MCP4725EV Microchip Technology, MCP4725EV Datasheet - Page 31
MCP4725EV
Manufacturer Part Number
MCP4725EV
Description
BOARD EVAL FOR MCP4725
Manufacturer
Microchip Technology
Datasheets
1.MCP4725A1T-ECH.pdf
(50 pages)
2.MCP4725EV.pdf
(32 pages)
3.MCP4725A0T-ECH.pdf
(42 pages)
Specifications of MCP4725EV
Number Of Dac's
1
Number Of Bits
12
Outputs And Type
1, Single Ended
Sampling Rate (per Second)
100k ~ 3.4M
Data Interface
I²C
Settling Time
6µs
Dac Type
Voltage
Voltage Supply Source
Single
Operating Temperature
-40°C ~ 125°C
Utilized Ic / Part
MCP4725
Processor To Be Evaluated
MCP4725
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
8.5.4
Bipolar operation is achievable using the MCP4725 by
using an external operational amplifier (op amp). This
allows a general purpose DAC, with its cost and
availability advantages, to meet almost any desired
output voltage range, power and noise performance.
EXAMPLE 8-3:
© 2007 Microchip Technology Inc.
BIPOLAR OPERATION
1
2
3
V
V
V
0.1 µF
MCP4725
OUT
SS
DD
V
Digitally-Controlled Bipolar Voltage Source.
V
V
OUT
SCL
SDA
IN+
O
A0
=
10 µF
=
=
6
5
4
V
V
V
------------------- -
IN+
R
DD
OUT
3
⎛
⎝
+
1
-------
2
D
R
R
12
+
V
4
4
DD
R
----- -
R
2
1
⎞
⎠
R R
–
V
V
DD
DD
⎛
⎝
R
----- -
R
2
1
⎞
⎠
where D = DAC Input Code (0 – 4095)
V
(MASTER)
OUT
To MCU
Example 8-3
configuration. R
while R
offset. Note that R4 can be tied to V
of V
to V
desired.
R
DD
SS
3
R
, if a higher offset is desired. Note that a pull-up
could be used, instead of R
4
3
V
and R
DD
illustrates a simple bipolar voltage source
1
4
R
and R
shift the DAC's output to a selected
1
0.1 µF
V
IN
+
2
allow the gain to be selected,
V
V
R
CC
CC
2
MCP4725
+
–
4
DD
, if a higher offset is
DS22039C-page 31
V
(= V
O
REF
) instead