MCP4726A1T-E/MAY Microchip Technology, MCP4726A1T-E/MAY Datasheet - Page 66

• Manufacturer Part Number: MCP4726A1T-E/MAY
• Description: Single, 12-bit NV DAC With Ext Vref And I2C Interface 6 DFN 2x2x0.9mm T/R
• Manufacturer: Microchip Technology
• Series: -r

Specifications of MCP4726A1T-E/MAY

• Settling Time: 6µs
• Number Of Bits: 12
• Data Interface: EEPROM, I²C, Serial
• Number Of Converters: 1
• Voltage Supply Source: Single Supply
• Power Dissipation (max): 1.10W
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 6-VDFN Exposed Pad
• Number Of Outputs And Type: *
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

MCP4706/4716/4726
8.3.1.2
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 V
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.
6
FIGURE 8-4:
DAC.
EQUATION 8-2:
DS22272A-page 66
2-wire
I
Optional
2
illustrate this concept.
V
C™
V
V
MCP47X6
OUT
TRIP
REF
Thevenin
Equivalent
= V
V
=
DD
REF
V
-------------------------------------------- -
Building a “Window” DAC
OUT
R
V
• G •
R
SENSE
R
OUT
1
23
+
R
+
1
R
V
Single-Supply “Window”
V
CALCULATIONS
DAC Register Value
R
V
23
V
OUT
OUT
23
23
23
R
R
R
=
=
3
2
V
1
REF
AND V
V
CC
------------------ -
R
(
------------------------------------------------------
Figure 8-4
R
V
R
2
CC
2
, 2 • V
CC+
1
–
N
2
+
R
+
V
R
3
R
TRIP
3
R
V
C
TRIP
2
REF
23
2
)
1
+
+
and
Comp.
R
, or V
R
(
23
V
V
3
V
V
CC
CC-
CC
Figure 8-
TRIP
SS
+
–
R
3
then
)
V
O
8.4
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
configuration. R
while R
offset. Note that R4 can be tied to V
if a higher offset is desired.
FIGURE 8-5:
Voltage Source Example Circuit.
EQUATION 8-3:
2-wire
I
Optional
2
C™
V
MCP47X6
REF
V
V
V
OUT
OA+
O
3
= V
Bipolar Operation
and R
V
DD
= V
=
illustrates a simple bipolar voltage source
OA+
V
REF
R
4
1
OUT
V
3
• ( 1 +
and R
shift the DAC's output to a selected
OUT
• G •
+ R
R
• R
3
4
R
Digitally-Controlled Bipolar
V
CALCULATIONS
V
4
2
© 2011 Microchip Technology Inc.
4
IN
OUT
R
R
allow the gain to be selected,
DAC Register Value
2
1
, V
) - V
R
C
OA+
1
V
DD
1
OA+
2
N
DD
, AND V
• (
, instead of V
V
V
R
R
CC
CC
R
2
1
2
–
+
)
O
V
SS
O
,