MCP4725DM-PTPLS Microchip Technology, MCP4725DM-PTPLS Datasheet - Page 37

• Manufacturer Part Number: MCP4725DM-PTPLS
• Description: BOARD DAUGHTER PICTAIL MCP4725
• Manufacturer: Microchip Technology

Specifications of MCP4725DM-PTPLS

• 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
• Silicon Manufacturer: Microchip
• Application Sub Type: DAC
• Kit Application Type: Data Converter
• Silicon Core Number: MCP4725
• Silicon Family Name: PICtail
• 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:
© 2009 Microchip Technology Inc.
BIPOLAR OPERATION
1
2
3
V
V
V
MCP4725
0.1 µF
OUT
SS
DD
Digitally-Controlled Bipolar Voltage Source.
V
V
V
SCL
SDA
IN+
O
OUT
A0
=
10 µF
=
6
5
4
V
=
IN+
V
------------------- -
R
V
OUT
3
DD
⎛
⎝
+
1
R
R
+
V
×
4
4
DD
-------
2
Dn
R
----- -
R
12
2
1
⎞
⎠
R R
–
V
V
DD
DD
Where: Dn = DAC Input Code (0 – 4095)
⎛
⎝
R
----- -
R
2
1
⎞
⎠
V
(MASTER)
OUT
To MCU
Example 8-3
configuration. R
while R
offset. Note that R
of V
to V
desired.
DD
SS
R
, if a higher offset is desired. Note that a pull-up
could be used, instead of R
3
3
R
and R
4
V
DD
illustrates a simple bipolar voltage source
1
4
and R
shift the DAC's output to a selected
4
R
can be tied to V
1
0.1 µF
V
2
IN
allow the gain to be selected,
+
V
V
R
CC
MCP4725
CC
2
+
–
4
DD
, if a higher offset is
DS22039D-page 37
(= V
V
O
REF
) instead