參數(shù)資料
型號(hào)： ADM00317
廠商： Microchip Technology
文件頁(yè)數(shù)： 63/86頁(yè)
文件大小： 0K
描述： BOARD DAUGHTER MCP4706/16/26
標(biāo)準(zhǔn)包裝： 1
DAC 的數(shù)量： 3 個(gè)，每 IC 1 個(gè)
位數(shù)： 8，10，12
設(shè)置時(shí)間： 6µs
DAC 型： 電壓
已供物品： 子板
已用 IC / 零件： MCP4706，MCP4716，MCP4726
MCP4706/4716/4726
DS22272C-page 66
2011-2012 Microchip Technology Inc.
8.3.1.2
Building a “Window” DAC
When calibrating a set point or threshold of a sensor,
typically only a small portion of the DAC output range is
utilized. If the LSb size is adequate enough to meet the
application’s accuracy needs, the unused range is
sacrificed without consequences. If greater accuracy is
needed, then the output range will need to be reduced
to increase the resolution around the desired threshold.
If the threshold is not near VREF, 2 VREF, or VSS, then
creating a “window” around the threshold has several
advantages. One simple method to create this “window”
is to use a voltage divider network with a pull-up and
pull-down resistor. Figure 8-4 and Figure 8-6 illustrate
this concept.
FIGURE 8-4:
Single-Supply “Window”
DAC.
EQUATION 8-2:
VOUT AND VTRIP
CALCULATIONS
8.4
Bipolar Operation
Bipolar operation is achievable by utilizing an external
operational amplifier. This configuration is desirable
due to the wide variety and availability of op amps. This
allows a general purpose DAC, with its cost and
availability advantages, to meet almost any desired
output voltage range, power and noise performance.
Figure 8-5 illustrates a simple bipolar voltage source
configuration. R1 and R2 allow the gain to be selected,
while R3 and R4 shift the DAC's output to a selected
offset. Note that R4 can be tied to VDD, instead of VSS,
if a higher offset is desired.
FIGURE 8-5:
Digitally-Controlled Bipolar
Voltage Source Example Circuit.
EQUATION 8-3:
VOUT, VOA+, AND VO
CALCULATIONS
R1
VCC+
VCC–
VO
I2C
2-wire
VREF
Optional
MCP47X6
VDD
VOUT
R2
C1
R3
VCC+
VCC–
RSENSE
Comp.
VTRIP
R
23
R
2R3
R
2
R
3
+
-------------------
=
V
23
V
CC+R2
()
V
CC-R3
()
+
R
2
R
3
+
------------------------------------------------------
=
V
TRIP
V
OUTR23
V
23R1
+
R
1
R
23
+
---------------------------------------------
=
Thevenin
Equivalent
R1
R23
V23
VOUT
VTRIP
VOUT = VREF G
DAC Register Value
2N
R3
VCC+
VCC–
VO
I2C
2-wire
VREF
Optional
MCP47X6
VDD
R2
VOUT
VIN
R1
R4
C1
VOA+
VOA+ =
VOUT R4
R3 + R4
VOUT = VREF G
DAC Register Value
2N
VO = VOA+ ( 1 +
) - VDD (
)
R2
R1
R2
R1
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