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MCP4922-ESL Datasheet(PDF) 24 Page - Microchip Technology

Part No. MCP4922-ESL
Description  12-Bit DAC with SPI™ Interface
Download  40 Pages
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Maker  MICROCHIP [Microchip Technology]
Homepage  http://www.microchip.com
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 24 page
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MCP4921/4922
DS21897A-page 24
 2004 Microchip Technology Inc.
6.6
Selectable Gain and Offset Bipolar
Voltage Output Using A Dual DAC
In some applications, precision digital control of the
output range is desirable. Example 6-4 illustrates how
to use the MCP4922 to achieve this in a bipolar or
single-supply application.
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 R3, R4 and R5 are populated.
EXAMPLE 6-4:
Bipolar Voltage Source With Selectable Gain and Offset.
VREFA
MCP492X
VDD
R3
R4
R2
VO
MCP492X
VDD
R1
DACA (Gain Adjust)
DACB (Offset Adjust)
SPI™
3
R5
VCC+
Thevenin
Bipolar “Window” DAC using R4 and R5
G = Gain select (1x or 2x)
D = Digital value of DAC (0 – 4096)
0.1uF
VCC
AVSS = GND
VCC+
VCC
V
OUTB
V
REFBGB
()
D
B
2
12
-------
=
VOUTA
VOUTB
V
OUTA
V
REFA GA
()
D
A
2
12
-------
=
V
IN+
V
OUTBR4
V
CC-R3
+
R
3
R
4
+
------------------------------------------------
=
V
O
V
IN+ 1
R
2
R
1
------
+


V
OUTA
R
2
R
1
------


=
Equivalent
V
45
V
CC+R4
V
CC-R5
+
R
4
R
5
+
--------------------------------------------
=
R
45
R
4R5
R
4
R
5
+
------------------
=
V
IN+
V
OUTBR45
V
45R3
+
R
3
R
45
+
-----------------------------------------------
=
V
O
V
IN+ 1
R
2
R
1
------
+


V
OUTA
R
2
R
1
------


=
Offset Adjust Gain Adjust
Offset Adjust Gain Adjust
VREFB




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