
---------------------------------------------- -
Example 6-4
V
V
------------------------------------------- -
D
------ -
D
------ -
2
2
OUTB
OUTA
CC+
N
N
B
A
R
3
3
V
V
R
R
R
DAC
DAC
DD
DD
4
3
4
R
R
----- -
R
+
+
45
+
2
1
R
R
V
+
A
B
Bipolar “Window” DAC using R
5
45
CC-
DAC
DAC
V
illustrates how
45
R
R
5
A
B
3
V
V
OUTA
(Gain Adjust)
OUTB
(Offset Adjust)
D
R
A
V
45
, D
O
R
R
G
1
3
N = DAC Bit Resolution
=
=
B
X
Offset Adjust Gain Adjust
= Digital value of DAC (0-255) for MCP4902
= Digital value of DAC (0-4095) for MCP4922
= Digital value of DAC (0-1023) for MCP4912
------------------
R
V
= Gain selection (1x or 2x)
R
4
IN+
4
+
R
V
V
R
5
1
This circuit is typically used in Multiplier mode and is
ideal for linearizing a sensor whose slope and offset
varies. Refer to Section 6.9 “Using Multiplier Mode”
for more information on Multiplier mode.
The equation to design a bipolar “window” DAC would
be utilized if R
CC
CC
5
+
MCP4902/4912/4922
R
+
R
–
R
----- -
R
4
5
2
1
–
0.1uF
4
V
and R
OUTA
3
, R
5
R
----- -
R
4
2
1
and R
V
V
CC
R
CC
2
+
–
5
are populated.
DS22250A-page 31
V
O