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MCP4821 bảng dữ liệu(PDF) 29 Page - Microchip Technology

tên linh kiện MCP4821
Giải thích chi tiết về linh kiện  8/10/12-Bit Voltage Output Digital-to-Analog Converter with Internal VREF and SPI Interface
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 2010 Microchip Technology Inc.
DS22244B-page 29
MCP4801/4811/4821
6.7
Selectable Gain and Offset Bipolar
Voltage Output
In some applications, precision digital control of the
output range is desirable. Example 6-4 illustrates how
to use the MCP4801/4811/4821 family of devices to
achieve this in a bipolar or single-supply application.
This circuit is typically used for linearizing a sensor
whose slope and offset varies.
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
VDD
R3
R4
R2
VO
DACA
VDD
R1
(DACA for Gain Adjust)
(DACB for Offset Adjust)
SPI
3
R5
VCC+
Thevenin
Bipolar “Window” DAC using R4 and R5
0.1 µF
VCC–
VCC+
VCC–
VOUTA
VOUTB
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
DACB
V
OUTA
2.048 G
A
D
n
2
N
------

=
V
OUTB
2.048 G
B
D
n
2
N
------

=
VIN+
G
=
Gain selection (1x or 2x)
N
=
DAC bit resolution
Dn = Digital value of DAC (0-255) for MCP4801
=
Digital value of DAC (0-1023) for MCP4811
=
Digital value of DAC (0-4095) for MCP4821



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