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MCP4902-E/ST 数据表(PDF) 31 Page - Microchip Technology

部件名 MCP4902-E/ST
功能描述  8/10/12-Bit Dual Voltage Output Digital-to-Analog Converter with SPI Interface
PDF  48 Pages
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制造商  MICROCHIP [Microchip Technology]
网页  http://www.microchip.com
标志 MICROCHIP - Microchip Technology

MCP4902-E/ST 数据表(HTML) 31 Page - Microchip Technology

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 2010 Microchip Technology Inc.
DS22250A-page 31
MCP4902/4912/4922
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 MCP4902/4912/4922 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
DACB
VDD
R3
R4
R2
DACA
VDD
R1
DACA (Gain Adjust)
DACB (Offset Adjust)
SPI
3
R5
VCC+
Thevenin
Bipolar “Window” DAC using R4 and R5
0.1uF
VCC–
VCC+
VCC–
VOUTB
VREFBGB

DB
2
N
-------
=
VOUTA
VOUTB
VOUTA
VREFAGA

DA
2
N
-------
=
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
VREFB
GX = Gain selection (1x or 2x)
DA, DB = Digital value of DAC (0-255) for MCP4902
= Digital value of DAC (0-1023) for MCP4912
= Digital value of DAC (0-4095) for MCP4922
N = DAC Bit Resolution
VO
Dual Output DAC:
MCP4902
MCP4912
MCP4922



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