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MCP4802-E/MS 数据表(PDF) 29 Page - Microchip Technology

部件名 MCP4802-E/MS
功能描述  8/10/12-Bit Dual Voltage Output Digital-to-Analog Converter with Internal VREF and SPI Interface
PDF  46 Pages
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制造商  MICROCHIP [Microchip Technology]
网页  http://www.microchip.com
标志 MICROCHIP - Microchip Technology

MCP4802-E/MS 数据表(HTML) 29 Page - Microchip Technology

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 2010 Microchip Technology Inc.
DS22249A-page 29
MCP4802/4812/4822
6.7
Selectable Gain and
Offset Bipolar Voltage Output
Using a Dual Output DAC
In some applications, precision digital control of the
output range is desirable. Example 6-4 illustrates how
to use the MCP4802/4812/4822 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
VIN+
VOUTBR4 VCC-R3
+
R3 R4
+
-------------------------------------------------
=
VO
VIN+ 1
R2
R1
------
+

 V
OUTA
R2
R1
------


–
=
Equivalent
V45
VCC+R4 VCC-R5
+
R4 R5
+
---------------------------------------------
=R45
R4R5
R4 R5
+
-------------------
=
VIN+
VOUTBR45 V45R3
+
R3 R45
+
------------------------------------------------
=VO
VIN+ 1
R2
R1
------
+

 V
OUTA
R2
R1
------


–
=
Offset Adjust Gain Adjust
Offset Adjust Gain Adjust
DACB
VOUTA
2.048 GA
Dn
2
N
------

=
VOUTB
2.048 GB
Dn
2
N
------

=
VIN+
Dual Output DAC:
MCP4802
MCP4812
MCP4822
G
= Gain selection (1x or 2x)
N = DAC bit resolution
DA , DB = Digital value of DAC (0-255) for MCP4802
= Digital value of DAC (0-1023) for MCP4812
= Digital value of DAC (0-4095) for MCP4822



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